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Commit3b4e53a

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Add infrastructure for efficient LSN waiting
Implement a new facility that allows processes to wait for WAL to reachspecific LSNs, both on primary (waiting for flush) and standby (waitingfor replay) servers.The implementation uses shared memory with per-backend informationorganized into pairing heaps, allowing O(1) access to the minimumwaited LSN. This enables fast-path checks: after replaying or flushingWAL, the startup process or WAL writer can quickly determine if anywaiters need to be awakened.Key components:- New xlogwait.c/h module with WaitForLSNReplay() and WaitForLSNFlush()- Separate pairing heaps for replay and flush waiters- WaitLSN lightweight lock for coordinating shared state- Wait events WAIT_FOR_WAL_REPLAY and WAIT_FOR_WAL_FLUSH for monitoringThis infrastructure can be used by features that need to wait for WALoperations to complete.Discussion:https://www.postgresql.org/message-id/flat/CAPpHfdsjtZLVzxjGT8rJHCYbM0D5dwkO+BBjcirozJ6nYbOW8Q@mail.gmail.comDiscussion:https://www.postgresql.org/message-id/flat/CABPTF7UNft368x-RgOXkfj475OwEbp%2BVVO-wEXz7StgjD_%3D6sw%40mail.gmail.comAuthor: Kartyshov Ivan <i.kartyshov@postgrespro.ru>Author: Alexander Korotkov <aekorotkov@gmail.com>Author: Xuneng Zhou <xunengzhou@gmail.com>Reviewed-by: Michael Paquier <michael@paquier.xyz>Reviewed-by: Peter Eisentraut <peter.eisentraut@enterprisedb.com>Reviewed-by: Dilip Kumar <dilipbalaut@gmail.com>Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>Reviewed-by: Alexander Lakhin <exclusion@gmail.com>Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>Reviewed-by: Euler Taveira <euler@eulerto.com>Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>Reviewed-by: Kyotaro Horiguchi <horikyota.ntt@gmail.com>Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com>
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‎src/backend/access/transam/Makefile‎

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@@ -36,7 +36,8 @@ OBJS = \
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xlogreader.o\
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xlogrecovery.o\
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xlogstats.o\
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xlogutils.o
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xlogutils.o\
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xlogwait.o
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include$(top_srcdir)/src/backend/common.mk
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‎src/backend/access/transam/meson.build‎

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@@ -24,6 +24,7 @@ backend_sources += files(
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'xlogrecovery.c',
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'xlogstats.c',
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'xlogutils.c',
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'xlogwait.c',
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)
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# used by frontend programs to build a frontend xlogreader

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