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To insert the merged GIN entries in _gin_parallel_merge, the leader calls ginEntryInsert(). This may allocate memory, e.g. for a new leaf tuple. This was allocated in the PortalContext, and kept until the end of the index build. For most GIN indexes the amount of leaked memory is negligible, but for custom opclasses with large keys it may cause OOMs. Fixed by calling ginEntryInsert() in a temporary memory context, reset after each insert. Other ginEntryInsert() callers do this too, except that the context is reset after batches of inserts. More frequent resets don't seem to hurt performance, it may even help it a bit. Report and fix by Vinod Sridharan. Author: Vinod Sridharan <vsridh90@gmail.com> Reviewed-by: Tomas Vondra <tomas@vondra.me> Discussion: https://postgr.es/m/CAFMdLD4p0VBd8JG=Nbi=BKv6rzFAiGJ_sXSFrw-2tNmNZFO5Kg@mail.gmail.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/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/.