February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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What happens in the case of a tie? Even if the original cluster contained an odd number of nodes, when the Primary node goes offline, this is no longer true. In simple quorum systems, each node votes for itself. However, a Witness, by its definition, must vote for some other node. This means some replica in the cluster will have more than one vote, and thus win the election.
In case there are somehow multiple witnesses, and votes are split anyway, PostgreSQL quorum systems usually account for the Log Sequence Number (LSN) from the Primary node. Even if it's only a single transaction, one of the nodes with the most votes will have replicated more data than the other, and this will break the tie.
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