Use pg10 as base image and python3 instead of 2

docs/SETTINGS.rst

@@ -33,11 +33,6 @@ Bootstrap configuration
         -  **restore\_command**: command to restore WAL records from the remote master to standby leader, can be different from the list defined in :ref:`postgresql_settings`
         -  **archive\_cleanup\_command**: cleanup command for standby leader
         -  **recovery\_min\_apply\_delay**: how long to wait before actually apply WAL records on a standby leader
-    -  **slots**: define permanent replication slots. These slots will be preserved during switchover/failover. Patroni will try to create slots before opening connections to the cluster.
-        -  **my_slot_name**: the name of replication slot. It is the responsibility of the operator to make sure that there are no clashes in names between replication slots automatically created by Patroni for members and permanent replication slots.
-            -  **type**: slot type. Could be ``physical`` or ``logical``. If the slot is logical, you have to additionally define ``database`` and ``plugin``.
-               **database**: the database name where logical slots should be created.
-               **plugin**: the plugin name for the logical slot.
 -  **method**: custom script to use for bootstrapping this cluster.
    See :ref:`custom bootstrap methods documentation <custom_bootstrap>` for details.
    When ``initdb`` is specified revert to the default ``initdb`` command. ``initdb`` is also triggered when no ``method``
@@ -159,8 +154,6 @@ REST API
         -  **certfile**: Specifies the file with the certificate in the PEM format. If the certfile is not specified or is left empty, the API server will work without SSL.
         -  **keyfile**: Specifies the file with the secret key in the PEM format.
 
-.. _patronictl_settings:
-
 CTL
 ---
 -  **Optional**:

docs/releases.rst

@@ -3,79 +3,6 @@
 Release notes
 =============
 
-Version 1.5.1
--------------
-
-This version implements support of permanent replication slots, adds support of pgBackRest and fixes number of bugs.
-
-**New features**
-
-- Permanent replication slots (Alexander Kukushkin)
-
-  Permanent replication slots are preserved on failover/switchover, that is, Patroni on the new primary will create configured replication slots right after doing promote. Slots could be configured with the help of `patronictl edit-config`. The initial configuration could be also done in the :ref:`bootstrap.dcs <settings>`.
-
-- Add pgbackrest support (Yogesh Sharma)
-
-  pgBackrest can restore in existing $PGDATA folder, this allows speedy restore as files which have not changed since last backup are skipped, to support this feature new parameter `keep_data` has been introduced. See :ref:`replica creation method <custom_replica_creation>` section for additional examples.
-
-**Bug fixes**
-
-- A few bugfixes in the "standby cluster" workflow (Alexander)
-
-  Please see https://github.com/zalando/patroni/pull/823 for more details.
-
-- Fix REST API health check when cluster management is paused and DCS is not accessible (Alexander)
-
-  Regression was introduced in https://github.com/zalando/patroni/commit/90cf930036a9d5249265af15d2b787ec7517cf57
-
-Version 1.5.0
--------------
-
-This version enables Patroni HA cluster to operate in a standby mode, introduces experimental support for running on Windows, and provides a new configuration parameter to register PostgreSQL service in Consul.
-
-**New features**
-
-- Standby cluster (Dmitry Dolgov)
-
-  One or more Patroni nodes can form a standby cluster that runs alongside the primary one (i.e. in another datacenter) and consists of standby nodes that replicate from the master in the primary cluster. All PostgreSQL nodes in the standby cluster are replicas; one of those replicas elects itself to replicate directly from the remote master, while the others replicate from it in a cascading manner. More detailed description of this feature and some configuration examples can be found at :ref:`here <standby_cluster>`.
-
-- Register Services in Consul (Pavel Kirillov, Alexander Kukushkin)
-
-  If `register_service` parameter in the consul :ref:`configuration <consul_settings>` is enabled, the node will register a service with the name `scope` and the tag `master`, `replica` or `standby-leader`.
-
-- Experimental Windows support (Pavel Golub)
-
-  From now on it is possible to run Patroni on Windows, although Windows support is brand-new and hasn't received as much real-world testing as its Linux counterpart. We welcome your feedback!
-
-**Improvements in patronictl**
-
-- Add patronictl -k/--insecure flag and support for restapi cert (Wilfried Roset)
-
-  In the past if the REST API was protected by the self-signed certificates `patronictl` would fail to verify them. There was no way to  disable that verification. It is now possible to configure `patronictl` to skip the certificate verification altogether or provide CA and client certificates in the :ref:`ctl: <patronictl_settings>` section of configuration.
-
-- Exclude members with nofailover tag from patronictl switchover/failover output (Alexander Anikin)
-
-  Previously, those members were incorrectly proposed as candidates when performing interactive switchover or failover via patronictl.
-
-**Stability improvements**
-
-- Avoid parsing non-key-value output lines of pg_controldata (Alexander Anikin)
-
-  Under certain circuimstances pg_controldata outputs lines without a colon character. That would trigger an error in Patroni code that parsed pg_controldata output, hiding the actual problem; often such lines are emitted in a warning shown by pg_controldata before the regular output, i.e. when the binary major version does not match the one of the PostgreSQL data directory.
-
-- Add member name to the error message during the leader election (Jan Mussler)
-
-  During the leader election, Patroni connects to all known members of the cluster and requests their status. Such status is written to the Patroni log and includes the name of the member. Previously, if the member was not accessible, the error message did not indicate its name, containing only the URL.
-
-- Immediately reserve the WAL position upon creation of the replication slot (Alexander Kukushkin)
-
-  Starting from 9.6, `pg_create_physical_replication_slot` function provides an additional boolean parameter `immediately_reserve`. When it is set to `false`, which is also the default, the slot doesn't reserve the WAL position until it receives the first client connection, potentially losing some segments required by the client in a time window between the slot creation and the intiial client connection.
-
-- Fix bug in strict synchronous replication (Alexander Kukushkin)
-
-  When running with `synchronous_mode_strict: true`, in some cases Patroni puts `*` into the `synchronous_standby_names`, changing the sync state for most of the replication connections to `potential`. Previously, Patroni couldn't pick a synchronous candidate under such curcuimstances, as it only considered those with the state `async`.
-
-
 Version 1.4.6
 -------------
 
@@ -324,8 +251,8 @@ In addition to using Endpoints, Patroni supports ConfigMaps. You can find more i
 
 - Minimize the amount of SELECT's issued by Patroni on every loop of HA cylce (Alexander Kukushkin)
 
-  On every iteration of HA loop Patroni needs to know recovery status and absolute wal position. From now on Patroni will run only single SELECT to get this information instead of two on the replica and three on the master.
-
+  On every iteration of HA loop Patroni needs to know recovery status and absolute wal position. From now on Patroni will run only single SELECT to get this information instead of two on the replica and three on the master. 
+  
 - Remove leader key on shutdown only when we have the lock (Ants)
 
   Unconditional removal was generating unnecessary and missleading exceptions.
@@ -335,7 +262,7 @@ In addition to using Endpoints, Patroni supports ConfigMaps. You can find more i
 - Add version command to patronictl (Ants)
 
   It will show the version of installed Patroni and versions of running Patroni instances (if the cluster name is specified).
-
+  
 - Make optional specifying cluster_name argument for some of patronictl commands (Alexander, Ants)
 
   It will work if patronictl is using usual Patroni configuration file with the ``scope`` defined.
@@ -343,11 +270,11 @@ In addition to using Endpoints, Patroni supports ConfigMaps. You can find more i
 - Show information about scheduled switchover and maintenance mode (Alexander)
 
   Before that it was possible to get this information only from Patroni logs or directly from DCS.
-
+  
 - Improve ``patronictl reinit`` (Alexander)
 
   Sometimes ``patronictl reinit`` refused to proceed when Patroni was busy with other actions, namely trying to start postgres. `patronictl` didn't provide any commands to cancel such long running actions and the only (dangerous) workarond was removing a data directory manually. The new implementation of `reinit` forcefully cancells other long-running actions before proceeding with reinit.
-
+  
 - Implement ``--wait`` flag in ``patronictl pause`` and ``patronictl resume`` (Alexander)
 
   It will make ``patronictl`` wait until the requested action is acknowledged by all nodes in the cluster.
@@ -394,7 +321,7 @@ Version 1.3.6
   After a crash that doesn't clean up postmaster.pid there could be a new process with the same pid, resulting in a false positive for is_running(), which will lead to all kinds of bad behavior.
 
 - Shutdown postgresql before bootstrap when we lost data directory (ainlolcat)
-
+  
   When data directory on the master is forcefully removed, postgres process can still stay alive for some time and prevent the replica created in place of that former master from starting or replicating.
   The fix makes Patroni cache the postmaster pid and its start time and let it terminate the old postmaster in case it is still running after the corresponding data directory has been removed.
 
@@ -464,7 +391,7 @@ Version 1.3.4
 - Pass the consul token as a header (Andrew Colin Kissa)
 
   Headers are now the prefered way to pass the token to the consul `API <https://www.consul.io/api/index.html#authentication>`__.
-
+  
 
 - Advanced configuration for Consul (Alexander Kukushkin)
 

docs/replica_bootstrap.rst

@@ -65,19 +65,6 @@ for outdated backup files. Some people prefer other backup solutions, such as ``
 others, or simply roll their own scripts. In order to accommodate all those use-cases Patroni supports running custom
 scripts to clone a new replica. Those are configured in the ``postgresql`` configuration block:
 
-.. code:: YAML
-
-    postgresql:
-        create_replica_methods:
-            - <method name>
-        <method name>:
-            command: <command name>
-            keep_data: True
-            no_params: True
-            no_master: 1
-
-example: wal_e
-
 .. code:: YAML
 
     postgresql:
@@ -92,21 +79,6 @@ example: wal_e
         basebackup:
             max-rate: '100M'
 
-example: pgbackrest
-
-.. code:: YAML
-
-    postgresql:
-        create_replica_methods:
-            - pgbackrest
-            - basebackup
-        pgbackrest:
-            command: /usr/bin/pgbackrest --stanza=mydb --deltarestore
-            keep_data: True
-            no_params: True
-        basebackup:
-            max-rate: '100M'
-
 
 The ``create_replica_methods`` defines available replica creation methods and the order of executing them. Patroni will
 stop on the first one that returns 0. Each method should define a separate section in the configuration file, listing the command
@@ -127,10 +99,6 @@ A special ``no_master`` parameter, if defined, allows Patroni to call the replic
 running master or replicas. In that case, an empty string will be passed in a connection string. This is useful for
 restoring the formerly running cluster from the binary backup.
 
-A special ``keep_data`` parameter, if defined, will instuct Patroni to  not clean PGDATA folder before calling restore.
-
-A special ``no_params`` parameter, if defined, restricts passing parameters to custom command.
-
 A ``basebackup`` method is a special case: it will be used if
 ``create_replica_methods`` is empty, although it is possible
 to list it explicitly among the ``create_replica_methods`` methods. This method initializes a new replica with the
@@ -162,8 +130,6 @@ and
 
 If all replica creation methods fail, Patroni will try again all methods in order during the next event loop cycle.
 
-.. _standby_cluster:
-
 Standby cluster
 ---------------
 

extras/startup-scripts/patroni.service

@@ -18,14 +18,8 @@ WorkingDirectory=~
 
 # Where to send early-startup messages from the server
 # This is normally controlled by the global default set by systemd
-#StandardOutput=syslog
+# StandardOutput=syslog
 
-# Pre-commands to start watchdog device
-# Uncomment if watchdog is part of your patroni setup
-#ExecStartPre=-/usr/bin/sudo /sbin/modprobe softdog
-#ExecStartPre=-/usr/bin/sudo /bin/chown postgres /dev/watchdog
-
-# Start the patroni process
 ExecStart=/bin/patroni /etc/patroni.yml
 
 # Send HUP to reload from patroni.yml

features/callback.sh

@@ -1,5 +0,0 @@
-#!/bin/bash
-
-[[ "$3" == "master" ]] || exit
-
-PGPASSWORD=zalando psql -h localhost -U postgres -p $1 -w -tAc "SELECT slot_name FROM pg_replication_slots WHERE slot_type = 'logical'" >> data/postgres0/label

features/environment.py

@@ -182,9 +182,6 @@ class PatroniController(AbstractController):
                         dst[k] = v
             recursive_update(config, custom_config)
 
-        if config['postgresql'].get('callbacks', {}).get('on_role_change'):
-            config['postgresql']['callbacks']['on_role_change'] += ' ' + str(self.__PORT)
-
         with open(patroni_config_path, 'w') as f:
             yaml.safe_dump(config, f, default_flow_style=False)
 

features/standby_cluster.feature

@@ -1,25 +1,11 @@
 Feature: standby cluster
-  Scenario: check permanent logical slots are preserved on failover/switchover
-    Given I start postgres1
-    Then postgres1 is a leader after 10 seconds
-    When I issue a PATCH request to http://127.0.0.1:8009/config with {"slots": {"test_logical": {"type": "logical", "database": "postgres", "plugin": "test_decoding"}}}
-    Then I receive a response code 200
-    When I issue a PATCH request to http://127.0.0.1:8009/config with {"slots": {"pm_1": {"type": "physical"}}, "postgresql": {"parameters": {"wal_level": "logical"}}}
-    Then I receive a response code 200
-    When I start postgres0 with callback configured
-    Then "members/postgres0" key in DCS has state=running after 10 seconds
-    When I shut down postgres1
-    Then postgres0 is a leader after 10 seconds
-    And I sleep for 2 seconds
-    When I issue a GET request to http://127.0.0.1:8008/
-    Then I receive a response code 200
-    And there is a label with "test_logical" in postgres0 data directory
 
   Scenario: check replication of a single table in a standby cluster
-    Given I start postgres1 in a standby cluster batman1 as a clone of postgres0
+    Given I start postgres0 without slots sync
+    And I create a replication slot postgres1 on postgres0
+    And I start postgres1 in a standby cluster batman1 as a clone of postgres0
     Then postgres1 is a leader of batman1 after 10 seconds
-    When I issue a PATCH request to http://127.0.0.1:8009/config with {"ttl": 20, "loop_wait": 2}
-    And I add the table foo to postgres0
+    When I add the table foo to postgres0
     Then table foo is present on postgres1 after 20 seconds
     When I start postgres2 in a cluster batman1
     Then postgres2 role is the replica after 24 seconds
@@ -27,5 +13,4 @@ Feature: standby cluster
 
   Scenario: check failover
     When I kill postgres1
-    And I kill postmaster on postgres1
-    Then postgres2 is replicating from postgres0 after 20 seconds
+	Then postgres2 is replicating from postgres0 after 20 seconds

features/steps/standby_cluster.py

@@ -1,4 +1,3 @@
-import os
 import time
 
 from behave import step
@@ -9,13 +8,19 @@ SELECT * FROM pg_catalog.pg_stat_replication
 WHERE application_name = '{0}'
 """
 
+create_replication_slot_query = """
+SELECT pg_create_physical_replication_slot('{0}')
+"""
 
-@step('I start {name:w} with callback configured')
-def start_patroni_with_callbacks(context, name):
+
+@step('I start {name:w} without slots sync')
+def start_patroni_without_slots_sync(context, name):
     return context.pctl.start(name, custom_config={
-        "postgresql": {
-            "callbacks": {
-                "on_role_change": "features/callback.sh"
+        "bootstrap": {
+            "dcs": {
+                "postgresql": {
+                    "use_slots": False
+                }
             }
         }
     })
@@ -30,10 +35,6 @@ def start_patroni(context, name, cluster_name):
 
 @step('I start {name:w} in a standby cluster {cluster_name:w} as a clone of {name2:w}')
 def start_patroni_stanby_cluster(context, name, cluster_name, name2):
-    ctl = context.pctl._processes.pop(name, None)
-    # we need to remove patroni.dynamic.json in order to "bootstrap" standby cluster with existing PGDATA
-    if ctl:
-        os.unlink(os.path.join(ctl._data_dir, 'patroni.dynamic.json'))
     port = context.pctl._processes[name2]._connkwargs.get('port')
     return context.pctl.start(name, custom_config={
         "scope": cluster_name,
@@ -42,7 +43,7 @@ def start_patroni_stanby_cluster(context, name, cluster_name, name2):
                 "standby_cluster": {
                     "host": "localhost",
                     "port": port,
-                    "primary_slot_name": "pm_1",
+                    "primary_slot_name": "postgres1",
                 }
             }
         }
@@ -66,3 +67,12 @@ def check_replication_status(context, pg_name1, pg_name2, timeout):
         time.sleep(1)
 
     return False
+
+
+@step('I create a replication slot {slot_name:w} on {pg_name:w}')
+def create_replication_slot(context, slot_name, pg_name):
+    return context.pctl.query(
+        pg_name,
+        create_replication_slot_query.format(slot_name),
+        fail_ok=True
+    )

kubernetes/Dockerfile

@@ -1,29 +1,29 @@
-FROM postgres:9.6
+FROM postgres:10
 MAINTAINER Alexander Kukushkin <[email protected]>
 
 RUN export DEBIAN_FRONTEND=noninteractive \
     && echo 'APT::Install-Recommends "0";\nAPT::Install-Suggests "0";' > /etc/apt/apt.conf.d/01norecommend \
     && apt-get update -y \
     && apt-get upgrade -y \
-    && apt-get install -y git curl jq python-psycopg2 python-yaml python-requests python-six python-pysocks \
-        python-dateutil python-pip python-prettytable python-wheel python-psutil python locales \
+    && apt-get install -s patroni | sed -n -e '/^Inst patroni /d' -e 's/^Inst \([^ ]\+\) .*$/\1/p' \
+           | xargs apt-get install -y curl jq locales git python3-pip python3-wheel \
 
     ## Make sure we have a en_US.UTF-8 locale available
     && localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8 \
 
-    && pip install setuptools pip --upgrade \
-    && pip install 'git+https://github.com/zalando/patroni.git#egg=patroni[kubernetes]' \
+    && pip3 install setuptools \
+    && pip3 install 'git+https://github.com/zalando/patroni.git#egg=patroni[kubernetes]' \
 
     && mkdir -p /home/postgres \
     && chown postgres:postgres /home/postgres \
 
     # Clean up
-    && apt-get remove -y git python-pip python-setuptools \
+    && apt-get remove -y git python3-pip python3-wheel \
     && apt-get autoremove -y \
     && apt-get clean -y \
     && rm -rf /var/lib/apt/lists/* /root/.cache
 
