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0bace7af3d
ginbulkdelete performs pending list cleanup before it searches the entry
tree (and any posting trees) for dead TIDs. This is necessary to avoid
leaving behind dangling TID references that index vacuuming is required
to remove; nothing prevents recently inserted pending list tuples from
containing TIDs that VACUUM already considers dead.
However, ginbulkdelete neglected to perform pending list cleanup on
VACUUM's second or subsequent call. It was therefore possible for a
VACUUM that requires multiple rounds of index vacuuming to leave behind
dangling references.
To fix, teach ginbulkdelete to perform pending list cleanup during every
call. In passing, tweak some related comments in the pending list
cleanup path to make it clear why it's safe for VACUUM to not _fully_
empty an index's pending list.
This was arguably an oversight in commit e2c79e14, which fixed a similar
issue where pending list cleanup by VACUUM could end early, but missed
this closely related problem.
Author: Peter Geoghegan <pg@bowt.ie>
Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru>
Discussion: https://postgr.es/m/CAH2-Wzmsa-RPA2Ko8A5LaGOnmbpimJ--71xkiBqwgjk3Fq8YEg@mail.gmail.com
Backpatch-through: 14
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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.