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If a continuation record is split so that its first half has already been removed from the master, and is only present in pg_wal, and there is a recycled WAL segment in the standby server that looks like it would contain the second half, recovery would get stuck. The code in XLogPageRead() incorrectly started streaming at the beginning of the WAL record, even if we had already read the first page. Backpatch to 9.4. In principle, older versions have the same problem, but without replication slots, there was no straightforward mechanism to prevent the master from recycling old WAL that was still needed by standby. Without such a mechanism, I think it's reasonable to assume that there's enough slack in how many old segments are kept around to not run into this, or you have a WAL archive. Reported by Jonathon Nelson. Analysis and patch by Kyotaro HORIGUCHI, with some extra comments by me. Discussion: https://www.postgresql.org/message-id/CACJqAM3xVz0JY1XFDKPP%2BJoJAjoGx%3DGNuOAshEDWCext7BFvCQ%40mail.gmail.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/.