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7b28913bca
I (Andres) broke this in 623a9CA79bx, because I didn't think about the way snapshots are built on standbys sufficiently. Unfortunately our existing tests did not catch this, as they are all just querying with psql (therefore ending up with fresh snapshots). The fix is trivial, we just need to increment the transaction completion counter in ExpireTreeKnownAssignedTransactionIds(), which is the equivalent of ProcArrayEndTransaction() during recovery. This commit also adds a new test doing some basic testing of the correctness of snapshots built on standbys. To avoid the aforementioned issue of one-shot psql's not exercising the snapshot caching, the test uses a long lived psqls, similar to 013_crash_restart.pl. It'd be good to extend the test further. Reported-By: Ian Barwick <ian.barwick@2ndquadrant.com> Author: Andres Freund <andres@anarazel.de> Author: Ian Barwick <ian.barwick@2ndquadrant.com> Discussion: https://postgr.es/m/61291ffe-d611-f889-68b5-c298da9fb18f@2ndquadrant.com |
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