400a790a48
Previously, when the startup process applied WAL and requested walreceiver to send an apply notification to the primary, walreceiver sent a status reply unconditionally, even if the WAL locations had not advanced since the previous update. As a result, the standby could send two consecutive status reply messages with identical WAL locations even though wal_receiver_status_interval had not yet elapsed. This could unexpectedly reset the reported replication lag, making it difficult for users to monitor lag. The second message was also unnecessary because it reported no progress. This commit updates walreceiver to send a reply only when the apply location has advanced since the last status update, even when the startup process requests a notification. Author: Fujii Masao <masao.fujii@gmail.com> Reviewed-by: Shinya Kato <shinya11.kato@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Discussion: https://postgr.es/m/CAOzEurTzcUrEzrH97DD7+Yz=HGPU81kzWQonKZvqBwYhx2G9_A@mail.gmail.com
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.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.