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Amit Kapila e385a4e2fd Prevent unintended dropping of active replication origins. ... Commit 5b148706c5 exposed functionality that allows multiple processes to use the same replication origin, enabling non-builtin logical replication solutions to implement parallel apply for large transactions. With this functionality, if two backends acquire the same replication origin and one of them resets it first, the acquired_by flag is cleared without acknowledging that another backend is still actively using the origin. This can lead to the origin being unintentionally dropped. If the shared memory for that dropped origin is later reused for a newly created origin, the remaining backend that still holds a pointer to the old memory may inadvertently advance the LSN of a completely different origin, causing unpredictable behavior. Although the underlying issue predates commit 5b148706c5, it did not surface earlier because the internal parallel apply worker mechanism correctly coordinated origin resets and drops. This commit resolves the problem by introducing a reference counter for replication origins. The reference count increases when a backend sets the origin and decreases when it resets it. Additionally, the backend that first acquires the origin will not release it until all other backends using the origin have released it as well. The patch also prevents dropping a replication origin when acquired_by is zero but the reference counter is nonzero, covering the scenario where the first session exits without properly releasing the origin. Author: Hou Zhijie <houzj.fnst@fujitsu.com> Author: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Shveta Malik <shveta.malik@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Discussion: https://postgr.es/m/TY4PR01MB169077EE72ABE9E55BAF162D494B5A@TY4PR01MB16907.jpnprd01.prod.outlook.com Discussion: https://postgr.es/m/CAMPB6wfe4zLjJL8jiZV5kjjpwBM2=rTRme0UCL7Ra4L8MTVdOg@mail.gmail.com		2 weeks ago
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expected	Prevent unintended dropping of active replication origins.	2 weeks ago
specs	Prevent unintended dropping of active replication origins.	2 weeks ago
sql	Add mem_exceeded_count column to pg_stat_replication_slots.	4 months ago
t	Update copyright for 2026	3 weeks ago
.gitignore	Improve isolation tests infrastructure.	9 years ago
Makefile	Add optional pid parameter to pg_replication_origin_session_setup().	4 months ago
logical.conf	Stabilize streaming tests in test_decoding.	4 years ago
meson.build	Update copyright for 2026	3 weeks ago
test_decoding.c	Update copyright for 2026	3 weeks ago