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7b28913bca
I (Andres) broke this in 623a9CA79bx, because I didn't think about the way snapshots are built on standbys sufficiently. Unfortunately our existing tests did not catch this, as they are all just querying with psql (therefore ending up with fresh snapshots). The fix is trivial, we just need to increment the transaction completion counter in ExpireTreeKnownAssignedTransactionIds(), which is the equivalent of ProcArrayEndTransaction() during recovery. This commit also adds a new test doing some basic testing of the correctness of snapshots built on standbys. To avoid the aforementioned issue of one-shot psql's not exercising the snapshot caching, the test uses a long lived psqls, similar to 013_crash_restart.pl. It'd be good to extend the test further. Reported-By: Ian Barwick <ian.barwick@2ndquadrant.com> Author: Andres Freund <andres@anarazel.de> Author: Ian Barwick <ian.barwick@2ndquadrant.com> Discussion: https://postgr.es/m/61291ffe-d611-f889-68b5-c298da9fb18f@2ndquadrant.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. 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/.