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Multi Sync Standby Support (#1594)

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The new parameter `synchronous_node_count` is used by Patroni to manage number of synchronous standby databases. It is set to 1 by default. It has no effect when synchronous_mode is set to off. When enabled, Patroni manages precise number of synchronous standby databases based on parameter synchronous_node_count and adjusts the state in DCS & synchronous_standby_names as members join and leave.

This functionality can be further extended to support Priority (FIRST n) based synchronous replication & Quorum (ANY n) based synchronous replication in future.
This commit is contained in:
ksarabu1
2020-08-14 11:51:07 +02:00
committed by GitHub
parent fce1955218
commit 1ab709c5f0
14 changed files with 163 additions and 95 deletions
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features/basic_replication.feature
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@@ -28,6 +28,27 @@ Feature: basic replication
When I issue a GET request to http://127.0.0.1:8009/async
Then I receive a response code 200
Scenario: check multi sync replication
Given I issue a PATCH request to http://127.0.0.1:8008/config with {"synchronous_node_count": 2}
Then I receive a response code 200
And I sleep for 10 seconds
Then "sync" key in DCS has sync_standby=postgres1,postgres2 after 5 seconds
When I issue a GET request to http://127.0.0.1:8010/sync
Then I receive a response code 200
When I issue a GET request to http://127.0.0.1:8009/sync
Then I receive a response code 200
When I issue a PATCH request to http://127.0.0.1:8008/config with {"synchronous_node_count": 1}
Then I receive a response code 200
And I shut down postgres1
And I sleep for 10 seconds
Then "sync" key in DCS has sync_standby=postgres2 after 10 seconds
When I start postgres1
And "members/postgres1" key in DCS has state=running after 10 seconds
When I issue a GET request to http://127.0.0.1:8010/sync
Then I receive a response code 200
When I issue a GET request to http://127.0.0.1:8009/async
Then I receive a response code 200
Scenario: check the basic failover in synchronous mode
Given I run patronictl.py pause batman
Then I receive a response returncode 0