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fix: fix flaky CopyBothResponseTest by using WAL flush LSN - #3979
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vlsi merged 1 commit intoMar 20, 2026
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Use pg_current_wal_flush_lsn() instead of pg_current_wal_lsn() in CopyBothResponseTest.getCurrentLSN(). The test uses physical replication (START_REPLICATION without a slot), which requires the starting point to be at or before the WAL flush position. pg_current_wal_lsn() returns the write position, which can be ahead of the flush position under concurrent WAL activity, causing the error: "requested starting point is ahead of the WAL flush position of this server" Also relax the keep-alive LSN assertion in keedAliveContainsCorrectLSN() to use greaterThanOrEqualTo instead of equalTo, since the keep-alive reports end-of-WAL (write position) which can be ahead of the flush LSN. Similar to 2a7ac41 which fixed flaky replication restart tests in LogicalReplicationTest by waiting for confirmed_flush_lsn. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Similar to 2a7ac41 which fixed flaky replication restart tests in LogicalReplicationTest by waiting for confirmed_flush_lsn.
It should fix failure like
https://github.com/pgjdbc/pgjdbc/actions/runs/23354694589/job/67942890085?pr=3844