-ADD entrypoint.sh callback.py /
+ADD entrypoint.sh /
 
 EXPOSE 5432 8008
 ENV LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8

kubernetes/callback.py

@@ -1,62 +0,0 @@
-#!/usr/bin/env python
-
-import logging
-import os
-import socket
-import sys
-import time
-
-from kubernetes import client as k8s_client, config as k8s_config
-from urllib3.exceptions import HTTPError
-from six.moves.http_client import HTTPException
-
-logger = logging.getLogger(__name__)
-
-
-class CoreV1Api(k8s_client.CoreV1Api):
-
-    def retry(func):
-        def wrapped(*args, **kwargs):
-            count = 0
-            while True:
-                try:
-                    return func(*args, **kwargs)
-                except (HTTPException, HTTPError, socket.error, socket.timeout):
-                    if count >= 10:
-                        raise
-                    logger.info('Throttling API requests...')
-                    time.sleep(2 ** count * 0.5)
-                    count += 1
-        return wrapped
-
-    @retry
-    def patch_namespaced_endpoints(self, *args, **kwargs):
-        return super(CoreV1Api, self).patch_namespaced_endpoints(*args, **kwargs)
-
-
-def patch_master_endpoint(api, namespace, cluster):
-    addresses = [k8s_client.V1EndpointAddress(ip=os.environ['POD_IP'])]
-    ports = [k8s_client.V1EndpointPort(port=5432)]
-    subsets = [k8s_client.V1EndpointSubset(addresses=addresses, ports=ports)]
-    body = k8s_client.V1Endpoints(subsets=subsets)
-    return api.patch_namespaced_endpoints(cluster, namespace, body)
-
-
-def main():
-    logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s', level=logging.INFO)
-    if len(sys.argv) != 4 or sys.argv[1] not in ('on_start', 'on_stop', 'on_role_change'):
-        sys.exit('Usage: %s <action> <role> <cluster_name>', sys.argv[0])
-
-    action, role, cluster = sys.argv[1:4]
-
-    k8s_config.load_incluster_config()
-    k8s_api = CoreV1Api()
-
-    namespace = os.environ['KUBERNETES_NAMESPACE']
-
-    if role == 'master' and action in ('on_start', 'on_role_change'):
-        patch_master_endpoint(k8s_api, namespace, cluster)
-
-
-if __name__ == '__main__':
-    main()

kubernetes/demo.sh

@@ -0,0 +1,189 @@
+#!/bin/bash
+
+# here you can defind your own alias to minikube
+lkubectl='kubectl --context=local'
+
+shopt -s expand_aliases
+
+alias lkubectl="$lkubectl"
+labels=application=patroni,cluster-name=patronidemo
+
+# clean up objects from previous attempts
+lkubectl delete statefulset,pods,service,endpoints -l $labels
+
+# clear old panes
+for pane in {3..1}; do
+    tmux send-keys -t 0.$pane C-c
+    tmux kill-pane -t 0.$pane
+done
+
+tmux send-keys -t 0.0 C-c
+tmux send-keys -t 0.0 C-l
+
+# split window into 3 panes
+tmux split-window -h -t 0.0
+tmux split-window -v -t 0.0
+tmux split-window -v -t 0.1
+
+tmux send-keys -t 0.3 "export PGPASSWORD=zalando" Enter
+tmux send-keys -t 0.3 "export PGCONNECT_TIMEOUT=1" Enter
+
+for pane in {0..3}; do
+    tmux send-keys -t 0.$pane "shopt -s expand_aliases" Enter
+    tmux send-keys -t 0.$pane "alias lkubectl='$lkubectl'" Enter
+    tmux send-keys -t 0.$pane C-l
+done
+
+# run 
+tmux resize-pane -Z -t 0.3
+
+tmux send-keys -t 0.3 "lkubectl apply -f patroni_k8s.yaml" Enter
+
+tmux send-keys -t 0.3 "lkubectl get pods -w -l $labels -L role -o wide" Enter
+
+read
+
+tmux send-keys -t 0.3 C-c
+#tmux send-keys -t 0.3 C-l
+#
+#tmux send-keys -t 0.3 "lkubectl get pods -l $labels -L role -o wide" Enter
+#
+#read
+
+# tail logs from patroni pods
+for pane in {0..2}; do
+    tmux send-keys -t 0.$pane "lkubectl logs patronidemo-$pane -f" Enter
+done
+
+tmux resize-pane -Z -t 0.3
+
+read
+
+tmux resize-pane -Z -t 0.0
+
+read
+
+tmux resize-pane -Z -t 0.0
+
+read
+
+tmux resize-pane -Z -t 0.1
+
+read
+
+tmux resize-pane -Z -t 0.1
+
+read
+
+tmux resize-pane -Z -t 0.3
+tmux send-keys -t 0.3 C-l
+
+tmux send-keys -t 0.3 "lkubectl get pods -l $labels -L role -o wide" Enter
+
+read
+
+tmux send-keys -t 0.3 Enter
+tmux send-keys -t 0.3 "lkubectl get services -l $labels" Enter
+
+read
+
+tmux send-keys -t 0.3 Enter
+tmux send-keys -t 0.3 "lkubectl get endpoints -l $labels" Enter
+
+read
+
+tmux send-keys -t 0.3 C-l
+tmux send-keys -t 0.3 "lkubectl get pods -l $labels -L role -o wide" Enter
+tmux send-keys -t 0.3 Enter
+tmux send-keys -t 0.3 "lkubectl get endpoints patronidemo -o yaml" Enter
+
+read
+
+tmux send-keys -t 0.3 C-l
+tmux send-keys -t 0.3 "lkubectl get pods -l $labels -L role -o wide" Enter
+tmux send-keys -t 0.3 Enter
+tmux send-keys -t 0.3 "lkubectl describe service patronidemo-repl" Enter
+
+read
+
+tmux send-keys -t 0.3 C-l
+tmux send-keys -t 0.3 "lkubectl get endpoints patronidemo-config -o yaml" Enter
+
+read
+
+MASTERIP=$(lkubectl get service patronidemo -o jsonpath='{.spec.clusterIP}')
+
+tmux resize-pane -Z -t 0.3
+
+tmux send-keys -t 0.3 "watch -n 1 \"psql -h $MASTERIP -U postgres -c \\\"select txid_current(), array_agg(application_name||'=>'|| sync_state) AS \\\\\\\"array_agg(application_name||'=>'||sync_state)\\\\\\\" from pg_stat_replication\\\"\"" Enter
+
+read
+
+# kill master node
+lkubectl delete pod patronidemo-0
+
+read
+
+tmux resize-pane -Z -t 0.1
+tmux send-keys -t 0.1 C-b PageUp
+
+read
+
+tmux send-keys -t 0.1 Enter
+tmux resize-pane -Z -t 0.1
+
+read
+
+tmux resize-pane -Z -t 0.2
+tmux send-keys -t 0.2 PageUp
+
+read
+
+tmux send-keys -t 0.2 Enter
+tmux resize-pane -Z -t 0.2
+
+read
+
+tmux send-keys -t 0.0 C-c
+tmux send-keys -t 0.0 "lkubectl logs patronidemo-0 -f" Enter
+
+read
+
+tmux resize-pane -Z -t 0.3
+tmux send-keys -t 0.3 C-c 
+tmux send-keys -t 0.3 C-l
+tmux send-keys -t 0.3 "lkubectl get pods -l $labels -L role -o wide" Enter
+tmux send-keys -t 0.3 Enter
+tmux send-keys -t 0.3 "lkubectl get endpoints -l $labels" Enter
+
+read
+
+tmux send-keys -t 0.3 C-l
+tmux send-keys -t 0.3 "lkubectl get endpoints patronidemo -o yaml" Enter
+
+read
+
+tmux resize-pane -Z -t 0.3
+tmux send-keys -t 0.3 C-c 
+tmux send-keys -t 0.3 C-l
+tmux send-keys -t 0.3 "lkubectl exec -ti patronidemo-0 patronictl switchover patronidemo" Enter
+
+read
+
+tmux send-keys -t 0.3 Enter
+
+read
+
+tmux send-keys -t 0.3 "patronidemo-0" Enter
+
+read
+
+tmux send-keys -t 0.3 Enter
+
+read
+
+tmux send-keys -t 0.3 "y" Enter
+
+read
+
+tmux send-keys -t 0.3 "lkubectl exec -ti patronidemo-0 patronictl list patronidemo" Enter

kubernetes/entrypoint.sh

@@ -13,24 +13,11 @@ bootstrap:
   - data-checksums
   pg_hba:
   - host all all 0.0.0.0/0 md5
-  - host replication ${PATRONI_REPLICATION_USERNAME} ${POD_IP}/16    md5
+  - host replication ${PATRONI_REPLICATION_USERNAME} ${PATRONI_KUBERNETES_POD_IP}/16    md5
 restapi:
-  connect_address: '${POD_IP}:8008'
+  connect_address: '${PATRONI_KUBERNETES_POD_IP}:8008'
 postgresql:
-  connect_address: '${POD_IP}:5432'
-  authentication:
-    superuser:
-      password: '${PATRONI_SUPERUSER_PASSWORD}'
-    replication:
-      password: '${PATRONI_REPLICATION_PASSWORD}'
-  callbacks:
-    on_start: /callback.py
-    on_stop: /callback.py
-    on_role_change: /callback.py
+  connect_address: '${PATRONI_KUBERNETES_POD_IP}:5432'
 __EOF__
 
-unset PATRONI_SUPERUSER_PASSWORD PATRONI_REPLICATION_PASSWORD
-export KUBERNETES_NAMESPACE=$PATRONI_KUBERNETES_NAMESPACE
-export POD_NAME=$PATRONI_NAME
-
-exec /usr/bin/python /usr/local/bin/patroni /home/postgres/patroni.yml
+exec /usr/bin/python3 /usr/local/bin/patroni /home/postgres/patroni.yml

kubernetes/patroni_k8s.yaml

@@ -1,3 +1,5 @@
+# This manifest (and Docker image) works only with emptyDir volume and are designed for demo purpose.
+# For production usage please take a look at https://github.com/zalando/spilo/tree/master/postgres-appliance
 apiVersion: apps/v1beta1
 kind: StatefulSet
 metadata:
@@ -19,6 +21,9 @@ spec:
       - name: *cluster_name
         image: patroni  # docker build -t patroni .
         imagePullPolicy: IfNotPresent
+#        resources:
+#          limits:
+#            cpu: 100m
         ports:
         - containerPort: 8008
           protocol: TCP
@@ -28,7 +33,7 @@ spec:
         - mountPath: /home/postgres/pgdata
           name: pgdata
         env:
-        - name: POD_IP
+        - name: PATRONI_KUBERNETES_POD_IP
           valueFrom:
             fieldRef:
               fieldPath: status.podIP
@@ -36,6 +41,8 @@ spec:
           valueFrom:
             fieldRef:
               fieldPath: metadata.namespace
+        - name: PATRONI_KUBERNETES_USE_ENDPOINTS
+          value: 'true'
         - name: PATRONI_KUBERNETES_LABELS
           value: '{application: patroni, cluster-name: patronidemo}'
         - name: PATRONI_SUPERUSER_USERNAME
@@ -86,6 +93,7 @@ spec:
 #          storage: 5Gi
 
 ---
+# Endpoint for leader elections
 apiVersion: v1
 kind: Endpoints
 metadata:
@@ -96,6 +104,7 @@ metadata:
 subsets: []
 
 ---
+# master Service
 apiVersion: v1
 kind: Service
 metadata:
@@ -110,6 +119,26 @@ spec:
     targetPort: 5432
 
 ---
+# replica Service
+apiVersion: v1
+kind: Service
+metadata:
+  name: patronidemo-repl
+  labels:
+    application: patroni
+    cluster-name: &cluster_name patronidemo
+spec:
+  type: ClusterIP
+  selector:
+    application: patroni
+    cluster-name: *cluster_name
+    role: replica
+  ports:
+  - port: 5432
+    targetPort: 5432
+
+---
+# Secrets (superuser password and replication passwor)
 apiVersion: v1
 kind: Secret
 metadata:

patroni/__init__.py

@@ -125,8 +125,7 @@ class Patroni(object):
     def setup_signal_handlers(self):
         self._received_sighup = False
         self._received_sigterm = False
-        if os.name != 'nt':
-            signal.signal(signal.SIGHUP, self.sighup_handler)
+        signal.signal(signal.SIGHUP, self.sighup_handler)
         signal.signal(signal.SIGTERM, self.sigterm_handler)
 
     def shutdown(self):
@@ -155,8 +154,6 @@ def patroni_main():
 
 def pg_ctl_start(args):
     import subprocess
-    if os.name != 'nt':
-        os.setsid()
     postmaster = subprocess.Popen(args)
     print(postmaster.pid)
 
@@ -200,13 +197,11 @@ def main():
             os.kill(pid, signo)
 
     signal.signal(signal.SIGCHLD, sigchld_handler)
-    if os.name != 'nt':
-        signal.signal(signal.SIGHUP, passtochild)
-        signal.signal(signal.SIGQUIT, passtochild)
+    signal.signal(signal.SIGHUP, passtochild)
     signal.signal(signal.SIGINT, passtochild)
     signal.signal(signal.SIGUSR1, passtochild)
     signal.signal(signal.SIGUSR2, passtochild)
-    signal.signal(signal.SIGABRT, passtochild)
+    signal.signal(signal.SIGQUIT, passtochild)
     signal.signal(signal.SIGTERM, passtochild)
 
     patroni = call_self(sys.argv[1:])

patroni/api.py

@@ -1,11 +1,11 @@
 import base64
+import fcntl
 import json
 import logging
 import psycopg2
 import time
 import dateutil.parser
 import datetime
-import os
 
 from patroni.postgresql import PostgresConnectionException, PostgresException, Postgresql
 from patroni.utils import deep_compare, parse_bool, patch_config, Retry, \
@@ -87,14 +87,8 @@ class RestApiHandler(BaseHTTPRequestHandler):
         replica_status_code = 200 if not patroni.noloadbalance and response.get('role') == 'replica' else 503
         status_code = 503
 
-        if patroni.ha.is_standby_cluster() and ('standby_leader' in path or 'standby-leader' in path):
+        if 'master' in path:
             status_code = 200 if patroni.ha.is_leader() else 503
-        elif 'master' in path or 'leader' in path or 'primary' in path:
-            # Round-robing across all masters in pause mode if DCS is not accessible
-            if not cluster and patroni.ha.is_paused():
-                status_code = 200 if response['role'] == 'master' else 503
-            else:
-                status_code = 200 if patroni.ha.is_leader() else 503
         elif 'replica' in path:
             status_code = replica_status_code
         elif cluster:  # dcs is available
@@ -412,20 +406,17 @@ class RestApiHandler(BaseHTTPRequestHandler):
                 raise RetryFailedError('')
             stmt = ("WITH replication_info AS ("
                     "SELECT usename, application_name, client_addr, state, sync_state, sync_priority"
-                    " FROM pg_catalog.pg_stat_replication) SELECT"
-                    " pg_catalog.to_char(pg_catalog.pg_postmaster_start_time(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'),"
-                    " CASE WHEN pg_catalog.pg_is_in_recovery() THEN 0"
-                    " ELSE ('x' || pg_catalog.substr(pg_catalog.pg_{0}file_name("
-                    "pg_catalog.pg_current_{0}_{1}()), 1, 8))::bit(32)::int END,"
-                    " CASE WHEN pg_catalog.pg_is_in_recovery() THEN 0"
-                    " ELSE pg_catalog.pg_{0}_{1}_diff(pg_catalog.pg_current_{0}_{1}(), '0/0')::bigint END,"
-                    " pg_catalog.pg_{0}_{1}_diff(COALESCE(pg_catalog.pg_last_{0}_receive_{1}(),"
-                    " pg_catalog.pg_last_{0}_replay_{1}()), '0/0')::bigint,"
-                    " pg_catalog.pg_{0}_{1}_diff(pg_catalog.pg_last_{0}_replay_{1}(), '0/0')::bigint,"
-                    " pg_catalog.to_char(pg_catalog.pg_last_xact_replay_timestamp(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'),"
-                    " pg_catalog.pg_is_in_recovery() AND pg_catalog.pg_is_{0}_replay_paused(), "
-                    "(SELECT pg_catalog.array_to_json(pg_catalog.array_agg("
-                    "pg_catalog.row_to_json(ri))) FROM replication_info ri)")
+                    " FROM pg_stat_replication) SELECT"
+                    " to_char(pg_postmaster_start_time(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'),"
+                    " CASE WHEN pg_is_in_recovery() THEN 0"
+                    " ELSE ('x' || SUBSTR(pg_{0}file_name(pg_current_{0}_{1}()), 1, 8))::bit(32)::int END,"
+                    " CASE WHEN pg_is_in_recovery() THEN 0"
+                    " ELSE pg_{0}_{1}_diff(pg_current_{0}_{1}(), '0/0')::bigint END,"
+                    " pg_{0}_{1}_diff(COALESCE(pg_last_{0}_receive_{1}(), pg_last_{0}_replay_{1}()), '0/0')::bigint,"
+                    " pg_{0}_{1}_diff(pg_last_{0}_replay_{1}(), '0/0')::bigint,"
+                    " to_char(pg_last_xact_replay_timestamp(), 'YYYY-MM-DD HH24:MI:SS.MS TZ'),"
+                    " pg_is_in_recovery() AND pg_is_{0}_replay_paused(),"
+                    " (SELECT array_to_json(array_agg(row_to_json(ri))) FROM replication_info ri)")
 
             row = self.query(stmt.format(self.server.patroni.postgresql.wal_name,
                                          self.server.patroni.postgresql.lsn_name), retry=retry)[0]
@@ -488,10 +479,8 @@ class RestApiServer(ThreadingMixIn, HTTPServer, Thread):
 
     @staticmethod
     def _set_fd_cloexec(fd):
-        if os.name != 'nt':
-            import fcntl
-            flags = fcntl.fcntl(fd, fcntl.F_GETFD)
-            fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
+        flags = fcntl.fcntl(fd, fcntl.F_GETFD)
+        fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
 
     def check_basic_auth_key(self, key):
         return self.__auth_key == key

patroni/config.py

@@ -1,7 +1,6 @@
 import json
 import logging
 import os
-import shutil
 import six
 import sys
 import tempfile
@@ -9,7 +8,7 @@ import yaml
 
 from collections import defaultdict
 from copy import deepcopy
-from patroni.dcs import ClusterConfig
+from patroni.dcs import ClusterConfig, is_standby_cluster
 from patroni.postgresql import Postgresql
 from patroni.utils import deep_compare, parse_bool, parse_int, patch_config
 from requests.structures import CaseInsensitiveDict
@@ -99,6 +98,10 @@ class Config(object):
     def dynamic_configuration(self):
         return deepcopy(self._dynamic_configuration)
 
+    @property
+    def is_standby_cluster(self):
+        return is_standby_cluster(self._dynamic_configuration.get('standby_cluster'))
+
     def check_mode(self, mode):
         return bool(parse_bool(self._dynamic_configuration.get(mode)))
 
@@ -125,7 +128,7 @@ class Config(object):
                 with os.fdopen(fd, 'w') as f:
                     fd = None
                     json.dump(self.dynamic_configuration, f)
-                tmpfile = shutil.move(tmpfile, self._cache_file)
+                tmpfile = os.rename(tmpfile, self._cache_file)
                 self._cache_needs_saving = False
             except Exception:
                 logger.exception('Exception when saving file: %s', self._cache_file)

patroni/ctl.py

@@ -252,7 +252,7 @@ def get_cursor(cluster, connect_parameters, role='master', member=None):
     if role == 'any':
         return cursor
 
-    cursor.execute('SELECT pg_catalog.pg_is_in_recovery()')
+    cursor.execute('SELECT pg_is_in_recovery()')
     in_recovery = cursor.fetchone()[0]
 
     if in_recovery and role == 'replica' or not in_recovery and role == 'master':
@@ -392,7 +392,7 @@ def query_member(cluster, cursor, member, role, command, connect_parameters):
             logging.debug(message)
             return [[timestamp(0), message]], None
 
-        cursor.execute('SELECT pg_catalog.pg_is_in_recovery()')
+        cursor.execute('SELECT pg_is_in_recovery()')
         in_recovery = cursor.fetchone()[0]
 
         if in_recovery and role == 'master' or not in_recovery and role == 'replica':

patroni/dcs/__init__.py

@@ -6,38 +6,19 @@ import json
 import logging
 import os
 import pkgutil
-import re
 import six
 import sys
 
-from collections import defaultdict, namedtuple
-from copy import deepcopy
+from collections import namedtuple
 from patroni.exceptions import PatroniException
 from patroni.utils import parse_bool
 from random import randint
 from six.moves.urllib_parse import urlparse, urlunparse, parse_qsl
 from threading import Event, Lock
 
-slot_name_re = re.compile('^[a-z0-9_]{1,63}$')
 logger = logging.getLogger(__name__)
 
