February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Do not confuse a major PostgreSQL upgrade with a minor one. While we can use the steps in this recipe to upgrade from 12.0 to 12.1, for example, we cannot use it to move from 11.4 to 12.0 or 12.1.
This is because an upgrade of that magnitude currently requires pg_upgrade, pg_dump, or some clever application of logical replication. In any of these cases, the newly upgraded PostgreSQL instance is actually a copy of the old database, rather than a binary compatible update.
Patroni relies on the PostgreSQL physical replication system to synchronize nodes. Since it's not possible to replicate between major PostgreSQL versions, Patroni can't integrate nodes with large version mismatches.
If we tried a similar tactic as outlined ...
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