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pgsql: doc: Say which LSN gives read-your-writes with WAIT 2+ messages / 1 participants [nested] [flat]
* pgsql: doc: Say which LSN gives read-your-writes with WAIT @ 2026-09-17 06:36 Alexander Korotkov <akorotkov@postgresql.org> 0 siblings, 0 replies; 2+ messages in thread From: Alexander Korotkov @ 2026-09-17 06:36 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org doc: Say which LSN gives read-your-writes with WAIT The reference page and the read-your-writes section both presented WAIT in standby_replay mode as enough for read-your-writes, without saying which LSN to wait for. Read as written, an LSN taken after the last statement but before COMMIT would do, and it would not: the standby position WAIT compares against is the end of the last replayed record, so a target that falls inside the COMMIT record is satisfied while that record is still unapplied. Say that the target must be at or after the end of the write transaction's COMMIT record, and note in the example that autocommit is what puts the UPDATE's commit before the call that reads the position. Author: Sami Imseih <samimseih.pg@gmail.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Discussion: https://postgr.es/m/CAN12%2BYKN7gXb1o9bDWgfA%3D6wjDrqNEgt%2BrXJiAWXgPCXQ5TqpA%40mail.gmail.com Backpatch-through: 19 Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/2af020eacb8b74232a0570f72a05dd1f274f68de Modified Files -------------- doc/src/sgml/high-availability.sgml | 11 ++++++----- doc/src/sgml/ref/wait.sgml | 19 +++++++++++++------ 2 files changed, 19 insertions(+), 11 deletions(-) ^ permalink raw reply [nested|flat] 2+ messages in thread
* pgsql: doc: Say which LSN gives read-your-writes with WAIT @ 2026-09-17 06:37 Alexander Korotkov <akorotkov@postgresql.org> 0 siblings, 0 replies; 2+ messages in thread From: Alexander Korotkov @ 2026-09-17 06:37 UTC (permalink / raw) To: pgsql-committers@lists.postgresql.org doc: Say which LSN gives read-your-writes with WAIT The reference page and the read-your-writes section both presented WAIT in standby_replay mode as enough for read-your-writes, without saying which LSN to wait for. Read as written, an LSN taken after the last statement but before COMMIT would do, and it would not: the standby position WAIT compares against is the end of the last replayed record, so a target that falls inside the COMMIT record is satisfied while that record is still unapplied. Say that the target must be at or after the end of the write transaction's COMMIT record, and note in the example that autocommit is what puts the UPDATE's commit before the call that reads the position. Author: Sami Imseih <samimseih.pg@gmail.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Discussion: https://postgr.es/m/CAN12%2BYKN7gXb1o9bDWgfA%3D6wjDrqNEgt%2BrXJiAWXgPCXQ5TqpA%40mail.gmail.com Backpatch-through: 19 Branch ------ REL_19_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/a203d20190059ee8a8dd830ecfb7834c704cb53c Modified Files -------------- doc/src/sgml/high-availability.sgml | 11 ++++++----- doc/src/sgml/ref/wait.sgml | 19 +++++++++++++------ 2 files changed, 19 insertions(+), 11 deletions(-) ^ permalink raw reply [nested|flat] 2+ messages in thread
end of thread, other threads:[~2026-09-17 06:37 UTC | newest] Thread overview: 2+ messages (download: mbox mbox.gz follow: Atom feed) -- links below jump to the message on this page -- 2026-09-17 06:36 pgsql: doc: Say which LSN gives read-your-writes with WAIT Alexander Korotkov <akorotkov@postgresql.org> 2026-09-17 06:37 pgsql: doc: Say which LSN gives read-your-writes with WAIT Alexander Korotkov <akorotkov@postgresql.org>
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