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Previously, when running pgbench in pipeline mode with a custom script
that triggered retriable errors (e.g., serialization errors),
an assertion failure could occur:
Assertion failed: (res == ((void*)0)), function discardUntilSync, file pgbench.c, line 3515.
The root cause was that pgbench incorrectly assumed only a single
pipeline sync message would be received at the end. In reality,
multiple pipeline sync messages can be sent and must be handled properly.
This commit fixes the issue by updating pgbench to correctly process
multiple pipeline sync messages, preventing the assertion failure.
Back-patch to v15, where the bug was introduced.
Author: Fujii Masao <masao.fujii@gmail.com>
Reviewed-by: Tatsuo Ishii <ishii@postgresql.org>
Discussion: https://postgr.es/m/CAHGQGwFAX56Tfx+1ppo431OSWiLLuW72HaGzZ39NkLkop6bMzQ@mail.gmail.com
Backpatch-through: 15
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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. 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/.