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Fix callbacks behavior (mostly for standby cluster) (#998)

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First of all, this patch changes the behavior of `on_start`/`on_restart` callbacks, they will be called only when postgres is started or restarted without role changes. In case if the member is promoted or demoted only the `on_role_change` callback will be executed. `on_role_change` was never called for standby leader, only `on_start`/`on_restart` and with a wrong role argument.
Before that `on_role_change` was never called for standby leader, only `on_start`/`on_restart` and with a wrong role argument.

In addition to that, the REST API will return standby_leader role for the leader of the standby cluster.

Closes https://github.com/zalando/patroni/issues/988
This commit is contained in:
Alexander Kukushkin
2019-03-29 10:28:07 +01:00
committed by GitHub
parent e059e30560
commit e38fe78b56
11 changed files with 109 additions and 58 deletions
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docs/SETTINGS.rst
+4 -4
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@@ -139,10 +139,10 @@ PostgreSQL
- **password**: replication password; the user will be created during initialization.
- **callbacks**: callback scripts to run on certain actions. Patroni will pass the action, role and cluster name. (See scripts/aws.py as an example of how to write them.)
- **on\_reload**: run this script when configuration reload is triggered.
- **on\_restart**: run this script when the cluster restarts.
- **on\_role\_change**: run this script when the cluster is being promoted or demoted.
- **on\_start**: run this script when the cluster starts.
- **on\_stop**: run this script when the cluster stops.
- **on\_restart**: run this script when the postgres restarts (without changing role).
- **on\_role\_change**: run this script when the postgres is being promoted or demoted.
- **on\_start**: run this script when the postgres starts.
- **on\_stop**: run this script when the postgres stops.
- **connect\_address**: IP address + port through which Postgres is accessible from other nodes and applications.
- **create\_replica\_methods**: an ordered list of the create methods for turning a Patroni node into a new replica.
"basebackup" is the default method; other methods are assumed to refer to scripts, each of which is configured as its