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eda4ef8151
pg_stat_get_snapshot_timestamp() returns the timestamp seen in the "global" stats file. Because pgstat_write_statsfiles() writes per-DB stats files before the global file (or at least before renaming it into place), there is a window where the test backend can see all the stats updates that wait_for_stats() was checking for (all of which come from the per-DB file) but also see the same global stats file it had seen at the start of the test script. This results in a failure in only the "snapshot_newer" query, as reported by a couple of buildfarm members recently. I suspect that this ought to be back-patched. Commit 4e37b3e15 has evidently increased the probability of this window getting hit, but it's not apparent why it could not have been hit before. I'll refrain for the moment though.
PostgreSQL tests ================ This directory contains a variety of test infrastructure as well as some of the tests in PostgreSQL. Not all tests are here -- in particular, there are more in individual contrib/ modules and in src/bin. Not all these tests get run by "make check". Check src/test/Makefile to see which tests get run automatically. authentication/ Tests for authentication examples/ Demonstration programs for libpq that double as regression tests via "make check" isolation/ Tests for concurrent behavior at the SQL level locale/ Sanity checks for locale data, encodings, etc mb/ Tests for multibyte encoding (UTF-8) support modules/ Extensions used only or mainly for test purposes, generally not suitable for installing in production databases perl/ Infrastructure for Perl-based TAP tests recovery/ Test suite for recovery and replication regress/ PostgreSQL's main regression test suite, pg_regress ssl/ Tests to exercise and verify SSL certificate handling subscription/ Tests for logical replication thread/ A thread-safety-testing utility used by configure