 
-def slot_name_from_member_name(member_name):
-    """Translate member name to valid PostgreSQL slot name.
-
-    PostgreSQL replication slot names must be valid PostgreSQL names. This function maps the wider space of
-    member names to valid PostgreSQL names. Names are lowercased, dashes and periods common in hostnames
-    are replaced with underscores, other characters are encoded as their unicode codepoint. Name is truncated
-    to 64 characters. Multiple different member names may map to a single slot name."""
-
-    def replace_char(match):
-        c = match.group(0)
-        return '_' if c in '-.' else "u{:04d}".format(ord(c))
-
-    slot_name = re.sub('[^a-z0-9_]', replace_char, member_name.lower())
-    return slot_name[0:63]
-
-
 def parse_connection_string(value):
     """Original Governor stores connection strings for each cluster members if a following format:
         postgres://{username}:{password}@{connect_address}/postgres
@@ -207,12 +188,13 @@ class RemoteMember(Member):
                 'create_replica_methods',
                 'restore_command',
                 'archive_cleanup_command',
-                'recovery_min_apply_delay',
-                'no_replication_slot')
+                'recovery_min_apply_delay')
 
     def __getattr__(self, name):
-        if name in RemoteMember.allowed_keys():
-            return self.data.get(name)
+        if name not in RemoteMember.allowed_keys():
+            return
+
+        return self.data.get(name)
 
 
 class Leader(namedtuple('Leader', 'index,session,member')):
@@ -292,24 +274,14 @@ class ClusterConfig(namedtuple('ClusterConfig', 'index,data,modify_index')):
     def from_node(index, data, modify_index=None):
         """
         >>> ClusterConfig.from_node(1, '{') is None
-        False
+        True
         """
 
         try:
             data = json.loads(data)
         except (TypeError, ValueError):
-            data = None
-            modify_index = 0
-        if not isinstance(data, dict):
-            data = {}
-        return ClusterConfig(index, data, index if modify_index is None else modify_index)
-
-    @property
-    def permanent_slots(self):
-        return isinstance(self.data, dict) and (
-                self.data.get('permanent_replication_slots') or
-                self.data.get('permanent_slots') or self.data.get('slots')
-        ) or {}
+            return None
+        return ClusterConfig(index, data, modify_index or index)
 
 
 class SyncState(namedtuple('SyncState', 'index,leader,sync_standby')):
@@ -425,64 +397,8 @@ class Cluster(namedtuple('Cluster', 'initialize,config,leader,last_leader_operat
     def is_synchronous_mode(self):
         return self.check_mode('synchronous_mode')
 
-    def get_replication_slots(self, name, role):
-        # if the replicatefrom tag is set on the member - we should not create the replication slot for it on
-        # the current master, because that member would replicate from elsewhere. We still create the slot if
-        # the replicatefrom destination member is currently not a member of the cluster (fallback to the
-        # master), or if replicatefrom destination member happens to be the current master
-        if role in ('master', 'standby_leader'):
-            slot_members = [m.name for m in self.members if m.name != name and
-                            (m.replicatefrom is None or m.replicatefrom == name or
-                             not self.has_member(m.replicatefrom))]
-            permanent_slots = (self.config and self.config.permanent_slots or {}).copy()
-        else:
-            # only manage slots for replicas that replicate from this one, except for the leader among them
-            slot_members = [m.name for m in self.members if m.replicatefrom == name and m.name != self.leader.name]
-            permanent_slots = {}
-
-        slots = {slot_name_from_member_name(name): {'type': 'physical'} for name in slot_members}
-
-        if len(slots) < len(slot_members):
-            # Find which names are conflicting for a nicer error message
-            slot_conflicts = defaultdict(list)
-            for name in slot_members:
-                slot_conflicts[slot_name_from_member_name(name)].append(name)
-            logger.error("Following cluster members share a replication slot name: %s",
-                         "; ".join("{} map to {}".format(", ".join(v), k)
-                                   for k, v in slot_conflicts.items() if len(v) > 1))
-
-        # "merge" replication slots for members with permanent_replication_slots
-        for name, value in permanent_slots.items():
-            if not slot_name_re.match(name):
-                logger.error("Invalid permanent replication slot name '%s'", name)
-                logger.error("Slot name may only contain lower case letters, numbers, and the underscore chars")
-                continue
-
-            if name in slots:
-                logger.error("Permanent replication slot {'%s': %s} is conflicting with" +
-                             " physical replication slot for cluster member", name, value)
-                continue
-
-            value = deepcopy(value)
-            if not value:
-                value = {'type': 'physical'}
-
-            if isinstance(value, dict):
-                if 'type' not in value:
-                    value['type'] = 'logical' if value.get('database') and value.get('plugin') else 'physical'
-
-                if value['type'] == 'physical' or value['type'] == 'logical' \
-                        and value.get('database') and value.get('plugin'):
-                    slots[name] = value
-                    continue
-
-            logger.error("Bad value for slot '%s' in permanent_slots: %s", name, permanent_slots[name])
-
-        return slots
-
-    def has_permanent_logical_slots(self, name):
-        slots = self.get_replication_slots(name, 'master').values()
-        return any(v for v in slots if v.get("type") == "logical")
+    def is_standby_cluster(self):
+        return is_standby_cluster(self.config and self.config.data.get('standby_cluster'))
 
 
 @six.add_metaclass(abc.ABCMeta)
@@ -504,7 +420,7 @@ class AbstractDCS(object):
             i.e.: `zookeeper` for zookeeper, `etcd` for etcd, etc...
         """
         self._name = config['name']
-        self._base_path = re.sub('/+', '/', '/'.join(['', config.get('namespace', 'service'), config['scope']]))
+        self._base_path = os.path.join('/', config.get('namespace', '/service/').strip('/'), config['scope'])
         self._set_loop_wait(config.get('loop_wait', 10))
 
         self._ctl = bool(config.get('patronictl', False))
@@ -620,7 +536,7 @@ class AbstractDCS(object):
         You have to use CAS (Compare And Swap) operation in order to update leader key,
         for example for etcd `prevValue` parameter must be used."""
 
-    def update_leader(self, last_operation, access_is_restricted=False):
+    def update_leader(self, last_operation):
         """Update leader key (or session) ttl and optime/leader
 
         :param last_operation: absolute xlog location in bytes
@@ -737,3 +653,14 @@ class AbstractDCS(object):
 
         self.event.wait(timeout)
         return self.event.isSet()
+
+
+def is_standby_cluster(config):
+    """ Check whether or not provided configuration describes a standby cluster.
+        Config can be both patroni config or cluster.config.data
+    """
+    return isinstance(config, dict) and (
+        config.get('host') or
+        config.get('port') or
+        config.get('restore_command')
+    )

patroni/dcs/consul.py

@@ -288,7 +288,7 @@ class Consul(AbstractDCS):
             nodes = {}
             for node in results:
                 node['Value'] = (node['Value'] or b'').decode('utf-8')
-                nodes[os.path.relpath(node['Key'], path).replace('\\', '/')] = node
+                nodes[os.path.relpath(node['Key'], path)] = node
 
             # get initialize flag
             initialize = nodes.get(self._INITIALIZE)
@@ -377,7 +377,7 @@ class Consul(AbstractDCS):
 
     def _update_service(self, data):
         service_name = self._service_name
-        role = data['role'].replace('_', '-')
+        role = data['role']
         state = data['state']
         api_parts = urlparse(data['api_url'])
         api_parts = api_parts._replace(path='/{0}'.format(role))
@@ -394,7 +394,7 @@ class Consul(AbstractDCS):
         if state == 'stopped':
             return self.deregister_service(params['service_id'])
 
-        if role in ['master', 'replica', 'standby-leader']:
+        if role in ['master', 'replica']:
             if state != 'running':
                 return
             return self.register_service(service_name, **params)

patroni/dcs/etcd.py

@@ -448,7 +448,7 @@ class Etcd(AbstractDCS):
     def _load_cluster(self):
         try:
             result = self.retry(self._client.read, self.client_path(''), recursive=True)
-            nodes = {os.path.relpath(node.key, result.key).replace('\\', '/'): node for node in result.leaves}
+            nodes = {os.path.relpath(node.key, result.key): node for node in result.leaves}
 
             # get initialize flag
             initialize = nodes.get(self._INITIALIZE)

patroni/dcs/kubernetes.py

@@ -152,8 +152,7 @@ class Kubernetes(AbstractDCS):
 
             # get global dynamic configuration
             config = ClusterConfig.from_node(metadata and metadata.resource_version,
-                                             annotations.get(self._CONFIG) or '{}',
-                                             metadata.resource_version if self._CONFIG in annotations else 0)
+                                             annotations.get(self._CONFIG) or '{}')
 
             # get timeline history
             history = TimelineHistory.from_node(metadata and metadata.resource_version,
@@ -280,7 +279,7 @@ class Kubernetes(AbstractDCS):
     def _update_leader(self):
         """Unused"""
 
-    def update_leader(self, last_operation, access_is_restricted=False):
+    def update_leader(self, last_operation):
         now = datetime.datetime.now(tzutc).isoformat()
         annotations = {self._LEADER: self._name, 'ttl': str(self._ttl), 'renewTime': now,
                        'acquireTime': self._leader_observed_record.get('acquireTime') or now,
@@ -288,11 +287,7 @@ class Kubernetes(AbstractDCS):
         if last_operation:
             annotations[self._OPTIME] = last_operation
 
-        subsets = self.__subsets
-        if subsets is not None and access_is_restricted:
-            subsets = []
-
-        ret = self.patch_or_create(self.leader_path, annotations, self._leader_resource_version, subsets=subsets)
+        ret = self.patch_or_create(self.leader_path, annotations, self._leader_resource_version, subsets=self.__subsets)
         if ret:
             self._leader_resource_version = ret.metadata.resource_version
         return ret
@@ -312,8 +307,7 @@ class Kubernetes(AbstractDCS):
             else:
                 annotations['acquireTime'] = self._leader_observed_record.get('acquireTime') or now
             annotations['transitions'] = str(transitions)
-        subsets = [] if self.__subsets else None
-        ret = self.patch_or_create(self.leader_path, annotations, self._leader_resource_version, subsets=subsets)
+        ret = self.patch_or_create(self.leader_path, annotations, self._leader_resource_version, subsets=self.__subsets)
         if ret:
             self._leader_resource_version = ret.metadata.resource_version
         else:

patroni/ha.py

@@ -12,7 +12,7 @@ from collections import namedtuple
 from multiprocessing.pool import ThreadPool
 from patroni.async_executor import AsyncExecutor, CriticalTask
 from patroni.exceptions import DCSError, PostgresConnectionException, PatroniException
-from patroni.postgresql import ACTION_ON_START, ACTION_ON_ROLE_CHANGE
+from patroni.postgresql import ACTION_ON_START
 from patroni.utils import polling_loop, tzutc
 from patroni.dcs import RemoteMember
 from threading import RLock
@@ -61,7 +61,6 @@ class Ha(object):
         self.old_cluster = None
         self._is_leader = False
         self._is_leader_lock = RLock()
-        self._leader_access_is_restricted = False
         self._was_paused = False
         self._leader_timeline = None
         self.recovering = False
@@ -92,30 +91,14 @@ class Ha(object):
     def is_paused(self):
         return self.check_mode('pause')
 
-    def get_standby_cluster_config(self):
-        if self.cluster and self.cluster.config and self.cluster.config.modify_index:
-            config = self.cluster.config.data
-        else:
-            config = self.patroni.config.dynamic_configuration
-        return config.get('standby_cluster')
-
-    def is_standby_cluster(self):
-        config = self.get_standby_cluster_config()
-        # Check whether or not provided configuration describes a standby cluster
-        return isinstance(config, dict) and (config.get('host') or config.get('port') or config.get('restore_command'))
-
     def is_leader(self):
         with self._is_leader_lock:
-            return self._is_leader and not self._leader_access_is_restricted
+            return self._is_leader
 
     def set_is_leader(self, value):
         with self._is_leader_lock:
             self._is_leader = value
 
-    def set_leader_access_is_restricted(self, value):
-        with self._is_leader_lock:
-            self._leader_access_is_restricted = value
-
     def load_cluster_from_dcs(self):
         cluster = self.dcs.get_cluster()
 
@@ -130,7 +113,6 @@ class Ha(object):
         self._leader_timeline = None if cluster.is_unlocked() else cluster.leader.timeline
 
     def acquire_lock(self):
-        self.set_leader_access_is_restricted(self.cluster.has_permanent_logical_slots(self.state_handler.name))
         ret = self.dcs.attempt_to_acquire_leader()
         self.set_is_leader(ret)
         return ret
@@ -142,7 +124,7 @@ class Ha(object):
                 last_operation = self.state_handler.last_operation()
             except Exception:
                 logger.exception('Exception when called state_handler.last_operation()')
-        ret = self.dcs.update_leader(last_operation, self._leader_access_is_restricted)
+        ret = self.dcs.update_leader(last_operation)
         self.set_is_leader(ret)
         if ret:
             self.watchdog.keepalive()
@@ -169,10 +151,6 @@ class Ha(object):
                 'state': self.state_handler.state,
                 'role': self.state_handler.role
             }
-
-            # following two lines are mainly necessary for consul, to avoid creation of master service
-            if data['role'] == 'master' and not self.is_leader():
-                data['role'] = 'promoted'
             tags = self.get_effective_tags()
             if tags:
                 data['tags'] = tags
@@ -224,7 +202,7 @@ class Ha(object):
                 self.state_handler.bootstrapping = True
                 self._post_bootstrap_task = CriticalTask()
 
-                if self.is_standby_cluster():
+                if self.patroni.config.is_standby_cluster:
                     self._async_executor.schedule('bootstrap_standby_leader')
                     self._async_executor.run_async(self.bootstrap_standby_leader)
                     return 'trying to bootstrap a new standby leader'
@@ -250,7 +228,8 @@ class Ha(object):
             not a real master, but a 'standby leader', that will take base backup
             from a remote master and start follow it.
         """
-        clone_source = self.get_remote_master()
+        patroni_config = self.patroni.config.dynamic_configuration
+        clone_source = self.get_remote_master(patroni_config)
         msg = 'clone from remote master {0}'.format(clone_source.conn_url)
         result = self.clone(clone_source, msg)
         self._post_bootstrap_task.complete(result)
@@ -260,10 +239,9 @@ class Ha(object):
         return result
 
     def _handle_rewind(self):
-        leader = self.get_remote_master() if self.is_standby_cluster() else self.cluster.leader
-        if self.state_handler.rewind_needed_and_possible(leader):
-            self._async_executor.schedule('running pg_rewind from ' + leader.name)
-            self._async_executor.run_async(self.state_handler.rewind, (leader,))
+        if self.state_handler.rewind_needed_and_possible(self.cluster.leader):
+            self._async_executor.schedule('running pg_rewind from ' + self.cluster.leader.name)
+            self._async_executor.run_async(self.state_handler.rewind, (self.cluster.leader,))
             return True
 
     def recover(self):
@@ -295,24 +273,16 @@ class Ha(object):
 
         self.load_cluster_from_dcs()
 
-        if self.is_standby_cluster() or not self.has_lock():
+        if self.has_lock():
+            msg = "starting as readonly because i had the session lock"
+            node_to_follow = None
+        else:
             if not self.state_handler.rewind_executed:
                 self.state_handler.trigger_check_diverged_lsn()
             if self._handle_rewind():
                 return self._async_executor.scheduled_action
-
-            if self.has_lock():  # in standby cluster
-                msg = "starting as a standby leader because i had the session lock"
-                node_to_follow = self._get_node_to_follow(self.cluster)
-            elif self.is_standby_cluster() and self.cluster.is_unlocked():
-                msg = "trying to follow a remote master because standby cluster is unhealthy"
-                node_to_follow = self.get_remote_master()
-            else:
-                msg = "starting as a secondary"
-                node_to_follow = self._get_node_to_follow(self.cluster)
-        elif self.has_lock():
-            msg = "starting as readonly because i had the session lock"
-            node_to_follow = None
+            msg = "starting as a secondary"
+            node_to_follow = self._get_node_to_follow(self.cluster)
 
         self.recovering = True
 
@@ -325,8 +295,8 @@ class Ha(object):
         # try to follow the node mentioned there, otherwise, follow the leader.
         is_leader = self.cluster.leader and self.state_handler.name == self.cluster.leader.name
 
-        if self.is_standby_cluster() and (is_leader or self.cluster.is_unlocked()):
-            node_to_follow = self.get_remote_master()
+        if self.cluster.is_standby_cluster() and is_leader:
+            node_to_follow = self.get_remote_master(cluster.config.data)
         elif self.patroni.replicatefrom and self.patroni.replicatefrom != self.state_handler.name:
             node_to_follow = cluster.get_member(self.patroni.replicatefrom)
         else:
@@ -509,10 +479,8 @@ class Ha(object):
                     return 'Postponing promotion because synchronous replication state was updated by somebody else'
                 self.state_handler.set_synchronous_standby('*' if self.is_synchronous_mode_strict() else None)
             if self.state_handler.role != 'master':
-                self.set_leader_access_is_restricted(self.cluster.has_permanent_logical_slots(self.state_handler.name))
                 self._async_executor.schedule('promote')
-                self._async_executor.run_async(self.state_handler.promote,
-                                               args=(self.dcs.loop_wait, self._leader_access_is_restricted))
+                self._async_executor.run_async(self.state_handler.promote, args=(self.dcs.loop_wait,))
             return promote_message
 
     @staticmethod
@@ -812,7 +780,7 @@ class Ha(object):
                         self.dcs.manual_failover('', '')
                 self.load_cluster_from_dcs()
 
-                if self.is_standby_cluster():
+                if self.cluster.is_standby_cluster():
                     # standby leader disappeared, and this is a healthiest
                     # replica, so it should become a new standby leader.
                     # This imply that we need to start following a remote master
@@ -849,17 +817,12 @@ class Ha(object):
                 self.dcs.reset_cluster()
                 return 'removed leader lock because postgres is not running as master'
 
-            if self.state_handler.is_leader() and self._leader_access_is_restricted:
-                self.state_handler.sync_replication_slots(self.cluster)
-                self.state_handler.call_nowait(ACTION_ON_ROLE_CHANGE)
-                self.set_leader_access_is_restricted(False)
-
             if self.update_lock(True):
                 msg = self.process_manual_failover_from_leader()
                 if msg is not None:
                     return msg
 
-                if self.is_standby_cluster():
+                if self.cluster.is_standby_cluster():
                     # in case of standby cluster we don't really need to
                     # enforce anything, since the leader is not a master.
                     # So just remind the role.
@@ -999,8 +962,7 @@ class Ha(object):
 
     def _do_reinitialize(self, cluster):
         self.state_handler.stop('immediate')
-        # Commented redundant data directory cleanup here
-        # self.state_handler.remove_data_directory()
+        self.state_handler.remove_data_directory()
 
         clone_member = self.cluster.get_clone_member(self.state_handler.name)
         member_role = 'leader' if clone_member == self.cluster.leader else 'replica'
@@ -1093,7 +1055,6 @@ class Ha(object):
         if not self.watchdog.activate():
             logger.error('Cancelling bootstrap because watchdog activation failed')
             self.cancel_initialization()
-        self.state_handler.sync_replication_slots(self.cluster)
         self.dcs.take_leader()
         self.set_is_leader(True)
         self.state_handler.call_nowait(ACTION_ON_START)
@@ -1252,11 +1213,11 @@ class Ha(object):
                 # stops PostgreSQL, therefore, we only reload replication slots if no
                 # asynchronous processes are running (should be always the case for the master)
                 if not self._async_executor.busy and not self.state_handler.is_starting():
-                    self.state_handler.sync_replication_slots(self.cluster)
                     if not self.state_handler.cb_called:
                         if not self.state_handler.is_leader():
                             self.state_handler.trigger_check_diverged_lsn()
                         self.state_handler.call_nowait(ACTION_ON_START)
+                    self.state_handler.sync_replication_slots(self.cluster)
         except DCSError:
             dcs_failed = True
             logger.error('Error communicating with DCS')
@@ -1314,14 +1275,15 @@ class Ha(object):
         This usually happens on the master or if the node is running async action"""
         self.dcs.event.set()
 
-    def get_remote_master(self):
+    def get_remote_master(self, config):
         """ In case of standby cluster this will tel us from which remote
             master to stream. Config can be both patroni config or
             cluster.config.data
         """
-        cluster_params = self.get_standby_cluster_config()
+        config = config or (self.config is not None and self.config.data)
 
