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Previously, when the replay LSN reported in feedback messages from a standby stopped advancing, for example, due to a recovery conflict, the write_lag and flush_lag columns in pg_stat_replication would initially update but then stop progressing. This prevented users from correctly monitoring replication lag. The problem occurred because when any LSN stopped updating, the lag tracker's cyclic buffer became full (the write head reached the slowest read head). In that state, the lag tracker could no longer compute round-trip lag values correctly. This commit fixes the issue by handling the slowest read entry (the one causing the buffer to fill) as a separate overflow entry and freeing space so the write and other read heads can continue advancing in the buffer. As a result, write_lag and flush_lag now continue updating even if the reported replay LSN remains stalled. Backpatch to all supported versions. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Chao Li <lic@highgo.com> Reviewed-by: Shinya Kato <shinya11.kato@gmail.com> Reviewed-by: Xuneng Zhou <xunengzhou@gmail.com> Discussion: https://postgr.es/m/CAHGQGwGdGQ=1-X-71Caee-LREBUXSzyohkoQJd4yZZCMt24C0g@mail.gmail.com Backpatch-through: 13 |
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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/.