In addition to that rename confusing `Etcd.client` and
`ZooKeeper.client` into `_client`. This attribute is available from
AbstractDCS and people had wrong impression that it provides the same
interface for different DCS implementations, which is obviously not the
case. For Etcd it has type etcd.Client and for ZooKeeper - KazooClient.
Despite this release was very buggy it has really nice features:
* EtcdWatchTimedOut exception is raised when `watch` call timed out
* it supports SRV autodiscovery
Since we already implemented our own SRV discovery this feature is not
really interesting for us, but it solves the problem of having two
requirements files for different python versions, because python-etcd
will install dnspython or dnspython3 as a dependency.
In order to fix https://github.com/jplana/python-etcd/issues/152 and
https://github.com/jplana/python-etcd/pull/154 I had to override
`api_execute` method.
Previously, "without_leader" suffix was used in the name of methods
and functions that initialize a replica without an active replication
connection, and leader was part of the name for parameters and messages
that require an active replication conneciton. Since we support init
from the members other than the leader, those conventions have to be
changed.
At the moment we just replace the master with the
node at the 'clonefrom' tag if it's present. Master
should be available anyway, otherwise, it will not
even try to do cloning.
Acceptance tests:
https://github.com/zalando/patroni/pull/144/commits
The actual amount of time to establish the master and the replication
after the scheduled failover seems sufficient (15 seconds with the
failover in 10 seconds), but occasionally leads to test failures.
This is unlikely the test issue and should be investigated inside
the patroni.
Add an ability to specify the origin and the destination for
the replication works clause. Use this ability in the API
promotion test to ensure the replication from the former
replica to the former master.
Toggle the etcd debug logging and write the log to the test dir.
Make sure etcd and patroni are terminated when the tests finish
by sending SIGKILL in case SIGTERM does not work.
Make sure before.all code does the proper cleanup when the exception
is thrown.
Alexander Kukushkin