-        if cluster_params:
+        if config and config.get('standby_cluster'):
+            cluster_params = config.get('standby_cluster')
             unique_name = 'remote_master:{}'.format(uuid.uuid1())
             data = {
                 'conn_kwargs': {

patroni/postgresql.py

@@ -15,7 +15,7 @@ from patroni.callback_executor import CallbackExecutor
 from patroni.exceptions import PostgresConnectionException, PostgresException
 from patroni.utils import compare_values, parse_bool, parse_int, Retry, RetryFailedError, polling_loop, split_host_port
 from patroni.postmaster import PostmasterProcess
-from patroni.dcs import slot_name_from_member_name, RemoteMember
+from patroni.dcs import RemoteMember
 from requests.structures import CaseInsensitiveDict
 from six import string_types
 from six.moves.urllib.parse import quote_plus
@@ -37,16 +37,14 @@ STATE_UNKNOWN = 'unknown'
 
 STOP_POLLING_INTERVAL = 1
 REWIND_STATUS = type('Enum', (), {'INITIAL': 0, 'CHECK': 1, 'NEED': 2, 'NOT_NEED': 3, 'SUCCESS': 4, 'FAILED': 5})
-sync_standby_name_re = re.compile(r'^[A-Za-z_][A-Za-z_0-9\$]*$')
+sync_standby_name_re = re.compile('^[A-Za-z_][A-Za-z_0-9\$]*$')
 
-cluster_info_query = ("SELECT CASE WHEN pg_catalog.pg_is_in_recovery() THEN 0 "
-                      "ELSE ('x' || pg_catalog.substr(pg_catalog.pg_{0}file_name("
-                      "pg_catalog.pg_current_{0}_{1}()), 1, 8))::bit(32)::int END, "
-                      "CASE WHEN pg_catalog.pg_is_in_recovery() THEN GREATEST("
-                      " pg_catalog.pg_{0}_{1}_diff(COALESCE("
-                      "pg_catalog.pg_last_{0}_receive_{1}(), '0/0'), '0/0')::bigint,"
-                      " pg_catalog.pg_{0}_{1}_diff(pg_catalog.pg_last_{0}_replay_{1}(), '0/0')::bigint)"
-                      "ELSE pg_catalog.pg_{0}_{1}_diff(pg_catalog.pg_current_{0}_{1}(), '0/0')::bigint END")
+cluster_info_query = ("SELECT CASE WHEN pg_is_in_recovery() THEN 0 "
+                      "ELSE ('x' || SUBSTR(pg_{0}file_name(pg_current_{0}_{1}()), 1, 8))::bit(32)::int END, "
+                      "CASE WHEN pg_is_in_recovery() THEN GREATEST("
+                      " pg_{0}_{1}_diff(COALESCE(pg_last_{0}_receive_{1}(), '0/0'), '0/0')::bigint,"
+                      " pg_{0}_{1}_diff(pg_last_{0}_replay_{1}(), '0/0')::bigint)"
+                      "ELSE pg_{0}_{1}_diff(pg_current_{0}_{1}(), '0/0')::bigint END")
 
 
 def quote_ident(value):
@@ -54,6 +52,22 @@ def quote_ident(value):
     return value if sync_standby_name_re.match(value) else '"' + value + '"'
 
 
+def slot_name_from_member_name(member_name):
+    """Translate member name to valid PostgreSQL slot name.
+
+    PostgreSQL replication slot names must be valid PostgreSQL names. This function maps the wider space of
+    member names to valid PostgreSQL names. Names are lowercased, dashes and periods common in hostnames
+    are replaced with underscores, other characters are encoded as their unicode codepoint. Name is truncated
+    to 64 characters. Multiple different member names may map to a single slot name."""
+
+    def replace_char(match):
+        c = match.group(0)
+        return '_' if c in '-.' else "u{:04d}".format(ord(c))
+
+    slot_name = re.sub('[^a-z0-9_]', replace_char, member_name.lower())
+    return slot_name[0:63]
+
+
 @contextmanager
 def null_context():
     yield
@@ -140,7 +154,7 @@ class Postgresql(object):
         self._connection = None
         self._cursor_holder = None
         self._sysid = None
-        self._replication_slots = {}  # already existing replication slots
+        self._replication_slots = []  # list of already existing replication slots
         self.retry = Retry(max_tries=-1, deadline=config['retry_timeout']/2.0, max_delay=1,
                            retry_exceptions=PostgresConnectionException)
 
@@ -310,8 +324,8 @@ class Postgresql(object):
                     changes['wal_segment_size'] = '16384kB'
                 # XXX: query can raise an exception
                 for r in self.query("""SELECT name, setting, unit, vartype, context
-                                         FROM pg_catalog.pg_settings
-                                        WHERE pg_catalog.lower(name) IN (""" + ', '.join(['%s'] * len(changes)) + """)
+                                         FROM pg_settings
+                                        WHERE LOWER(name) IN (""" + ', '.join(['%s'] * len(changes)) + """)
                                         ORDER BY 1 DESC""", *(k.lower() for k in changes.keys())):
                     if r[4] == 'internal':
                         if r[0] == 'wal_segment_size':
@@ -626,8 +640,7 @@ class Postgresql(object):
             return os.environ.copy()
 
         with open(self._pgpass, 'w') as f:
-            if os.name != 'nt':
-                os.fchmod(f.fileno(), 0o600)
+            os.fchmod(f.fileno(), 0o600)
             f.write('{host}:{port}:*:{user}:{password}\n'.format(**record))
 
         env = os.environ.copy()
@@ -692,10 +705,8 @@ class Postgresql(object):
                     # if basebackup succeeds, exit with success
                     break
             else:
-                if not self.data_directory_empty() and not self.config.get(replica_method, {}).get('keep_data', False):
+                if not self.data_directory_empty():
                     self.remove_data_directory()
-                else:
-                    logger.info('Leaving data directory uncleaned')
 
                 cmd = replica_method
                 method_config = {}
@@ -708,14 +719,10 @@ class Postgresql(object):
                     cmd = method_config.pop('command', cmd)
 
                 # add the default parameters
-                if not method_config.get('no_params', False):
-                    method_config.update({"scope": self.scope,
-                                          "role": "replica",
-                                          "datadir": self._data_dir,
-                                          "connstring": connstring})
-                else:
-                    for param in ('no_params', 'no_master', 'keep_data'):
-                        method_config.pop(param, None)
+                method_config.update({"scope": self.scope,
+                                      "role": "replica",
+                                      "datadir": self._data_dir,
+                                      "connstring": connstring})
                 params = ["--{0}={1}".format(arg, val) for arg, val in method_config.items()]
                 try:
                     # call script with the full set of parameters
@@ -943,7 +950,7 @@ class Postgresql(object):
             with self._get_connection_cursor(**connect_kwargs) as cur:
                 cur.execute("SET statement_timeout = 0")
                 if check_not_is_in_recovery:
-                    cur.execute('SELECT pg_catalog.pg_is_in_recovery()')
+                    cur.execute('SELECT pg_is_in_recovery()')
                     if cur.fetchone()[0]:
                         return 'is_in_recovery=true'
                 return cur.execute('CHECKPOINT')
@@ -1117,10 +1124,9 @@ class Postgresql(object):
             # therefore we need to make sure that hba_file is not overriden
             # after changing superuser password we will "revert" all these "changes"
             if self._running_custom_bootstrap or 'hba_file' not in self._server_parameters:
-                f.write("hba_file = '{0}'\n".format(self._pg_hba_conf.replace('\\', '\\\\')))
+                f.write("hba_file = '{0}'\n".format(self._pg_hba_conf))
             if 'ident_file' not in self._server_parameters:
-                s = "ident_file = '{0}'\n".format(os.path.join(self._config_dir, 'pg_ident.conf').replace('\\', '\\\\'))
-                f.write(s)
+                f.write("ident_file = '{0}'\n".format(os.path.join(self._config_dir, 'pg_ident.conf')))
 
     def is_healthy(self):
         if not self.is_running():
@@ -1196,7 +1202,7 @@ class Postgresql(object):
             ('user', r.get('user')),
             ('host', r.get('host')),
             ('port', r.get('port')),
-            ('dbname', r.get('database') or self._database),
+            ('dbname', r.get('database')),
             ('sslmode', 'prefer'),
             ('sslcompression', '1'),
         ]
@@ -1215,10 +1221,8 @@ class Postgresql(object):
         # Don't try to call pg_controldata during backup restore
         if self._version_file_exists() and self.state != 'creating replica':
             try:
-                env = {'LANG': 'C', 'LC_ALL': 'C', 'PATH': os.getenv('PATH')}
-                if os.getenv('SYSTEMROOT') is not None:
-                    env['SYSTEMROOT'] = os.getenv('SYSTEMROOT')
-                data = subprocess.check_output([self._pgcommand('pg_controldata'), self._data_dir], env=env)
+                data = subprocess.check_output([self._pgcommand('pg_controldata'), self._data_dir],
+                                               env={'LANG': 'C', 'LC_ALL': 'C', 'PATH': os.environ['PATH']})
                 if data:
                     data = data.decode('utf-8').splitlines()
                     # pg_controldata output depends on major verion. Some of parameters are prefixed by 'Current '
@@ -1241,9 +1245,8 @@ class Postgresql(object):
                 yield cur
 
     @contextmanager
-    def _get_replication_connection_cursor(self, host='localhost', port=5432, database=None, **kwargs):
-        database = database or self._database
-        with self._get_connection_cursor(host=host, port=int(port), database=database, replication='database',
+    def _get_replication_connection_cursor(self, host='localhost', port=5432, **kwargs):
+        with self._get_connection_cursor(host=host, port=int(port), database=self._database, replication=1,
                                          user=self._replication['username'], password=self._replication['password'],
                                          connect_timeout=3, options='-c statement_timeout=2000') as cur:
             yield cur
@@ -1251,7 +1254,7 @@ class Postgresql(object):
     def check_leader_is_not_in_recovery(self, **kwargs):
         try:
             with self._get_connection_cursor(connect_timeout=3, options='-c statement_timeout=2000', **kwargs) as cur:
-                cur.execute('SELECT pg_catalog.pg_is_in_recovery()')
+                cur.execute('SELECT pg_is_in_recovery()')
                 if not cur.fetchone()[0]:
                     return True
                 logger.info('Leader is still in_recovery and therefore can\'t be used for rewind')
@@ -1362,10 +1365,10 @@ class Postgresql(object):
         history_path = 'pg_{0}/{1:08X}.history'.format(self.wal_name, timeline)
         try:
             cursor = self._cursor()
-            cursor.execute('SELECT isdir, modification FROM pg_catalog.pg_stat_file(%s)', (history_path,))
+            cursor.execute('SELECT isdir, modification FROM pg_stat_file(%s)', (history_path,))
             isdir, modification = cursor.fetchone()
             if not isdir:
-                cursor.execute('SELECT pg_catalog.pg_read_file(%s)', (history_path,))
+                cursor.execute('SELECT pg_read_file(%s)', (history_path,))
                 history = list(self.parse_history(cursor.fetchone()[0]))
                 if history[-1][0] == timeline - 1:
                     history[-1].append(modification.isoformat())
@@ -1494,7 +1497,7 @@ class Postgresql(object):
             if data.get('Database cluster state') == 'in production':
                 return True
 
-    def promote(self, wait_seconds, access_is_restricted=False):
+    def promote(self, wait_seconds):
         if self.role == 'master':
             return True
         ret = self.pg_ctl('promote', '-W')
@@ -1502,8 +1505,7 @@ class Postgresql(object):
             self.set_role('master')
             logger.info("cleared rewind state after becoming the leader")
             self._rewind_state = REWIND_STATUS.INITIAL
-            if not access_is_restricted:
-                self.call_nowait(ACTION_ON_ROLE_CHANGE)
+            self.call_nowait(ACTION_ON_ROLE_CHANGE)
             ret = self._wait_promote(wait_seconds)
         return ret
 
@@ -1536,88 +1538,61 @@ $$""".format(name, ' '.join(options)), name, password, password)
 
     def load_replication_slots(self):
         if self.use_slots and self._schedule_load_slots:
-            replication_slots = {}
-            cursor = self._query('SELECT slot_name, slot_type, plugin, database FROM pg_catalog.pg_replication_slots')
-            for r in cursor:
-                value = {'type': r[1]}
-                if r[1] == 'logical':
-                    value.update({'plugin': r[2], 'database': r[3]})
-                replication_slots[r[0]] = value
-            self._replication_slots = replication_slots
+            cursor = self._query("SELECT slot_name FROM pg_replication_slots WHERE slot_type='physical'")
+            self._replication_slots = [r[0] for r in cursor]
             self._schedule_load_slots = False
 
     def postmaster_start_time(self):
         try:
-            cursor = self.query("SELECT pg_catalog.to_char(pg_catalog.pg_postmaster_start_time(),"
-                                " 'YYYY-MM-DD HH24:MI:SS.MS TZ')")
+            cursor = self.query("""SELECT to_char(pg_postmaster_start_time(), 'YYYY-MM-DD HH24:MI:SS.MS TZ')""")
             return cursor.fetchone()[0]
         except psycopg2.Error:
             return None
 
-    def drop_replication_slot(self, name):
-        cursor = self._query(('SELECT pg_catalog.pg_drop_replication_slot(%s) WHERE EXISTS (SELECT 1 ' +
-                              'FROM pg_catalog.pg_replication_slots WHERE slot_name = %s AND NOT active)'), name, name)
-        # In normal situation rowcount should be 1, otherwise either slot doesn't exists or it is still active
-        return cursor.rowcount == 1
-
-    @staticmethod
-    def compare_slots(s1, s2):
-        return s1['type'] == s2['type'] and\
-                (s1['type'] == 'physical' or s1['database'] == s2['database'] and s1['plugin'] == s2['plugin'])
-
     def sync_replication_slots(self, cluster):
         if self.use_slots:
             try:
                 self.load_replication_slots()
+                # if the replicatefrom tag is set on the member - we should not create the replication slot for it on
+                # the current master, because that member would replicate from elsewhere. We still create the slot if
+                # the replicatefrom destination member is currently not a member of the cluster (fallback to the
+                # master), or if replicatefrom destination member happens to be the current master
+                if self.role in ('master', 'standby_leader'):
+                    slot_members = [m.name for m in cluster.members if m.name != self.name and
+                                    (m.replicatefrom is None or m.replicatefrom == self.name or
+                                     not cluster.has_member(m.replicatefrom))]
+                else:
+                    # only manage slots for replicas that replicate from this one, except for the leader among them
+                    slot_members = [m.name for m in cluster.members if m.replicatefrom == self.name and
+                                    m.name != cluster.leader.name]
+                slots = set(slot_name_from_member_name(name) for name in slot_members)
 
-                slots = cluster.get_replication_slots(self.name, self.role)
+                if len(slots) < len(slot_members):
+                    # Find which names are conflicting for a nicer error message
+                    slot_conflicts = defaultdict(list)
+                    for name in slot_members:
+                        slot_conflicts[slot_name_from_member_name(name)].append(name)
+                    logger.error("Following cluster members share a replication slot name: %s",
+                                 "; ".join("{} map to {}".format(", ".join(v), k)
+                                           for k, v in slot_conflicts.items() if len(v) > 1))
 
-                # drop old replication slots which are not presented in desired slots
-                for name in set(self._replication_slots) - set(slots):
-                    if not self.drop_replication_slot(name):
-                        logger.error("Failed to drop replication slot '%s'", name)
-                        self._schedule_load_slots = True
+                # drop unused slots
+                for slot in set(self._replication_slots) - slots:
+                    cursor = self._query("""SELECT pg_drop_replication_slot(%s)
+                                             WHERE EXISTS(SELECT 1 FROM pg_replication_slots
+                                             WHERE slot_name = %s AND NOT active)""", slot, slot)
+
+                    if cursor.rowcount != 1:  # Either slot doesn't exists or it is still active
+                        self._schedule_load_slots = True  # schedule load_replication_slots on the next iteration
 
                 immediately_reserve = ', true' if self._major_version >= 90600 else ''
 
-                logical_slots = defaultdict(dict)
-                for name, value in slots.items():
-                    if name in self._replication_slots and not self.compare_slots(value, self._replication_slots[name]):
-                        logger.info("Trying to drop replication slot '%s' because value is changing from %s to %s",
-                                    name, self._replication_slots[name], value)
-                        if not self.drop_replication_slot(name):
-                            logger.error("Failed to drop replication slot '%s'", name)
-                            self._schedule_load_slots = True
-                            continue
-                        self._replication_slots.pop(name)
-                    if name not in self._replication_slots:
-                        if value['type'] == 'physical':
-                            try:
-                                self._query(("SELECT pg_catalog.pg_create_physical_replication_slot(%s{0})" +
-                                             " WHERE NOT EXISTS (SELECT 1 FROM pg_catalog.pg_replication_slots" +
-                                             " WHERE slot_type = 'physical' AND slot_name = %s)").format(
-                                                 immediately_reserve), name, name)
-                            except Exception:
-                                logger.exception("Failed to create physical replication slot '%s'", name)
-                                self._schedule_load_slots = True
-                        elif value['type'] == 'logical' and name not in self._replication_slots:
-                            logical_slots[value['database']][name] = value
+                # create new slots
+                for slot in slots - set(self._replication_slots):
+                    self._query("""SELECT pg_create_physical_replication_slot(%s{0})
+                                    WHERE NOT EXISTS (SELECT 1 FROM pg_replication_slots
+                                    WHERE slot_name = %s)""".format(immediately_reserve), slot, slot)
 
-                # create new logical slots
-                for database, values in logical_slots.items():
-                    conn_kwargs = self._local_connect_kwargs
-                    conn_kwargs['database'] = database
-                    with self._get_connection_cursor(**conn_kwargs) as cur:
-                        for name, value in values.items():
-                            try:
-                                cur.execute("SELECT pg_catalog.pg_create_logical_replication_slot(%s, %s)" +
-                                            " WHERE NOT EXISTS (SELECT 1 FROM pg_catalog.pg_replication_slots" +
-                                            " WHERE slot_type = 'logical' AND slot_name = %s)",
-                                            (name, value['plugin'], name))
-                            except Exception:
-                                logger.exception("Failed to create logical replication slot '%s' plugin='%s'",
-                                                 name, value['plugin'])
-                                self._schedule_load_slots = True
                 self._replication_slots = slots
             except Exception:
                 logger.exception('Exception when changing replication slots')
@@ -1774,9 +1749,9 @@ $$""".format(name, ' '.join(options)), name, password, password)
         # Pick candidates based on who has flushed WAL farthest.
         # TODO: for synchronous_commit = remote_write we actually want to order on write_location
         for app_name, state, sync_state in self.query(
-                "SELECT pg_catalog.lower(application_name), state, sync_state"
-                " FROM pg_catalog.pg_stat_replication"
-                " ORDER BY flush_{0} DESC".format(self.lsn_name)):
+                """SELECT LOWER(application_name), state, sync_state
+                     FROM pg_stat_replication
+                    ORDER BY flush_{0} DESC""".format(self.lsn_name)):
             member = members.get(app_name)
             if state != 'streaming' or not member or member.tags.get('nosync', False):
                 continue

patroni/postmaster.py

@@ -12,7 +12,7 @@ logger = logging.getLogger(__name__)
 STOP_SIGNALS = {
     'smart': signal.SIGTERM,
     'fast': signal.SIGINT,
-    'immediate': signal.SIGQUIT if os.name != 'nt' else signal.SIGABRT,
+    'immediate': signal.SIGQUIT,
 }
 
