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'ALTER SUBSCRIPTION ... REFRESH SEQUENCES' can race with an already running sequence synchronization worker. If a second refresh request resets the synchronization state while the worker has already fetched sequence values from the publisher but has not yet applied them to the subscriber, the worker can overwrite the subscriber with stale values and mark the synchronization as complete. Avoid this race by rejecting 'ALTER SUBSCRIPTION ... REFRESH SEQUENCES' when a sequence synchronization worker is already running for the subscription. The command reports an error asking the user to rerun it after the current synchronization completes. Also add a wait for the re-added 'regress_s4' sequence to finish synchronizing in 036_sequences.pl, so the subsequent test does not race against its sequencesync worker. Reported-by: Noah Misch <noah@leadboat.com> Author: vignesh C <vignesh21@gmail.com> Reviewed-by: Shveta Malik <shveta.malik@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 19, where it was introduced Discussion: https://postgr.es/m/20260710045217.f0.noahmisch@microsoft.com
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.