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When preparing a transaction xactCompletionCount needs to be incremented, even though the transaction has not committed yet. Otherwise the snapshot used within the transaction otherwise can get reused outside of the prepared transaction. As GetSnapshotData() does not include the current xid when building a snapshot, reuse would not be correct. Somewhat surprisingly the regression tests only rarely show incorrect results without the fix. The reason for that is that often the snapshot's xmax will be >= the backend xid, yielding a snapshot that is correct, despite the bug. I'm working on a reliable test for the bug, but it seems worth seeing whether this fixes all the BF failures while I do. Author: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/E1k7tGP-0005V0-5k@gemulon.postgresql.org |
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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/.