 
@@ -138,8 +138,7 @@ class PostmasterProcess(psutil.Process):
         # of init process to take care about postmaster.
         # In order to make everything portable we can't use fork&exec approach here, so  we will call
         # ourselves and pass list of arguments which must be used to start postgres.
-        # On Windows, in order to run a side-by-side assembly the specified env must include a valid SYSTEMROOT.
-        env = {p: os.environ[p] for p in ('PATH', 'LD_LIBRARY_PATH', 'LC_ALL', 'LANG', 'SYSTEMROOT') if p in os.environ}
+        env = {p: os.environ[p] for p in ('PATH', 'LD_LIBRARY_PATH', 'LC_ALL', 'LANG') if p in os.environ}
         try:
             proc = PostmasterProcess._from_pidfile(data_dir)
             if proc and not proc._is_postmaster_process():
@@ -154,10 +153,10 @@ class PostmasterProcess(psutil.Process):
                 env['PG_GRANDPARENT_PID'] = str(proc.pid)
         except psutil.NoSuchProcess:
             pass
-        cmdline = [pgcommand, '-D', data_dir, '--config-file={}'.format(conf)] + options
-        logger.debug("Starting postgres: %s", " ".join(cmdline))
-        proc = call_self(['pg_ctl_start'] + cmdline, close_fds=(os.name != 'nt'),
-                         stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env)
+
+        proc = call_self(['pg_ctl_start', pgcommand, '-D', data_dir,
+                          '--config-file={}'.format(conf)] + options, close_fds=True,
+                         preexec_fn=os.setsid, stdout=subprocess.PIPE, env=env)
         pid = int(proc.stdout.readline().strip())
         proc.wait()
         logger.info('postmaster pid=%s', pid)

patroni/scripts/wale_restore.py

@@ -224,12 +224,13 @@ class WALERestore(object):
                             lsn_name = 'location'
                         con.autocommit = True
                         with con.cursor() as cur:
-                            cur.execute(("SELECT CASE WHEN pg_catalog.pg_is_in_recovery()"
-                                         " THEN GREATEST(pg_catalog.pg_{0}_{1}_diff(COALESCE("
-                                         "pg_last_{0}_receive_{1}(), '0/0'), %s)::bigint, "
-                                         "pg_catalog.pg_{0}_{1}_diff(pg_catalog.pg_last_{0}_replay_{1}(), %s)::bigint)"
-                                         " ELSE pg_catalog.pg_{0}_{1}_diff(pg_catalog.pg_current_{0}_{1}(), %s)::bigint"
-                                         " END").format(wal_name, lsn_name),
+                            cur.execute("""SELECT CASE WHEN pg_is_in_recovery()
+                                                       THEN GREATEST(
+                                                                pg_{0}_{1}_diff(COALESCE(
+                                                                  pg_last_{0}_receive_{1}(), '0/0'), %s)::bigint,
+                                                                pg_{0}_{1}_diff(pg_last_{0}_replay_{1}(), %s)::bigint)
+                                                       ELSE pg_{0}_{1}_diff(pg_current_{0}_{1}(), %s)::bigint
+                                                   END""".format(wal_name, lsn_name),
                                         (backup_start_lsn, backup_start_lsn, backup_start_lsn))
 
                             diff_in_bytes = int(cur.fetchone()[0])

patroni/version.py

@@ -1 +1 @@
-__version__ = '1.5.1'
+__version__ = '1.4.6'

setup.py

@@ -52,7 +52,6 @@ CLASSIFIERS = [
     'Operating System :: MacOS',
     'Operating System :: POSIX :: Linux',
     'Operating System :: POSIX :: BSD :: FreeBSD',
-    'Operating System :: Microsoft :: Windows',
     'Programming Language :: Python',
     'Programming Language :: Python :: 2.7',
     'Programming Language :: Python :: 3',
@@ -107,8 +106,6 @@ class PyTest(TestCommand):
         silence = logging.WARNING
         logging.basicConfig(format='%(asctime)s %(levelname)s: %(message)s', level=os.getenv('LOGLEVEL', silence))
         params['args'] += ['-s' if logging.getLogger().getEffectiveLevel() < silence else '--capture=fd']
-        if not os.getenv('SYSTEMROOT'):
-            os.environ['SYSTEMROOT'] = '/'
         errno = pytest.main(**params)
         sys.exit(errno)
 

tests/test_api.py

@@ -95,10 +95,6 @@ class MockHa(object):
     def is_paused():
         return True
 
-    @staticmethod
-    def is_standby_cluster():
-        return False
-
 
 class MockPatroni(object):
 
@@ -171,8 +167,6 @@ class TestRestApiHandler(unittest.TestCase):
         self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /master'))
         with patch.object(RestApiServer, 'query', Mock(return_value=[('', 1, '', '', '', '', False, '')])):
             self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'GET /patroni'))
-        with patch.object(MockHa, 'is_standby_cluster', Mock(return_value=True)):
-            MockRestApiServer(RestApiHandler, 'GET /standby_leader')
 
     def test_do_OPTIONS(self):
         self.assertIsNotNone(MockRestApiServer(RestApiHandler, 'OPTIONS / HTTP/1.0'))

tests/test_config.py

@@ -76,7 +76,7 @@ class TestConfig(unittest.TestCase):
     @patch('os.path.exists', Mock(return_value=True))
     @patch('os.remove', Mock(side_effect=IOError))
     @patch('os.close', Mock(side_effect=IOError))
-    @patch('shutil.move', Mock(return_value=None))
+    @patch('os.rename', Mock(return_value=None))
     @patch('json.dump', Mock())
     def test_save_cache(self):
         self.config.set_dynamic_configuration({'ttl': 30, 'postgresql': {'foo': 'bar'}})

tests/test_ctl.py

@@ -192,24 +192,24 @@ class TestCtl(unittest.TestCase):
 
     def test_query_member(self):
         with patch('patroni.ctl.get_cursor', Mock(return_value=MockConnect().cursor())):
-            rows = query_member(None, None, None, 'master', 'SELECT pg_catalog.pg_is_in_recovery()', {})
+            rows = query_member(None, None, None, 'master', 'SELECT pg_is_in_recovery()', {})
             self.assertTrue('False' in str(rows))
 
-            rows = query_member(None, None, None, 'replica', 'SELECT pg_catalog.pg_is_in_recovery()', {})
-            self.assertEqual(rows, (None, None))
+            rows = query_member(None, None, None, 'replica', 'SELECT pg_is_in_recovery()', {})
+            self.assertEquals(rows, (None, None))
 
             with patch('test_postgresql.MockCursor.execute', Mock(side_effect=OperationalError('bla'))):
-                rows = query_member(None, None, None, 'replica', 'SELECT pg_catalog.pg_is_in_recovery()', {})
+                rows = query_member(None, None, None, 'replica', 'SELECT pg_is_in_recovery()', {})
 
         with patch('patroni.ctl.get_cursor', Mock(return_value=None)):
-            rows = query_member(None, None, None, None, 'SELECT pg_catalog.pg_is_in_recovery()', {})
+            rows = query_member(None, None, None, None, 'SELECT pg_is_in_recovery()', {})
             self.assertTrue('No connection to' in str(rows))
 
-            rows = query_member(None, None, None, 'replica', 'SELECT pg_catalog.pg_is_in_recovery()', {})
+            rows = query_member(None, None, None, 'replica', 'SELECT pg_is_in_recovery()', {})
             self.assertTrue('No connection to' in str(rows))
 
         with patch('patroni.ctl.get_cursor', Mock(side_effect=OperationalError('bla'))):
-            rows = query_member(None, None, None, 'replica', 'SELECT pg_catalog.pg_is_in_recovery()', {})
+            rows = query_member(None, None, None, 'replica', 'SELECT pg_is_in_recovery()', {})
 
     @patch('patroni.ctl.get_dcs')
     def test_dsn(self, mock_get_dcs):
@@ -364,20 +364,20 @@ class TestCtl(unittest.TestCase):
         self.assertIsNone(get_any_member(get_cluster_initialized_without_leader(), role='master'))
 
         m = get_any_member(get_cluster_initialized_with_leader(), role='master')
-        self.assertEqual(m.name, 'leader')
+        self.assertEquals(m.name, 'leader')
 
     def test_get_all_members(self):
-        self.assertEqual(list(get_all_members(get_cluster_initialized_without_leader(), role='master')), [])
+        self.assertEquals(list(get_all_members(get_cluster_initialized_without_leader(), role='master')), [])
 
         r = list(get_all_members(get_cluster_initialized_with_leader(), role='master'))
-        self.assertEqual(len(r), 1)
-        self.assertEqual(r[0].name, 'leader')
+        self.assertEquals(len(r), 1)
+        self.assertEquals(r[0].name, 'leader')
 
         r = list(get_all_members(get_cluster_initialized_with_leader(), role='replica'))
-        self.assertEqual(len(r), 1)
-        self.assertEqual(r[0].name, 'other')
+        self.assertEquals(len(r), 1)
+        self.assertEquals(r[0].name, 'other')
 
-        self.assertEqual(len(list(get_all_members(get_cluster_initialized_without_leader(), role='replica'))), 2)
+        self.assertEquals(len(list(get_all_members(get_cluster_initialized_without_leader(), role='replica'))), 2)
 
     @patch('patroni.ctl.get_dcs')
     def test_members(self, mock_get_dcs):
@@ -499,23 +499,23 @@ class TestCtl(unittest.TestCase):
         after_editing, changed_config = apply_config_changes(before_editing, config,
                                                              ["postgresql.parameters.work_mem = 5MB",
                                                               "ttl=15", "postgresql.use_pg_rewind=off", 'a.b=c'])
-        self.assertEqual(changed_config, {"a": {"b": "c"}, "postgresql": {"parameters": {"work_mem": "5MB"},
-                                                                          "use_pg_rewind": False}, "ttl": 15})
+        self.assertEquals(changed_config, {"a": {"b": "c"}, "postgresql": {"parameters": {"work_mem": "5MB"},
+                                                                           "use_pg_rewind": False}, "ttl": 15})
 
         # postgresql.parameters namespace is flattened
         after_editing, changed_config = apply_config_changes(before_editing, config,
                                                              ["postgresql.parameters.work_mem.sub = x"])
-        self.assertEqual(changed_config, {"postgresql": {"parameters": {"work_mem": "4MB", "work_mem.sub": "x"},
-                                                         "use_pg_rewind": True}, "ttl": 30})
+        self.assertEquals(changed_config, {"postgresql": {"parameters": {"work_mem": "4MB", "work_mem.sub": "x"},
+                                                          "use_pg_rewind": True}, "ttl": 30})
 
         # Setting to null deletes
         after_editing, changed_config = apply_config_changes(before_editing, config,
                                                              ["postgresql.parameters.work_mem=null"])
-        self.assertEqual(changed_config, {"postgresql": {"use_pg_rewind": True}, "ttl": 30})
+        self.assertEquals(changed_config, {"postgresql": {"use_pg_rewind": True}, "ttl": 30})
         after_editing, changed_config = apply_config_changes(before_editing, config,
                                                              ["postgresql.use_pg_rewind=null",
                                                               "postgresql.parameters.work_mem=null"])
-        self.assertEqual(changed_config, {"ttl": 30})
+        self.assertEquals(changed_config, {"ttl": 30})
 
         self.assertRaises(PatroniCtlException, apply_config_changes, before_editing, config, ['a'])
 
@@ -572,5 +572,5 @@ class TestCtl(unittest.TestCase):
             assert 'failed to get version' in result.output
 
     def test_format_pg_version(self):
-        self.assertEqual(format_pg_version(100001), '10.1')
-        self.assertEqual(format_pg_version(90605), '9.6.5')
+        self.assertEquals(format_pg_version(100001), '10.1')
+        self.assertEquals(format_pg_version(90605), '9.6.5')

tests/test_etcd.py

@@ -215,8 +215,8 @@ class TestClient(unittest.TestCase):
             self.assertRaises(etcd.EtcdException, self.client.api_execute, '/', 'GET')
 
     def test_get_srv_record(self):
-        self.assertEqual(self.client.get_srv_record('_etcd-server._tcp.blabla'), [])
-        self.assertEqual(self.client.get_srv_record('_etcd-server._tcp.exception'), [])
+        self.assertEquals(self.client.get_srv_record('_etcd-server._tcp.blabla'), [])
+        self.assertEquals(self.client.get_srv_record('_etcd-server._tcp.exception'), [])
 
     def test__get_machines_cache_from_srv(self):
         self.client._get_machines_cache_from_srv('foobar')
@@ -259,7 +259,7 @@ class TestEtcd(unittest.TestCase):
                               'host': 'localhost:2379', 'scope': 'test', 'name': 'foo'})
 
     def test_base_path(self):
-        self.assertEqual(self.etcd._base_path, '/patroni/test')
+        self.assertEquals(self.etcd._base_path, '/patroni/test')
 
     @patch('dns.resolver.query', dns_query)
     def test_get_etcd_client(self):

tests/test_ha.py

@@ -5,6 +5,7 @@ import unittest
 import sys
 
 from mock import Mock, MagicMock, PropertyMock, patch
+from patroni.async_executor import CriticalTask
 from patroni.config import Config
 from patroni.dcs import Cluster, ClusterConfig, Failover, Leader, Member, get_dcs, SyncState, TimelineHistory
 from patroni.dcs.etcd import Client
@@ -61,6 +62,17 @@ def get_cluster_initialized_with_only_leader(failover=None, cluster_config=None)
     return get_cluster(True, leader, [leader], failover, None, cluster_config)
 
 
+def get_cluster_not_initialized_standby(failover=None, sync=None):
+    return get_cluster_not_initialized_without_leader(
+        cluster_config=ClusterConfig(1, {
+            "standby_cluster": {
+                "host": "localhost",
+                "port": 5432,
+                "primary_slot_name": "",
+            }}, 1)
+    )
+
+
 def get_standby_cluster_initialized_with_only_leader(failover=None, sync=None):
     return get_cluster_initialized_with_only_leader(
         cluster_config=ClusterConfig(1, {
@@ -146,6 +158,7 @@ def run_async(self, func, args=()):
 @patch.object(Postgresql, 'write_recovery_conf', Mock())
 @patch.object(Postgresql, 'query', Mock())
 @patch.object(Postgresql, 'checkpoint', Mock())
+@patch.object(Postgresql, 'call_nowait', Mock())
 @patch.object(Postgresql, 'cancellable_subprocess_call', Mock(return_value=0))
 @patch.object(etcd.Client, 'write', etcd_write)
 @patch.object(etcd.Client, 'read', etcd_read)
@@ -196,15 +209,22 @@ class TestHa(unittest.TestCase):
 
     def test_start_as_replica(self):
         self.p.is_healthy = false
-        self.assertEqual(self.ha.run_cycle(), 'starting as a secondary')
+        self.assertEquals(self.ha.run_cycle(), 'starting as a secondary')
 
     @patch('patroni.dcs.etcd.Etcd.initialize', return_value=True)
     def test_start_as_standby_leader(self, initialize):
         self.p.data_directory_empty = true
-        self.ha.cluster = get_cluster_not_initialized_without_leader(cluster_config=ClusterConfig(0, {}, 0))
+        self.ha.cluster = get_cluster_not_initialized_standby()
         self.ha.cluster.is_unlocked = true
-        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {"port": 5432}}
-        self.assertEqual(self.ha.run_cycle(), 'trying to bootstrap a new standby leader')
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
+        self.assertEquals(
+            self.ha.run_cycle(),
+            'trying to bootstrap a new standby leader'
+        )
 
     @patch.object(Cluster, 'get_clone_member',
                   Mock(return_value=Member(0, 'test', 1, {'api_url': 'http://127.0.0.1:8011/patroni'})))
@@ -213,14 +233,34 @@ class TestHa(unittest.TestCase):
         self.p.data_directory_empty = true
         self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
         self.ha.cluster.is_unlocked = false
-        self.assertEqual(self.ha.run_cycle(), "trying to bootstrap from replica 'test'")
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
+        self.assertEquals(
+            self.ha.run_cycle(),
+            "trying to bootstrap from replica 'test'"
+        )
+
+    @patch.object(Postgresql, 'create_replica', Mock(return_value=0))
+    def test_bootstrap_standby_leader(self):
+        self.ha.cluster = get_cluster_not_initialized_standby()
+        self.ha.cluster.is_unlocked = true
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
+        self.ha._post_bootstrap_task = CriticalTask()
+        self.assertEquals(self.ha.bootstrap_standby_leader(), True)
 
     def test_recover_replica_failed(self):
         self.p.controldata = lambda: {'Database cluster state': 'in recovery', 'Database system identifier': SYSID}
         self.p.is_running = false
         self.p.follow = false
-        self.assertEqual(self.ha.run_cycle(), 'starting as a secondary')
-        self.assertEqual(self.ha.run_cycle(), 'failed to start postgres')
+        self.assertEquals(self.ha.run_cycle(), 'starting as a secondary')
+        self.assertEquals(self.ha.run_cycle(), 'failed to start postgres')
 
     def test_recover_former_master(self):
         self.p.follow = false
@@ -229,19 +269,19 @@ class TestHa(unittest.TestCase):
         self.p.set_role('master')
         self.p.controldata = lambda: {'Database cluster state': 'shut down', 'Database system identifier': SYSID}
         self.ha.cluster = get_cluster_initialized_with_leader()
-        self.assertEqual(self.ha.run_cycle(), 'starting as readonly because i had the session lock')
+        self.assertEquals(self.ha.run_cycle(), 'starting as readonly because i had the session lock')
 
     @patch.object(Postgresql, 'fix_cluster_state', Mock())
     def test_crash_recovery(self):
         self.p.is_running = false
         self.p.controldata = lambda: {'Database cluster state': 'in production', 'Database system identifier': SYSID}
-        self.assertEqual(self.ha.run_cycle(), 'doing crash recovery in a single user mode')
+        self.assertEquals(self.ha.run_cycle(), 'doing crash recovery in a single user mode')
 
     @patch.object(Postgresql, 'rewind_needed_and_possible', Mock(return_value=True))
     def test_recover_with_rewind(self):
         self.p.is_running = false
         self.ha.cluster = get_cluster_initialized_with_leader()
-        self.assertEqual(self.ha.run_cycle(), 'running pg_rewind from leader')
+        self.assertEquals(self.ha.run_cycle(), 'running pg_rewind from leader')
 
     @patch('sys.exit', return_value=1)
     @patch('patroni.ha.Ha.sysid_valid', MagicMock(return_value=True))
@@ -256,129 +296,129 @@ class TestHa(unittest.TestCase):
         self.p.is_healthy = true
         self.ha.has_lock = true
         self.p.controldata = lambda: {'Database cluster state': 'in production', 'Database system identifier': SYSID}
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader because i had the session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader because i had the session lock')
 
