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Make it visible replication state on standbys (#2733)

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To do that we use `pg_stat_get_wal_receiver()` function, which is available since 9.6. For older versions the `patronictl list` output and REST API responses remain as before.

In case if there is no wal receiver process we check if `restore_command` is set and show the state as `in archive recovery`.

Example of `patronictl list` output:
```bash
$ patronictl list
+ Cluster: batman -------------+---------+---------------------+----+-----------+
| Member      | Host           | Role    | State               | TL | Lag in MB |
+-------------+----------------+---------+---------------------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running             | 12 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | in archive recovery | 12 |         0 |
+-------------+----------------+---------+---------------------+----+-----------+

$ patronictl list
+ Cluster: batman -------------+---------+-----------+----+-----------+
| Member      | Host           | Role    | State     | TL | Lag in MB |
+-------------+----------------+---------+-----------+----+-----------+
| postgresql0 | 127.0.0.1:5432 | Leader  | running   | 12 |           |
| postgresql1 | 127.0.0.1:5433 | Replica | streaming | 12 |         0 |
+-------------+----------------+---------+-----------+----+-----------+
```

Example of REST API response:
```bash
$ curl -s localhost:8009 | jq .
{
  "state": "running",
  "postmaster_start_time": "2023-07-06 13:12:00.595118+02:00",
  "role": "replica",
  "server_version": 150003,
  "xlog": {
    "received_location": 335544480,
    "replayed_location": 335544480,
    "replayed_timestamp": null,
    "paused": false
  },
  "timeline": 12,
  "replication_state": "in archive recovery",
  "dcs_last_seen": 1688642069,
  "database_system_identifier": "7252327498286490579",
  "patroni": {
    "version": "3.0.3",
    "scope": "batman"
  }
}

$ curl -s localhost:8009 | jq .
{
  "state": "running",
  "postmaster_start_time": "2023-07-06 13:12:00.595118+02:00",
  "role": "replica",
  "server_version": 150003,
  "xlog": {
    "received_location": 335544816,
    "replayed_location": 335544816,
    "replayed_timestamp": null,
    "paused": false
  },
  "timeline": 12,
  "replication_state": "streaming",
  "dcs_last_seen": 1688642089,
  "database_system_identifier": "7252327498286490579",
  "patroni": {
    "version": "3.0.3",
    "scope": "batman"
  }
}
```
This commit is contained in:
Alexander Kukushkin
2023-07-13 09:24:20 +02:00
committed by GitHub
parent 665f49b320
commit d46ca88e6b
13 changed files with 115 additions and 26 deletions
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features/standby_cluster.feature
+10
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@@ -13,6 +13,10 @@ Feature: standby cluster
When I start postgres0
Then "members/postgres0" key in DCS has state=running after 10 seconds
And replication works from postgres1 to postgres0 after 15 seconds
When I issue a GET request to http://127.0.0.1:8008/patroni
Then I receive a response code 200
And I receive a response replication_state streaming
And "members/postgres0" key in DCS has replication_state=streaming after 10 seconds
@slot-advance
Scenario: check permanent logical slots are synced to the replica
@@ -34,6 +38,9 @@ Feature: standby cluster
Then postgres1 is a leader of batman1 after 10 seconds
When I add the table foo to postgres0
Then table foo is present on postgres1 after 20 seconds
When I issue a GET request to http://127.0.0.1:8009/patroni
Then I receive a response code 200
And I receive a response replication_state streaming
And I sleep for 3 seconds
When I issue a GET request to http://127.0.0.1:8009/primary
Then I receive a response code 503
@@ -44,6 +51,9 @@ Feature: standby cluster
When I start postgres2 in a cluster batman1
Then postgres2 role is the replica after 24 seconds
And table foo is present on postgres2 after 20 seconds
When I issue a GET request to http://127.0.0.1:8010/patroni
Then I receive a response code 200
And I receive a response replication_state streaming
And postgres1 does not have a logical replication slot named test_logical
Scenario: check failover