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Previously, autovacuum always disabled parallel vacuum regardless of the table's index count or configuration. This commit enables autovacuum workers to use parallel index vacuuming and index cleanup, using the same parallel vacuum infrastructure as manual VACUUM. Two new configuration options control the feature. The GUC autovacuum_max_parallel_workers sets the maximum number of parallel workers a single autovacuum worker may launch; it defaults to 0, preserving existing behavior unless explicitly enabled. The per-table storage parameter autovacuum_parallel_workers provides per-table limits. A value of 0 disables parallel vacuum for the table, a positive value caps the worker count (still bounded by the GUC), and -1 (the default) defers to the GUC. To handle cases where autovacuum workers receive a SIGHUP and update their cost-based vacuum delay parameters mid-operation, a new propagation mechanism is added to vacuumparallel.c. The leader stores its effective cost parameters in a DSM segment. Parallel vacuum workers poll for changes in vacuum_delay_point(); if an update is detected, they apply the new values locally via VacuumUpdateCosts(). A new test module, src/test/modules/test_autovacuum, is added to verify that parallel autovacuum workers are correctly launched and that cost-parameter updates are propagated as expected. The patch was originally proposed by Maxim Orlov, but the implementation has undergone significant architectural changes since then during the review process. Author: Daniil Davydov <3danissimo@gmail.com> Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com> Reviewed-by: Sami Imseih <samimseih@gmail.com> Reviewed-by: Matheus Alcantara <matheusssilv97@gmail.com> Reviewed-by: Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Reviewed-by: zengman <zengman@halodbtech.com> Discussion: https://postgr.es/m/CACG=ezZOrNsuLoETLD1gAswZMuH2nGGq7Ogcc0QOE5hhWaw=cw@mail.gmail.com |
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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/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/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/.