     @patch('psycopg2.connect', psycopg2_connect)
     def test_acquire_lock_as_master(self):
-        self.assertEqual(self.ha.run_cycle(), 'acquired session lock as a leader')
+        self.assertEquals(self.ha.run_cycle(), 'acquired session lock as a leader')
 
     def test_promoted_by_acquiring_lock(self):
         self.ha.is_healthiest_node = true
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
 
     def test_long_promote(self):
         self.ha.cluster.is_unlocked = false
         self.ha.has_lock = true
         self.p.is_leader = false
         self.p.set_role('master')
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
 
     def test_demote_after_failing_to_obtain_lock(self):
         self.ha.acquire_lock = false
-        self.assertEqual(self.ha.run_cycle(), 'demoted self after trying and failing to obtain lock')
+        self.assertEquals(self.ha.run_cycle(), 'demoted self after trying and failing to obtain lock')
 
     def test_follow_new_leader_after_failing_to_obtain_lock(self):
         self.ha.is_healthiest_node = true
         self.ha.acquire_lock = false
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'following new leader after trying and failing to obtain lock')
+        self.assertEquals(self.ha.run_cycle(), 'following new leader after trying and failing to obtain lock')
 
     def test_demote_because_not_healthiest(self):
         self.ha.is_healthiest_node = false
-        self.assertEqual(self.ha.run_cycle(), 'demoting self because i am not the healthiest node')
+        self.assertEquals(self.ha.run_cycle(), 'demoting self because i am not the healthiest node')
 
     def test_follow_new_leader_because_not_healthiest(self):
         self.ha.is_healthiest_node = false
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'following a different leader because i am not the healthiest node')
+        self.assertEquals(self.ha.run_cycle(), 'following a different leader because i am not the healthiest node')
 
     def test_promote_because_have_lock(self):
         self.ha.cluster.is_unlocked = false
         self.ha.has_lock = true
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader because i had the session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader because i had the session lock')
 
     def test_promote_without_watchdog(self):
         self.ha.cluster.is_unlocked = false
         self.ha.has_lock = true
         self.p.is_leader = true
         with patch.object(Watchdog, 'activate', Mock(return_value=False)):
-            self.assertEqual(self.ha.run_cycle(), 'Demoting self because watchdog could not be activated')
+            self.assertEquals(self.ha.run_cycle(), 'Demoting self because watchdog could not be activated')
             self.p.is_leader = false
-            self.assertEqual(self.ha.run_cycle(), 'Not promoting self because watchdog could not be activated')
+            self.assertEquals(self.ha.run_cycle(), 'Not promoting self because watchdog could not be activated')
 
     def test_leader_with_lock(self):
         self.ha.cluster = get_cluster_not_initialized_without_leader()
         self.ha.cluster.is_unlocked = false
         self.ha.has_lock = true
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
 
     def test_demote_because_not_having_lock(self):
         self.ha.cluster.is_unlocked = false
         with patch.object(Watchdog, 'is_running', PropertyMock(return_value=True)):
-            self.assertEqual(self.ha.run_cycle(), 'demoting self because i do not have the lock and i was a leader')
+            self.assertEquals(self.ha.run_cycle(), 'demoting self because i do not have the lock and i was a leader')
 
     def test_demote_because_update_lock_failed(self):
         self.ha.cluster.is_unlocked = false
         self.ha.has_lock = true
         self.ha.update_lock = false
-        self.assertEqual(self.ha.run_cycle(), 'demoted self because failed to update leader lock in DCS')
+        self.assertEquals(self.ha.run_cycle(), 'demoted self because failed to update leader lock in DCS')
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'not promoting because failed to update leader lock in DCS')
+        self.assertEquals(self.ha.run_cycle(), 'not promoting because failed to update leader lock in DCS')
 
     def test_follow(self):
         self.ha.cluster.is_unlocked = false
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am a secondary and i am following a leader')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am a secondary and i am following a leader')
         self.ha.patroni.replicatefrom = "foo"
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am a secondary and i am following a leader')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am a secondary and i am following a leader')
 
     def test_follow_in_pause(self):
         self.ha.cluster.is_unlocked = false
         self.ha.is_paused = true
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: continue to run as master without lock')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: continue to run as master without lock')
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: no action')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: no action')
 
     @patch.object(Postgresql, 'rewind_needed_and_possible', Mock(return_value=True))
     def test_follow_triggers_rewind(self):
         self.p.is_leader = false
         self.p.trigger_check_diverged_lsn()
         self.ha.cluster = get_cluster_initialized_with_leader()
-        self.assertEqual(self.ha.run_cycle(), 'running pg_rewind from leader')
+        self.assertEquals(self.ha.run_cycle(), 'running pg_rewind from leader')
 
     def test_no_etcd_connection_master_demote(self):
         self.ha.load_cluster_from_dcs = Mock(side_effect=DCSError('Etcd is not responding properly'))
-        self.assertEqual(self.ha.run_cycle(), 'demoted self because DCS is not accessible and i was a leader')
+        self.assertEquals(self.ha.run_cycle(), 'demoted self because DCS is not accessible and i was a leader')
 
     @patch('time.sleep', Mock())
     def test_bootstrap_from_another_member(self):
         self.ha.cluster = get_cluster_initialized_with_leader()
-        self.assertEqual(self.ha.bootstrap(), 'trying to bootstrap from replica \'other\'')
+        self.assertEquals(self.ha.bootstrap(), 'trying to bootstrap from replica \'other\'')
 
     def test_bootstrap_waiting_for_leader(self):
         self.ha.cluster = get_cluster_initialized_without_leader()
-        self.assertEqual(self.ha.bootstrap(), 'waiting for leader to bootstrap')
+        self.assertEquals(self.ha.bootstrap(), 'waiting for leader to bootstrap')
 
     def test_bootstrap_without_leader(self):
         self.ha.cluster = get_cluster_initialized_without_leader()
         self.p.can_create_replica_without_replication_connection = MagicMock(return_value=True)
-        self.assertEqual(self.ha.bootstrap(), 'trying to bootstrap (without leader)')
+        self.assertEquals(self.ha.bootstrap(), 'trying to bootstrap (without leader)')
 
     def test_bootstrap_initialize_lock_failed(self):
         self.ha.cluster = get_cluster_not_initialized_without_leader()
-        self.assertEqual(self.ha.bootstrap(), 'failed to acquire initialize lock')
+        self.assertEquals(self.ha.bootstrap(), 'failed to acquire initialize lock')
 
     def test_bootstrap_initialized_new_cluster(self):
         self.ha.cluster = get_cluster_not_initialized_without_leader()
         self.e.initialize = true
-        self.assertEqual(self.ha.bootstrap(), 'trying to bootstrap a new cluster')
+        self.assertEquals(self.ha.bootstrap(), 'trying to bootstrap a new cluster')
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'waiting for end of recovery after bootstrap')
+        self.assertEquals(self.ha.run_cycle(), 'waiting for end of recovery after bootstrap')
         self.p.is_leader = true
-        self.assertEqual(self.ha.run_cycle(), 'running post_bootstrap')
-        self.assertEqual(self.ha.run_cycle(), 'initialized a new cluster')
+        self.assertEquals(self.ha.run_cycle(), 'running post_bootstrap')
+        self.assertEquals(self.ha.run_cycle(), 'initialized a new cluster')
 
     def test_bootstrap_release_initialize_key_on_failure(self):
         self.ha.cluster = get_cluster_not_initialized_without_leader()
@@ -394,7 +434,7 @@ class TestHa(unittest.TestCase):
         self.p.is_running.return_value = MockPostmaster()
         self.p.is_leader = true
         with patch.object(Watchdog, 'activate', Mock(return_value=False)):
-            self.assertEqual(self.ha.post_bootstrap(), 'running post_bootstrap')
+            self.assertEquals(self.ha.post_bootstrap(), 'running post_bootstrap')
             self.assertRaises(PatroniException, self.ha.post_bootstrap)
 
     @patch('psycopg2.connect', psycopg2_connect)
@@ -411,35 +451,35 @@ class TestHa(unittest.TestCase):
 
     @patch('time.sleep', Mock())
     def test_restart(self):
-        self.assertEqual(self.ha.restart({}), (True, 'restarted successfully'))
+        self.assertEquals(self.ha.restart({}), (True, 'restarted successfully'))
         self.p.restart = Mock(return_value=None)
-        self.assertEqual(self.ha.restart({}), (False, 'postgres is still starting'))
+        self.assertEquals(self.ha.restart({}), (False, 'postgres is still starting'))
         self.p.restart = false
-        self.assertEqual(self.ha.restart({}), (False, 'restart failed'))
+        self.assertEquals(self.ha.restart({}), (False, 'restart failed'))
         self.ha.cluster = get_cluster_initialized_with_leader()
         self.ha.reinitialize()
-        self.assertEqual(self.ha.restart({}), (False, 'reinitialize already in progress'))
+        self.assertEquals(self.ha.restart({}), (False, 'reinitialize already in progress'))
         with patch.object(self.ha, "restart_matches", return_value=False):
-            self.assertEqual(self.ha.restart({'foo': 'bar'}), (False, "restart conditions are not satisfied"))
+            self.assertEquals(self.ha.restart({'foo': 'bar'}), (False, "restart conditions are not satisfied"))
 
     @patch('os.kill', Mock())
     def test_restart_in_progress(self):
         with patch('patroni.async_executor.AsyncExecutor.busy', PropertyMock(return_value=True)):
             self.ha.restart({}, run_async=True)
             self.assertTrue(self.ha.restart_scheduled())
-            self.assertEqual(self.ha.run_cycle(), 'restart in progress')
+            self.assertEquals(self.ha.run_cycle(), 'restart in progress')
 
             self.ha.cluster = get_cluster_initialized_with_leader()
-            self.assertEqual(self.ha.run_cycle(), 'restart in progress')
+            self.assertEquals(self.ha.run_cycle(), 'restart in progress')
 
             self.ha.has_lock = true
-            self.assertEqual(self.ha.run_cycle(), 'updated leader lock during restart')
+            self.assertEquals(self.ha.run_cycle(), 'updated leader lock during restart')
 
             self.ha.update_lock = false
             self.p.set_role('master')
             with patch('patroni.async_executor.CriticalTask.cancel', Mock(return_value=False)):
                 with patch('patroni.postgresql.Postgresql.terminate_starting_postmaster') as mock_terminate:
-                    self.assertEqual(self.ha.run_cycle(), 'lost leader lock during restart')
+                    self.assertEquals(self.ha.run_cycle(), 'lost leader lock during restart')
                     mock_terminate.assert_called()
 
     @patch('requests.get', requests_get)
@@ -447,25 +487,25 @@ class TestHa(unittest.TestCase):
         self.ha.fetch_node_status = get_node_status()
         self.ha.has_lock = true
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', '', None))
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, '', self.p.name, None))
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, '', 'blabla', None))
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
         f = Failover(0, self.p.name, '', None)
         self.ha.cluster = get_cluster_initialized_with_leader(f)
-        self.assertEqual(self.ha.run_cycle(), 'manual failover: demoting myself')
+        self.assertEquals(self.ha.run_cycle(), 'manual failover: demoting myself')
         self.p.rewind_needed_and_possible = true
-        self.assertEqual(self.ha.run_cycle(), 'manual failover: demoting myself')
+        self.assertEquals(self.ha.run_cycle(), 'manual failover: demoting myself')
         self.ha.fetch_node_status = get_node_status(nofailover=True)
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
         self.ha.fetch_node_status = get_node_status(watchdog_failed=True)
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
         self.ha.fetch_node_status = get_node_status(wal_position=1)
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
         # manual failover from the previous leader to us won't happen if we hold the nofailover flag
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', self.p.name, None))
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
 
         # Failover scheduled time must include timezone
         scheduled = datetime.datetime.now()
@@ -474,19 +514,19 @@ class TestHa(unittest.TestCase):
 
         scheduled = datetime.datetime.utcnow().replace(tzinfo=tzutc)
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', self.p.name, scheduled))
-        self.assertEqual('no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('no action.  i am the leader with the lock', self.ha.run_cycle())
 
         scheduled = scheduled + datetime.timedelta(seconds=30)
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', self.p.name, scheduled))
-        self.assertEqual('no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('no action.  i am the leader with the lock', self.ha.run_cycle())
 
         scheduled = scheduled + datetime.timedelta(seconds=-600)
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', self.p.name, scheduled))
-        self.assertEqual('no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('no action.  i am the leader with the lock', self.ha.run_cycle())
 
         scheduled = None
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', self.p.name, scheduled))
-        self.assertEqual('no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('no action.  i am the leader with the lock', self.ha.run_cycle())
 
     @patch('requests.get', requests_get)
     def test_manual_failover_from_leader_in_pause(self):
@@ -494,9 +534,9 @@ class TestHa(unittest.TestCase):
         self.ha.is_paused = true
         scheduled = datetime.datetime.now()
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, 'blabla', self.p.name, scheduled))
-        self.assertEqual('PAUSE: no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('PAUSE: no action.  i am the leader with the lock', self.ha.run_cycle())
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, self.p.name, '', None))
-        self.assertEqual('PAUSE: no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('PAUSE: no action.  i am the leader with the lock', self.ha.run_cycle())
 
     @patch('requests.get', requests_get)
     def test_manual_failover_from_leader_in_synchronous_mode(self):
@@ -506,48 +546,48 @@ class TestHa(unittest.TestCase):
         self.ha.is_failover_possible = false
         self.ha.process_sync_replication = Mock()
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, self.p.name, 'a', None), (self.p.name, None))
-        self.assertEqual('no action.  i am the leader with the lock', self.ha.run_cycle())
+        self.assertEquals('no action.  i am the leader with the lock', self.ha.run_cycle())
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, self.p.name, 'a', None), (self.p.name, 'a'))
         self.ha.is_failover_possible = true
-        self.assertEqual('manual failover: demoting myself', self.ha.run_cycle())
+        self.assertEquals('manual failover: demoting myself', self.ha.run_cycle())
 
     @patch('requests.get', requests_get)
     def test_manual_failover_process_no_leader(self):
         self.p.is_leader = false
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, '', self.p.name, None))
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, '', 'leader', None))
         self.p.set_role('replica')
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
         self.ha.fetch_node_status = get_node_status()  # accessible, in_recovery
-        self.assertEqual(self.ha.run_cycle(), 'following a different leader because i am not the healthiest node')
+        self.assertEquals(self.ha.run_cycle(), 'following a different leader because i am not the healthiest node')
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, self.p.name, '', None))
-        self.assertEqual(self.ha.run_cycle(), 'following a different leader because i am not the healthiest node')
+        self.assertEquals(self.ha.run_cycle(), 'following a different leader because i am not the healthiest node')
         self.ha.fetch_node_status = get_node_status(reachable=False)  # inaccessible, in_recovery
         self.p.set_role('replica')
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
         # set failover flag to True for all members of the cluster
         # this should elect the current member, as we are not going to call the API for it.
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, '', 'other', None))
         self.ha.fetch_node_status = get_node_status(nofailover=True)  # accessible, in_recovery
         self.p.set_role('replica')
-        self.assertEqual(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
+        self.assertEquals(self.ha.run_cycle(), 'promoted self to leader by acquiring session lock')
         # same as previous, but set the current member to nofailover. In no case it should be elected as a leader
         self.ha.patroni.nofailover = True
-        self.assertEqual(self.ha.run_cycle(), 'following a different leader because I am not allowed to promote')
+        self.assertEquals(self.ha.run_cycle(), 'following a different leader because I am not allowed to promote')
 
     def test_manual_failover_process_no_leader_in_pause(self):
         self.ha.is_paused = true
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, '', 'other', None))
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: continue to run as master without lock')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: continue to run as master without lock')
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, 'leader', '', None))
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: continue to run as master without lock')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: continue to run as master without lock')
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, 'leader', 'blabla', None))
-        self.assertEqual('PAUSE: acquired session lock as a leader', self.ha.run_cycle())
+        self.assertEquals('PAUSE: acquired session lock as a leader', self.ha.run_cycle())
         self.p.is_leader = false
         self.p.set_role('replica')
         self.ha.cluster = get_cluster_initialized_without_leader(failover=Failover(0, 'leader', self.p.name, None))
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: promoted self to leader by acquiring session lock')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: promoted self to leader by acquiring session lock')
 
     def test_is_healthiest_node(self):
         self.ha.state_handler.is_leader = false
@@ -628,7 +668,7 @@ class TestHa(unittest.TestCase):
     def test_scheduled_restart(self):
         self.ha.cluster = get_cluster_initialized_with_leader()
         with patch.object(self.ha, "evaluate_scheduled_restart", Mock(return_value="restart scheduled")):
-            self.assertEqual(self.ha.run_cycle(), "restart scheduled")
+            self.assertEquals(self.ha.run_cycle(), "restart scheduled")
 
     def test_restart_matches(self):
         self.p._role = 'replica'
@@ -645,79 +685,84 @@ class TestHa(unittest.TestCase):
         self.ha.is_paused = true
         self.p.name = 'leader'
         self.ha.cluster = get_cluster_initialized_with_leader()
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: removed leader lock because postgres is not running as master')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: removed leader lock because postgres is not running as master')
         self.ha.cluster = get_cluster_initialized_with_leader(Failover(0, '', self.p.name, None))
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: waiting to become master after promote...')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: waiting to become master after promote...')
 
     def test_process_healthy_standby_cluster_as_standby_leader(self):
         self.p.is_leader = false
         self.p.name = 'leader'
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
         self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
         msg = 'no action.  i am the standby leader with the lock'
-        self.assertEqual(self.ha.run_cycle(), msg)
+        self.assertEquals(self.ha.run_cycle(), msg)
 
     def test_process_healthy_standby_cluster_as_cascade_replica(self):
         self.p.is_leader = false
         self.p.name = 'replica'
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
         self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
         msg = 'no action.  i am a secondary and i am following a leader'
-        self.assertEqual(self.ha.run_cycle(), msg)
+        self.assertEquals(self.ha.run_cycle(), msg)
 
-    def test_process_unhealthy_standby_cluster_as_standby_leader(self):
+    @patch('patroni.dcs.etcd.Etcd.initialize', return_value=True)
+    def test_process_unhealthy_standby_cluster_as_standby_leader(self, initialize):
         self.p.is_leader = false
         self.p.name = 'leader'
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
         self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
         self.ha.cluster.is_unlocked = true
         self.ha.sysid_valid = true
         self.p._sysid = True
         msg = 'promoted self to a standby leader because i had the session lock'
-        self.assertEqual(self.ha.run_cycle(), msg)
+        self.assertEquals(self.ha.run_cycle(), msg)
 
     @patch.object(Postgresql, 'rewind_needed_and_possible', Mock(return_value=True))
-    def test_process_unhealthy_standby_cluster_as_cascade_replica(self):
+    @patch('patroni.dcs.etcd.Etcd.initialize', return_value=True)
+    def test_process_unhealthy_standby_cluster_as_cascade_replica(self, initialize):
         self.p.is_leader = false
         self.p.name = 'replica'
+        self.ha.patroni.config._dynamic_configuration = {"standby_cluster": {
+            "host": "localhost",
+            "port": 5432,
+            "primary_slot_name": "",
+        }}
         self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
         self.ha.is_unlocked = true
-        self.assertTrue(self.ha.run_cycle().startswith('running pg_rewind from remote_master:'))
-
-    def test_recover_unhealthy_leader_in_standby_cluster(self):
-        self.p.is_leader = false
-        self.p.name = 'leader'
-        self.p.is_running = false
-        self.p.follow = false
-        self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
-        self.assertEqual(self.ha.run_cycle(), 'starting as a standby leader because i had the session lock')
-
-    def test_recover_unhealthy_unlocked_standby_cluster(self):
-        self.p.is_leader = false
-        self.p.name = 'leader'
-        self.p.is_running = false
-        self.p.follow = false
-        self.ha.cluster = get_standby_cluster_initialized_with_only_leader()
-        self.ha.cluster.is_unlocked = true
-        self.ha.has_lock = false
-        self.assertEqual(self.ha.run_cycle(), 'trying to follow a remote master because standby cluster is unhealthy')
+        msg = 'running pg_rewind from leader'
+        self.assertEquals(self.ha.run_cycle(), msg)
 
     def test_failed_to_update_lock_in_pause(self):
         self.ha.update_lock = false
         self.ha.is_paused = true
         self.p.name = 'leader'
         self.ha.cluster = get_cluster_initialized_with_leader()
-        self.assertEqual(self.ha.run_cycle(),
-                         'PAUSE: continue to run as master after failing to update leader lock in DCS')
+        self.assertEquals(self.ha.run_cycle(),
+                          'PAUSE: continue to run as master after failing to update leader lock in DCS')
 
     def test_postgres_unhealthy_in_pause(self):
         self.ha.is_paused = true
         self.p.is_healthy = false
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: postgres is not running')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: postgres is not running')
         self.ha.has_lock = true
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: removed leader lock because postgres is not running')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: removed leader lock because postgres is not running')
 
     def test_no_etcd_connection_in_pause(self):
         self.ha.is_paused = true
         self.ha.load_cluster_from_dcs = Mock(side_effect=DCSError('Etcd is not responding properly'))
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: DCS is not accessible')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: DCS is not accessible')
 
