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Mark PekalaandGitHub
f5ee67fa1c
The priority is configured with `failover_priority` tag. Possible values are from `0` till infinity, where `0` means that the node will never become the leader, which is the same as `nofailover` tag set to `true`. As a result, in the configuration file one should set only one of `failover_priority` or `nofailover` tags. The failover priority kicks in only when there are more than one node have the same receive/replay LSN and are ahead of other nodes in the cluster. In this case the node with higher value of `failover_priority` is preferred. If there is a node with higher values of receive/replay LSN, it will become the new leader even if it has lower value of `failover_priority` (except when priority is set to 0). Close https://github.com/zalando/patroni/issues/2759
24 lines
1.4 KiB
Gherkin
24 lines
1.4 KiB
Gherkin
Feature: priority replication
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We should check that we can give nodes priority during failover
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Scenario: check failover priority 0 prevents leaderships
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Given I configure and start postgres0 with a tag failover_priority 1
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And I configure and start postgres1 with a tag failover_priority 0
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Then replication works from postgres0 to postgres1 after 20 seconds
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When I shut down postgres0
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And I sleep for 5 seconds
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Then postgres1 role is the secondary after 10 seconds
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And there is one of ["following a different leader because I am not allowed to promote"] INFO in the postgres1 patroni log after 5 seconds
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Given I start postgres0
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Then postgres0 role is the primary after 10 seconds
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Scenario: check higher failover priority is respected
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Given I configure and start postgres2 with a tag failover_priority 1
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And I configure and start postgres3 with a tag failover_priority 2
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Then replication works from postgres0 to postgres2 after 20 seconds
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And replication works from postgres0 to postgres3 after 20 seconds
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When I shut down postgres0
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And I sleep for 5 seconds
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Then postgres3 role is the primary after 10 seconds
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And there is one of ["postgres3 has equally tolerable WAL position and priority 2, while this node has priority 1","Wal position of postgres3 is ahead of my wal position"] INFO in the postgres2 patroni log after 5 seconds
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