     @patch('patroni.ha.Ha.update_lock', return_value=True)
     @patch('patroni.ha.Ha.demote')
@@ -733,26 +778,26 @@ class TestHa(unittest.TestCase):
         self.ha.cluster = get_cluster_initialized_with_leader()
         self.p.check_for_startup = true
         self.p.time_in_state = lambda: 30
-        self.assertEqual(self.ha.run_cycle(), 'PostgreSQL is still starting up, 270 seconds until timeout')
+        self.assertEquals(self.ha.run_cycle(), 'PostgreSQL is still starting up, 270 seconds until timeout')
         check_calls([(update_lock, True), (demote, False)])
 
         self.p.time_in_state = lambda: 350
         self.ha.fetch_node_status = get_node_status(reachable=False)  # inaccessible, in_recovery
-        self.assertEqual(self.ha.run_cycle(),
-                         'master start has timed out, but continuing to wait because failover is not possible')
+        self.assertEquals(self.ha.run_cycle(),
+                          'master start has timed out, but continuing to wait because failover is not possible')
         check_calls([(update_lock, True), (demote, False)])
 
         self.ha.fetch_node_status = get_node_status()  # accessible, in_recovery
-        self.assertEqual(self.ha.run_cycle(), 'stopped PostgreSQL because of startup timeout')
+        self.assertEquals(self.ha.run_cycle(), 'stopped PostgreSQL because of startup timeout')
         check_calls([(update_lock, True), (demote, True)])
 
         update_lock.return_value = False
-        self.assertEqual(self.ha.run_cycle(), 'stopped PostgreSQL while starting up because leader key was lost')
+        self.assertEquals(self.ha.run_cycle(), 'stopped PostgreSQL while starting up because leader key was lost')
         check_calls([(update_lock, True), (demote, True)])
 
         self.ha.has_lock = false
         self.p.is_leader = false
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am a secondary and i am following a leader')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am a secondary and i am following a leader')
         check_calls([(update_lock, False), (demote, False)])
 
     def test_manual_failover_while_starting(self):
@@ -761,7 +806,7 @@ class TestHa(unittest.TestCase):
         f = Failover(0, self.p.name, '', None)
         self.ha.cluster = get_cluster_initialized_with_leader(f)
         self.ha.fetch_node_status = get_node_status()  # accessible, in_recovery
-        self.assertEqual(self.ha.run_cycle(), 'manual failover: demoting myself')
+        self.assertEquals(self.ha.run_cycle(), 'manual failover: demoting myself')
 
     @patch('patroni.ha.Ha.demote')
     def test_failover_immediately_on_zero_master_start_timeout(self, demote):
@@ -772,7 +817,7 @@ class TestHa(unittest.TestCase):
         self.ha.has_lock = true
         self.ha.update_lock = true
         self.ha.fetch_node_status = get_node_status()  # accessible, in_recovery
-        self.assertEqual(self.ha.run_cycle(), 'stopped PostgreSQL to fail over after a crash')
+        self.assertEquals(self.ha.run_cycle(), 'stopped PostgreSQL to fail over after a crash')
         demote.assert_called_once()
 
     @patch('patroni.postgresql.Postgresql.follow')
@@ -834,18 +879,18 @@ class TestHa(unittest.TestCase):
         self.p.pick_synchronous_standby = Mock(return_value=('other2', True))
         self.ha.run_cycle()
         self.ha.dcs.get_cluster.assert_called_once()
-        self.assertEqual(self.ha.dcs.write_sync_state.call_count, 2)
+        self.assertEquals(self.ha.dcs.write_sync_state.call_count, 2)
 
         # Test updating sync standby key failed due to race
         self.ha.dcs.write_sync_state = Mock(side_effect=[True, False])
         self.ha.run_cycle()
-        self.assertEqual(self.ha.dcs.write_sync_state.call_count, 2)
+        self.assertEquals(self.ha.dcs.write_sync_state.call_count, 2)
 
         # Test changing sync standby failed due to race
         self.ha.dcs.write_sync_state = Mock(return_value=True)
         self.ha.dcs.get_cluster = Mock(return_value=get_cluster_initialized_with_leader(sync=('somebodyelse', None)))
         self.ha.run_cycle()
-        self.assertEqual(self.ha.dcs.write_sync_state.call_count, 1)
+        self.assertEquals(self.ha.dcs.write_sync_state.call_count, 1)
 
         # Test sync set to '*' when synchronous_mode_strict is enabled
         mock_set_sync.reset_mock()
@@ -866,7 +911,7 @@ class TestHa(unittest.TestCase):
         self.ha.cluster = get_cluster_initialized_with_leader(sync=('other', None))
 
         # When we just became master nobody is sync
-        self.assertEqual(self.ha.enforce_master_role('msg', 'promote msg'), 'promote msg')
+        self.assertEquals(self.ha.enforce_master_role('msg', 'promote msg'), 'promote msg')
         mock_set_sync.assert_called_once_with(None)
         mock_write_sync.assert_called_once_with('leader', None, index=0)
 
@@ -894,7 +939,7 @@ class TestHa(unittest.TestCase):
         self.ha.run_cycle()
         mock_acquire.assert_not_called()
         mock_follow.assert_called_once()
-        self.assertEqual(mock_follow.call_args[0][0], None)
+        self.assertEquals(mock_follow.call_args[0][0], None)
         mock_write_sync.assert_not_called()
 
         mock_follow.reset_mock()
@@ -945,15 +990,15 @@ class TestHa(unittest.TestCase):
 
     def test_effective_tags(self):
         self.ha._disable_sync = True
-        self.assertEqual(self.ha.get_effective_tags(), {'foo': 'bar', 'nosync': True})
+        self.assertEquals(self.ha.get_effective_tags(), {'foo': 'bar', 'nosync': True})
         self.ha._disable_sync = False
-        self.assertEqual(self.ha.get_effective_tags(), {'foo': 'bar'})
+        self.assertEquals(self.ha.get_effective_tags(), {'foo': 'bar'})
 
     def test_restore_cluster_config(self):
         self.ha.cluster.config.data.clear()
         self.ha.has_lock = true
         self.ha.cluster.is_unlocked = false
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
 
     def test_watch(self):
         self.ha.cluster = get_cluster_initialized_with_leader()
@@ -972,19 +1017,19 @@ class TestHa(unittest.TestCase):
         self.ha.cluster = get_cluster_initialized_with_leader()
         self.ha.has_lock = true
         self.p.data_directory_empty = true
-        self.assertEqual(self.ha.run_cycle(), 'released leader key voluntarily as data dir empty and currently leader')
-        self.assertEqual(self.p.role, 'uninitialized')
+        self.assertEquals(self.ha.run_cycle(), 'released leader key voluntarily as data dir empty and currently leader')
+        self.assertEquals(self.p.role, 'uninitialized')
 
         # as has_lock is mocked out, we need to fake the leader key release
         self.ha.has_lock = false
         # will not say bootstrap from leader as replica can't self elect
-        self.assertEqual(self.ha.run_cycle(), "trying to bootstrap from replica 'other'")
+        self.assertEquals(self.ha.run_cycle(), "trying to bootstrap from replica 'other'")
 
     def test_update_cluster_history(self):
         self.p.get_master_timeline = Mock(return_value=1)
         self.ha.has_lock = true
         self.ha.cluster.is_unlocked = false
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
 
     @patch('sys.exit', return_value=1)
     def test_abort_join(self, exit_mock):
@@ -997,15 +1042,6 @@ class TestHa(unittest.TestCase):
         self.ha.has_lock = true
         self.ha.cluster.is_unlocked = false
         self.ha.is_paused = true
-        self.assertEqual(self.ha.run_cycle(), 'PAUSE: no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'PAUSE: no action.  i am the leader with the lock')
         self.ha.is_paused = false
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
-
-    @patch('psycopg2.connect', psycopg2_connect)
-    def test_permanent_logical_slots_after_promote(self):
-        config = ClusterConfig(1, {'slots': {'l': {'database': 'postgres', 'plugin': 'test_decoding'}}}, 1)
-        self.ha.cluster = get_cluster_initialized_without_leader(cluster_config=config)
-        self.assertEqual(self.ha.run_cycle(), 'acquired session lock as a leader')
-        self.ha.cluster = get_cluster_initialized_without_leader(leader=True, cluster_config=config)
-        self.ha.has_lock = true
-        self.assertEqual(self.ha.run_cycle(), 'no action.  i am the leader with the lock')
+        self.assertEquals(self.ha.run_cycle(), 'no action.  i am the leader with the lock')

tests/test_kubernetes.py

@@ -50,13 +50,6 @@ class TestKubernetes(unittest.TestCase):
                         'labels': {'f': 'b'}, 'use_endpoints': True, 'pod_ip': '10.0.0.0'})
         self.assertIsNotNone(k.update_leader('123'))
 
-    @patch('kubernetes.config.load_kube_config', Mock())
-    @patch.object(k8s_client.CoreV1Api, 'create_namespaced_endpoints', Mock())
-    def test_update_leader_with_restricted_access(self):
-        k = Kubernetes({'ttl': 30, 'scope': 'test', 'name': 'p-0', 'retry_timeout': 10,
-                        'labels': {'f': 'b'}, 'use_endpoints': True, 'pod_ip': '10.0.0.0'})
-        self.assertIsNotNone(k.update_leader('123', True))
-
     def test_take_leader(self):
         self.k.take_leader()
         self.k._leader_observed_record['leader'] = 'test'

tests/test_patroni.py

@@ -73,7 +73,7 @@ class TestPatroni(unittest.TestCase):
         mock_getpid.return_value = 2
         _main()
 
-        with patch('sys.frozen', Mock(return_value=True), create=True), patch('os.setsid', Mock()):
+        with patch('sys.frozen', Mock(return_value=True), create=True):
             sys.argv = ['/patroni', 'pg_ctl_start', 'postgres', '-D', '/data', '--max_connections=100']
             _main()
 

tests/test_postgresql.py

@@ -8,7 +8,7 @@ import unittest
 
 from mock import Mock, MagicMock, PropertyMock, patch, mock_open
 from patroni.async_executor import CriticalTask
-from patroni.dcs import Cluster, ClusterConfig, Leader, Member, RemoteMember, SyncState
+from patroni.dcs import Cluster, Leader, Member, RemoteMember, SyncState
 from patroni.exceptions import PostgresConnectionException, PostgresException
 from patroni.postgresql import Postgresql, STATE_REJECT, STATE_NO_RESPONSE
 from patroni.postmaster import PostmasterProcess
@@ -28,15 +28,15 @@ class MockCursor(object):
     def execute(self, sql, *params):
         if sql.startswith('blabla'):
             raise psycopg2.ProgrammingError()
-        elif sql == 'CHECKPOINT' or sql.startswith('SELECT pg_catalog.pg_create_'):
+        elif sql == 'CHECKPOINT':
             raise psycopg2.OperationalError()
         elif sql.startswith('RetryFailedError'):
             raise RetryFailedError('retry')
         elif sql.startswith('SELECT slot_name'):
-            self.results = [('blabla', 'physical'), ('foobar', 'physical'), ('ls', 'logical', 'a', 'b')]
-        elif sql.startswith('SELECT CASE WHEN pg_catalog.pg_is_in_recovery()'):
+            self.results = [('blabla',), ('foobar',)]
+        elif sql.startswith('SELECT CASE WHEN pg_is_in_recovery()'):
             self.results = [(1, 2)]
-        elif sql.startswith('SELECT pg_catalog.pg_is_in_recovery()'):
+        elif sql.startswith('SELECT pg_is_in_recovery()'):
             self.results = [(False, 2)]
         elif sql.startswith('WITH replication_info AS ('):
             replication_info = '[{"application_name":"walreceiver","client_addr":"1.2.3.4",' +\
@@ -53,7 +53,7 @@ class MockCursor(object):
             self.results = [('1', 2, '0/402EEC0', '')]
         elif sql.startswith('SELECT isdir, modification'):
             self.results = [(False, datetime.datetime.now())]
-        elif sql.startswith('SELECT pg_catalog.pg_read_file'):
+        elif sql.startswith('SELECT pg_read_file'):
             self.results = [('1\t0/40159C0\tno recovery target specified\n\n' +
                              '2\t1/40159C0\tno recovery target specified\n',)]
         elif sql.startswith('TIMELINE_HISTORY '):
@@ -308,7 +308,7 @@ class TestPostgresql(unittest.TestCase):
     def test_restart(self):
         self.p.start = Mock(return_value=False)
         self.assertFalse(self.p.restart())
-        self.assertEqual(self.p.state, 'restart failed (restarting)')
+        self.assertEquals(self.p.state, 'restart failed (restarting)')
 
     @patch.object(builtins, 'open', MagicMock())
     def test_write_pgpass(self):
@@ -317,10 +317,10 @@ class TestPostgresql(unittest.TestCase):
 
     def test_checkpoint(self):
         with patch.object(MockCursor, 'fetchone', Mock(return_value=(True, ))):
-            self.assertEqual(self.p.checkpoint({'user': 'postgres'}), 'is_in_recovery=true')
+            self.assertEquals(self.p.checkpoint({'user': 'postgres'}), 'is_in_recovery=true')
         with patch.object(MockCursor, 'execute', Mock(return_value=None)):
             self.assertIsNone(self.p.checkpoint())
-        self.assertEqual(self.p.checkpoint(), 'not accessible or not healty')
+        self.assertEquals(self.p.checkpoint(), 'not accessible or not healty')
 
     @patch.object(Postgresql, 'cancellable_subprocess_call')
     @patch('patroni.postgresql.Postgresql.write_pgpass', MagicMock(return_value=dict()))
@@ -401,8 +401,7 @@ class TestPostgresql(unittest.TestCase):
     @patch.object(Postgresql, 'is_running', Mock(return_value=False))
     @patch.object(Postgresql, 'start', Mock())
     def test_follow(self):
-        m = RemoteMember('1', {'restore_command': '2', 'recovery_min_apply_delay': 3, 'archive_cleanup_command': '4'})
-        self.p.follow(m)
+        self.p.follow(RemoteMember('123', {'recovery_command': 'foo'}))
 
     @patch('subprocess.check_output', Mock(return_value=0, side_effect=pg_controldata_string))
     def test_can_rewind(self):
@@ -421,20 +420,16 @@ class TestPostgresql(unittest.TestCase):
     def test_create_replica(self, mock_cancellable_subprocess_call):
         self.p.delete_trigger_file = Mock(side_effect=OSError)
 
-        self.p.config['create_replica_methods'] = ['pgBackRest']
-        self.p.config['pgBackRest'] = {'command': 'pgBackRest', 'keep_data': True, 'no_params': True}
-        mock_cancellable_subprocess_call.return_value = 0
-        self.assertEqual(self.p.create_replica(self.leader), 0)
-
         self.p.config['create_replica_methods'] = ['wale', 'basebackup']
         self.p.config['wale'] = {'command': 'foo'}
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        mock_cancellable_subprocess_call.return_value = 0
+        self.assertEquals(self.p.create_replica(self.leader), 0)
         del self.p.config['wale']
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         self.p.config['create_replica_methods'] = ['basebackup']
         self.p.config['basebackup'] = [{'max_rate': '100M'}, 'no-sync']
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         self.p.config['basebackup'] = [{'max_rate': '100M', 'compress': '9'}]
         with mock.patch('patroni.postgresql.logger.error', new_callable=Mock()) as mock_logger:
@@ -451,24 +446,24 @@ class TestPostgresql(unittest.TestCase):
                             "not matching {0}".format(mock_logger.call_args[0][0]))
 
         self.p.config['basebackup'] = {"foo": "bar"}
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         self.p.config['create_replica_methods'] = ['wale', 'basebackup']
         del self.p.config['basebackup']
         mock_cancellable_subprocess_call.return_value = 1
-        self.assertEqual(self.p.create_replica(self.leader), 1)
+        self.assertEquals(self.p.create_replica(self.leader), 1)
 
         mock_cancellable_subprocess_call.side_effect = Exception('foo')
-        self.assertEqual(self.p.create_replica(self.leader), 1)
+        self.assertEquals(self.p.create_replica(self.leader), 1)
 
         mock_cancellable_subprocess_call.side_effect = [1, 0]
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         mock_cancellable_subprocess_call.side_effect = [Exception(), 0]
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         self.p.cancel()
-        self.assertEqual(self.p.create_replica(self.leader), 1)
+        self.assertEquals(self.p.create_replica(self.leader), 1)
 
     @patch('time.sleep', Mock())
     @patch.object(Postgresql, 'cancellable_subprocess_call')
@@ -482,18 +477,18 @@ class TestPostgresql(unittest.TestCase):
         self.p.config['create_replica_method'] = ['wale', 'basebackup']
         self.p.config['wale'] = {'command': 'foo'}
         mock_cancellable_subprocess_call.return_value = 0
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
         del self.p.config['wale']
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         self.p.config['create_replica_method'] = ['basebackup']
         self.p.config['basebackup'] = [{'max_rate': '100M'}, 'no-sync']
-        self.assertEqual(self.p.create_replica(self.leader), 0)
+        self.assertEquals(self.p.create_replica(self.leader), 0)
 
         self.p.config['create_replica_method'] = ['wale', 'basebackup']
         del self.p.config['basebackup']
         mock_cancellable_subprocess_call.return_value = 1
-        self.assertEqual(self.p.create_replica(self.leader), 1)
+        self.assertEquals(self.p.create_replica(self.leader), 1)
 
     def test_basebackup(self):
         self.p.cancel()
@@ -502,25 +497,23 @@ class TestPostgresql(unittest.TestCase):
     @patch.object(Postgresql, 'is_running', Mock(return_value=True))
     def test_sync_replication_slots(self):
         self.p.start()
-        config = ClusterConfig(1, {'slots': {'ls': {'database': 'a', 'plugin': 'b'},
-                                             'A': 0, 'test_3': 0, 'b': {'type': 'logical', 'plugin': '1'}}}, 1)
-        cluster = Cluster(True, config, self.leader, 0, [self.me, self.other, self.leadermem], None, None, None)
+        cluster = Cluster(True, None, self.leader, 0, [self.me, self.other, self.leadermem], None, None, None)
         with mock.patch('patroni.postgresql.Postgresql._query', Mock(side_effect=psycopg2.OperationalError)):
             self.p.sync_replication_slots(cluster)
         self.p.sync_replication_slots(cluster)
         with mock.patch('patroni.postgresql.Postgresql.role', new_callable=PropertyMock(return_value='replica')):
             self.p.sync_replication_slots(cluster)
-        with patch.object(Postgresql, 'drop_replication_slot', Mock(return_value=True)),\
-                patch('patroni.dcs.logger.error', new_callable=Mock()) as errorlog_mock:
+        with mock.patch('patroni.postgresql.logger.error', new_callable=Mock()) as errorlog_mock:
             self.p.query = Mock()
             alias1 = Member(0, 'test-3', 28, {'conn_url': 'postgres://replicator:[email protected]:5436/postgres'})
             alias2 = Member(0, 'test.3', 28, {'conn_url': 'postgres://replicator:[email protected]:5436/postgres'})
             cluster.members.extend([alias1, alias2])
             self.p.sync_replication_slots(cluster)
-            self.assertEqual(errorlog_mock.call_count, 5)
-            ca = errorlog_mock.call_args_list[0][0][1]
-            self.assertTrue("test-3" in ca, "non matching {0}".format(ca))
-            self.assertTrue("test.3" in ca, "non matching {0}".format(ca))
+            errorlog_mock.assert_called_once()
+            self.assertTrue("test-3" in errorlog_mock.call_args[0][1],
+                            "non matching {0}".format(errorlog_mock.call_args[0][1]))
+            self.assertTrue("test.3" in errorlog_mock.call_args[0][1],
+                            "non matching {0}".format(errorlog_mock.call_args[0][1]))
 
     @patch.object(MockCursor, 'execute', Mock(side_effect=psycopg2.OperationalError))
     def test__query(self):
@@ -556,25 +549,25 @@ class TestPostgresql(unittest.TestCase):
         self.assertTrue(self.p.promote(0))
 
     def test_timeline_wal_position(self):
-        self.assertEqual(self.p.timeline_wal_position(), (1, 2))
+        self.assertEquals(self.p.timeline_wal_position(), (1, 2))
         Thread(target=self.p.timeline_wal_position).start()
 
     @patch.object(PostmasterProcess, 'from_pidfile')
     def test_is_running(self, mock_frompidfile):
         # Cached postmaster running
         mock_postmaster = self.p._postmaster_proc = MockPostmaster()
-        self.assertEqual(self.p.is_running(), mock_postmaster)
+        self.assertEquals(self.p.is_running(), mock_postmaster)
 
         # Cached postmaster not running, no postmaster running
         mock_postmaster.is_running.return_value = False
         mock_frompidfile.return_value = None
-        self.assertEqual(self.p.is_running(), None)
-        self.assertEqual(self.p._postmaster_proc, None)
+        self.assertEquals(self.p.is_running(), None)
+        self.assertEquals(self.p._postmaster_proc, None)
 
         # No cached postmaster, postmaster running
         mock_frompidfile.return_value = mock_postmaster2 = MockPostmaster()
-        self.assertEqual(self.p.is_running(), mock_postmaster2)
-        self.assertEqual(self.p._postmaster_proc, mock_postmaster2)
+        self.assertEquals(self.p.is_running(), mock_postmaster2)
+        self.assertEquals(self.p._postmaster_proc, mock_postmaster2)
 
     @patch('shlex.split', Mock(side_effect=OSError))
     def test_call_nowait(self):
@@ -693,13 +686,13 @@ class TestPostgresql(unittest.TestCase):
         mock_cancellable_subprocess_call.assert_called()
         args, kwargs = mock_cancellable_subprocess_call.call_args
         self.assertTrue('PGPASSFILE' in kwargs['env'])
-        self.assertEqual(args[0], ['/bin/false', 'postgres://127.0.0.2:5432/postgres'])
+        self.assertEquals(args[0], ['/bin/false', 'postgres://127.0.0.2:5432/postgres'])
 
         mock_cancellable_subprocess_call.reset_mock()
         self.p._local_address.pop('host')
         self.assertTrue(self.p.run_bootstrap_post_init({'post_init': '/bin/false'}))
         mock_cancellable_subprocess_call.assert_called()
-        self.assertEqual(mock_cancellable_subprocess_call.call_args[0][0], ['/bin/false', 'postgres://:5432/postgres'])
+        self.assertEquals(mock_cancellable_subprocess_call.call_args[0][0], ['/bin/false', 'postgres://:5432/postgres'])
 
         mock_cancellable_subprocess_call.side_effect = OSError
         self.assertFalse(self.p.run_bootstrap_post_init({'post_init': '/bin/false'}))
@@ -711,7 +704,7 @@ class TestPostgresql(unittest.TestCase):
     @patch('os.listdir', Mock(return_value=['recovery.conf']))
     @patch('os.path.exists', Mock(return_value=True))
     def test_get_postgres_role_from_data_directory(self):
-        self.assertEqual(self.p.get_postgres_role_from_data_directory(), 'replica')
+        self.assertEquals(self.p.get_postgres_role_from_data_directory(), 'replica')
 
     def test_remove_data_directory(self):
         self.p.remove_data_directory()
@@ -726,13 +719,13 @@ class TestPostgresql(unittest.TestCase):
     def test_controldata(self):
         with patch('subprocess.check_output', Mock(return_value=0, side_effect=pg_controldata_string)):
             data = self.p.controldata()
-            self.assertEqual(len(data), 50)
-            self.assertEqual(data['Database cluster state'], 'shut down in recovery')
-            self.assertEqual(data['wal_log_hints setting'], 'on')
-            self.assertEqual(int(data['Database block size']), 8192)
+            self.assertEquals(len(data), 50)
+            self.assertEquals(data['Database cluster state'], 'shut down in recovery')
+            self.assertEquals(data['wal_log_hints setting'], 'on')
+            self.assertEquals(int(data['Database block size']), 8192)
 
         with patch('subprocess.check_output', Mock(side_effect=subprocess.CalledProcessError(1, ''))):
-            self.assertEqual(self.p.controldata(), {})
+            self.assertEquals(self.p.controldata(), {})
 
     @patch('patroni.postgresql.Postgresql._version_file_exists', Mock(return_value=True))
     @patch('subprocess.check_output', MagicMock(return_value=0, side_effect=pg_controldata_string))
@@ -786,9 +779,9 @@ class TestPostgresql(unittest.TestCase):
     @patch.object(Postgresql, '_version_file_exists', Mock(return_value=True))
     def test_get_major_version(self):
         with patch.object(builtins, 'open', mock_open(read_data='9.4')):
-            self.assertEqual(self.p.get_major_version(), 90400)
+            self.assertEquals(self.p.get_major_version(), 90400)
         with patch.object(builtins, 'open', Mock(side_effect=Exception)):
-            self.assertEqual(self.p.get_major_version(), 0)
+            self.assertEquals(self.p.get_major_version(), 0)
 
     def test_postmaster_start_time(self):
         with patch.object(MockCursor, "fetchone", Mock(return_value=('foo', True, '', '', '', '', False))):
@@ -800,31 +793,31 @@ class TestPostgresql(unittest.TestCase):
         with patch('subprocess.call', return_value=0):
             self.p._state = 'starting'
             self.assertFalse(self.p.check_for_startup())
-            self.assertEqual(self.p.state, 'running')
+            self.assertEquals(self.p.state, 'running')
 
         with patch('subprocess.call', return_value=1):
             self.p._state = 'starting'
             self.assertTrue(self.p.check_for_startup())
-            self.assertEqual(self.p.state, 'starting')
+            self.assertEquals(self.p.state, 'starting')
 
         with patch('subprocess.call', return_value=2):
             self.p._state = 'starting'
             self.assertFalse(self.p.check_for_startup())
-            self.assertEqual(self.p.state, 'start failed')
+            self.assertEquals(self.p.state, 'start failed')
 
         with patch('subprocess.call', return_value=0):
             self.p._state = 'running'
             self.assertFalse(self.p.check_for_startup())
-            self.assertEqual(self.p.state, 'running')
+            self.assertEquals(self.p.state, 'running')
 
         with patch('subprocess.call', return_value=127):
             self.p._state = 'running'
             self.assertFalse(self.p.check_for_startup())
-            self.assertEqual(self.p.state, 'running')
+            self.assertEquals(self.p.state, 'running')
 
             self.p._state = 'starting'
             self.assertFalse(self.p.check_for_startup())
-            self.assertEqual(self.p.state, 'running')
+            self.assertEquals(self.p.state, 'running')
 
     def test_wait_for_startup(self):
         state = {'sleeps': 0, 'num_rejects': 0, 'final_return': 0}
@@ -849,12 +842,12 @@ class TestPostgresql(unittest.TestCase):
 
                 self.p._state = 'stopped'
                 self.assertTrue(self.p.wait_for_startup())
-                self.assertEqual(state['sleeps'], 0)
+                self.assertEquals(state['sleeps'], 0)
 
                 self.p._state = 'starting'
                 state['num_rejects'] = 5
                 self.assertTrue(self.p.wait_for_startup())
-                self.assertEqual(state['sleeps'], 5)
+                self.assertEquals(state['sleeps'], 5)
 
                 self.p._state = 'starting'
                 state['sleeps'] = 0
@@ -865,7 +858,7 @@ class TestPostgresql(unittest.TestCase):
                 state['sleeps'] = 0
                 state['final_return'] = 0
                 self.assertFalse(self.p.wait_for_startup(timeout=2))
-                self.assertEqual(state['sleeps'], 3)
+                self.assertEquals(state['sleeps'], 3)
 
         with patch.object(Postgresql, 'check_startup_state_changed', Mock(return_value=False)):
             self.p.cancel()
@@ -881,30 +874,30 @@ class TestPostgresql(unittest.TestCase):
                     (self.me.name, 'streaming', 'async'),
                     (self.other.name, 'streaming', 'async'),
                 ]):
-            self.assertEqual(self.p.pick_synchronous_standby(cluster), (self.leadermem.name, True))
+            self.assertEquals(self.p.pick_synchronous_standby(cluster), (self.leadermem.name, True))
 
         with patch.object(Postgresql, "query", return_value=[
                     (self.me.name, 'streaming', 'async'),
                     (self.leadermem.name, 'streaming', 'potential'),
                     (self.other.name, 'streaming', 'async'),
                 ]):
-            self.assertEqual(self.p.pick_synchronous_standby(cluster), (self.leadermem.name, False))
+            self.assertEquals(self.p.pick_synchronous_standby(cluster), (self.leadermem.name, False))
 
         with patch.object(Postgresql, "query", return_value=[
                     (self.me.name, 'streaming', 'async'),
                     (self.other.name, 'streaming', 'async'),
                 ]):
-            self.assertEqual(self.p.pick_synchronous_standby(cluster), (self.me.name, False))
+            self.assertEquals(self.p.pick_synchronous_standby(cluster), (self.me.name, False))
 
         with patch.object(Postgresql, "query", return_value=[
                     ('missing', 'streaming', 'sync'),
                     (self.me.name, 'streaming', 'async'),
                     (self.other.name, 'streaming', 'async'),
                 ]):
-            self.assertEqual(self.p.pick_synchronous_standby(cluster), (self.me.name, False))
+            self.assertEquals(self.p.pick_synchronous_standby(cluster), (self.me.name, False))
 
         with patch.object(Postgresql, "query", return_value=[]):
-            self.assertEqual(self.p.pick_synchronous_standby(cluster), (None, False))
+            self.assertEquals(self.p.pick_synchronous_standby(cluster), (None, False))
 
     def test_set_sync_standby(self):
         def value_in_conf():
@@ -915,22 +908,22 @@ class TestPostgresql(unittest.TestCase):
 
         mock_reload = self.p.reload = Mock()
         self.p.set_synchronous_standby('n1')
-        self.assertEqual(value_in_conf(), "synchronous_standby_names = 'n1'")
+        self.assertEquals(value_in_conf(), "synchronous_standby_names = 'n1'")
         mock_reload.assert_called()
 
         mock_reload.reset_mock()
         self.p.set_synchronous_standby('n1')
         mock_reload.assert_not_called()
-        self.assertEqual(value_in_conf(), "synchronous_standby_names = 'n1'")
+        self.assertEquals(value_in_conf(), "synchronous_standby_names = 'n1'")
 
         self.p.set_synchronous_standby('n2')
         mock_reload.assert_called()
-        self.assertEqual(value_in_conf(), "synchronous_standby_names = 'n2'")
+        self.assertEquals(value_in_conf(), "synchronous_standby_names = 'n2'")
 
         mock_reload.reset_mock()
         self.p.set_synchronous_standby(None)
         mock_reload.assert_called()
-        self.assertEqual(value_in_conf(), None)
+        self.assertEquals(value_in_conf(), None)
 
     def test_get_server_parameters(self):
         config = {'synchronous_mode': True, 'parameters': {'wal_level': 'hot_standby'}, 'listen': '0'}
@@ -964,8 +957,8 @@ class TestPostgresql(unittest.TestCase):
 "--wal_log_hints=on" "--max_wal_senders=5" "--max_replication_slots=5"\n')
         with patch.object(builtins, 'open', m):
             data = self.p.read_postmaster_opts()
-            self.assertEqual(data['wal_level'], 'hot_standby')
-            self.assertEqual(int(data['max_replication_slots']), 5)
+            self.assertEquals(data['wal_level'], 'hot_standby')
+            self.assertEquals(int(data['max_replication_slots']), 5)
             self.assertEqual(data.get('D'), None)
 
             m.side_effect = IOError
@@ -975,7 +968,7 @@ class TestPostgresql(unittest.TestCase):
     @patch('subprocess.Popen')
     def test_single_user_mode(self, subprocess_popen_mock):
         subprocess_popen_mock.return_value.wait.return_value = 0
-        self.assertEqual(self.p.single_user_mode('CHECKPOINT', {'archive_mode': 'on'}), 0)
+        self.assertEquals(self.p.single_user_mode('CHECKPOINT', {'archive_mode': 'on'}), 0)
 
     @patch('os.listdir', Mock(side_effect=[OSError, ['a', 'b']]))
     @patch('os.unlink', Mock(side_effect=OSError))
@@ -993,10 +986,10 @@ class TestPostgresql(unittest.TestCase):
         self.assertTrue(self.p.fix_cluster_state())
 
     def test_replica_cached_timeline(self):
-        self.assertEqual(self.p.replica_cached_timeline(1), 2)
+        self.assertEquals(self.p.replica_cached_timeline(1), 2)
 
     def test_get_master_timeline(self):
-        self.assertEqual(self.p.get_master_timeline(), 1)
+        self.assertEquals(self.p.get_master_timeline(), 1)
 
     def test_cancellable_subprocess_call(self):
         self.p.cancel()

tests/test_postmaster.py

@@ -46,7 +46,7 @@ class TestPostmasterProcess(unittest.TestCase):
     @patch('psutil.Process.__init__')
     def test_from_pid(self, mock_init):
         mock_init.side_effect = psutil.NoSuchProcess(123)
-        self.assertEqual(PostmasterProcess.from_pid(123), None)
+        self.assertEquals(PostmasterProcess.from_pid(123), None)
         mock_init.side_effect = None
         self.assertNotEquals(PostmasterProcess.from_pid(123), None)
 
@@ -55,13 +55,13 @@ class TestPostmasterProcess(unittest.TestCase):
     @patch('psutil.Process.pid', Mock(return_value=123))
     def test_signal_stop(self, mock_send_signal):
         proc = PostmasterProcess(-123)
-        self.assertEqual(proc.signal_stop('immediate'), False)
+        self.assertEquals(proc.signal_stop('immediate'), False)
 
         mock_send_signal.side_effect = [None, psutil.NoSuchProcess(123), psutil.AccessDenied()]
         proc = PostmasterProcess(123)
-        self.assertEqual(proc.signal_stop('immediate'), None)
-        self.assertEqual(proc.signal_stop('immediate'), True)
-        self.assertEqual(proc.signal_stop('immediate'), False)
+        self.assertEquals(proc.signal_stop('immediate'), None)
+        self.assertEquals(proc.signal_stop('immediate'), True)
+        self.assertEquals(proc.signal_stop('immediate'), False)
 
     @patch('psutil.Process.__init__', Mock())
     @patch('psutil.wait_procs')
@@ -89,11 +89,11 @@ class TestPostmasterProcess(unittest.TestCase):
         mock_frompidfile.return_value._is_postmaster_process.return_value = False
         mock_frompid.return_value = "proc 123"
         mock_popen.return_value.stdout.readline.return_value = '123'
-        self.assertEqual(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []), "proc 123")
+        self.assertEquals(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []), "proc 123")
         mock_frompid.assert_called_with(123)
 
         mock_frompidfile.side_effect = psutil.NoSuchProcess(123)
-        self.assertEqual(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []), "proc 123")
+        self.assertEquals(PostmasterProcess.start('true', '/tmp', '/tmp/test.conf', []), "proc 123")
 
     @patch('psutil.Process.__init__', Mock(side_effect=psutil.NoSuchProcess(123)))
     def test_read_postmaster_pidfile(self):

tests/test_utils.py

@@ -8,7 +8,7 @@ from patroni.utils import Retry, RetryFailedError, polling_loop
 class TestUtils(unittest.TestCase):
 
     def test_polling_loop(self):
-        self.assertEqual(list(polling_loop(0.001, interval=0.001)), [0])
+        self.assertEquals(list(polling_loop(0.001, interval=0.001)), [0])
 
 
 @patch('time.sleep', Mock())
@@ -29,21 +29,21 @@ class TestRetrySleeper(unittest.TestCase):
     def test_reset(self):
         retry = Retry(delay=0, max_tries=2)
         retry(self._fail())
-        self.assertEqual(retry._attempts, 1)
+        self.assertEquals(retry._attempts, 1)
         retry.reset()
-        self.assertEqual(retry._attempts, 0)
+        self.assertEquals(retry._attempts, 0)
 
     def test_too_many_tries(self):
         retry = Retry(delay=0)
         self.assertRaises(RetryFailedError, retry, self._fail(times=999))
-        self.assertEqual(retry._attempts, 1)
+        self.assertEquals(retry._attempts, 1)
 
     def test_maximum_delay(self):
         retry = Retry(delay=10, max_tries=100)
         retry(self._fail(times=10))
         self.assertTrue(retry._cur_delay < 4000, retry._cur_delay)
         # gevent's sleep function is picky about the type
-        self.assertEqual(type(retry._cur_delay), float)
+        self.assertEquals(type(retry._cur_delay), float)
 
     def test_deadline(self):
         retry = Retry(deadline=0.0001)

tests/test_watchdog.py

@@ -73,14 +73,14 @@ class TestWatchdog(unittest.TestCase):
     @patch.object(LinuxWatchdogDevice, 'can_be_disabled', PropertyMock(return_value=True))
     def test_unsafe_timeout_disable_watchdog_and_exit(self):
         watchdog = Watchdog({'ttl': 30, 'loop_wait': 15, 'watchdog': {'mode': 'required', 'safety_margin': -1}})
-        self.assertEqual(watchdog.activate(), False)
-        self.assertEqual(watchdog.is_running, False)
+        self.assertEquals(watchdog.activate(), False)
+        self.assertEquals(watchdog.is_running, False)
 
     @patch('platform.system', Mock(return_value='Linux'))
     @patch.object(LinuxWatchdogDevice, 'get_timeout', Mock(return_value=16))
     def test_timeout_does_not_ensure_safe_termination(self):
         Watchdog({'ttl': 30, 'loop_wait': 15, 'watchdog': {'mode': 'auto', 'safety_margin': -1}}).activate()
-        self.assertEqual(len(mock_devices), 2)
+        self.assertEquals(len(mock_devices), 2)
 
     @patch('platform.system', Mock(return_value='Linux'))
     @patch.object(Watchdog, 'is_running', PropertyMock(return_value=False))
@@ -99,29 +99,29 @@ class TestWatchdog(unittest.TestCase):
         watchdog = Watchdog({'ttl': 30, 'loop_wait': 10, 'watchdog': {'mode': 'required'}})
         watchdog.activate()
 
-        self.assertEqual(len(mock_devices), 2)
+        self.assertEquals(len(mock_devices), 2)
         device = mock_devices[-1]
         self.assertTrue(device.open)
 
-        self.assertEqual(device.timeout, 24)
+        self.assertEquals(device.timeout, 24)
 
         watchdog.keepalive()
-        self.assertEqual(len(device.writes), 1)
+        self.assertEquals(len(device.writes), 1)
 
         watchdog.disable()
         self.assertFalse(device.open)
-        self.assertEqual(device.writes[-1], b'V')
+        self.assertEquals(device.writes[-1], b'V')
 
     def test_invalid_timings(self):
         watchdog = Watchdog({'ttl': 30, 'loop_wait': 20, 'watchdog': {'mode': 'automatic', 'safety_margin': -1}})
         watchdog.activate()
-        self.assertEqual(len(mock_devices), 1)
+        self.assertEquals(len(mock_devices), 1)
         self.assertFalse(watchdog.is_running)
 
     def test_parse_mode(self):
         with patch('patroni.watchdog.base.logger.warning', new_callable=Mock()) as warning_mock:
             watchdog = Watchdog({'ttl': 30, 'loop_wait': 10, 'watchdog': {'mode': 'bad'}})
-            self.assertEqual(watchdog.config.mode, 'off')
+            self.assertEquals(watchdog.config.mode, 'off')
             warning_mock.assert_called_once()
 
     @patch('platform.system', Mock(return_value='Unknown'))
@@ -170,7 +170,7 @@ class TestNullWatchdog(unittest.TestCase):
         watchdog = NullWatchdog()
         self.assertTrue(watchdog.can_be_disabled)
         self.assertRaises(WatchdogError, watchdog.set_timeout, 1)
-        self.assertEqual(watchdog.describe(), 'NullWatchdog')
+        self.assertEquals(watchdog.describe(), 'NullWatchdog')
         self.assertIsInstance(NullWatchdog.from_config({}), NullWatchdog)
 
 
@@ -210,7 +210,7 @@ class TestLinuxWatchdogDevice(unittest.TestCase):
         self.assertRaises(WatchdogError, self.impl.get_timeout)
         self.assertRaises(WatchdogError, self.impl.set_timeout, 10)
         # We still try to output a reasonable string even if getting info errors
-        self.assertEqual(self.impl.describe(), "Linux watchdog device")
+        self.assertEquals(self.impl.describe(), "Linux watchdog device")
 
     @patch('os.open', Mock(side_effect=OSError))
     def test_open(self):