f30848cb05
When the standby is passed as a PostgreSQL::Test::Cluster instance, use the WAIT FOR LSN command on the standby server to implement wait_for_catchup() for replay, write, and flush modes. This is more efficient than polling pg_stat_replication on the upstream, as the WAIT FOR LSN command uses a latch-based wakeup mechanism. The optimization applies when: - The standby is passed as a Cluster object (not just a name string) - The mode is 'replay', 'write', or 'flush' (not 'sent') - The standby is in recovery For 'sent' mode, when the standby is passed as a string (e.g., a subscription name for logical replication), or when the standby has been promoted, the function falls back to the original polling-based approach using pg_stat_replication on the upstream. Discussion: https://postgr.es/m/CABPTF7UiArgW-sXj9CNwRzUhYOQrevLzkYcgBydmX5oDes1sjg%40mail.gmail.com Author: Xuneng Zhou <xunengzhou@gmail.com> Reviewed-by: Alexander Korotkov <aekorotkov@gmail.com> Reviewed-by: Chao Li <li.evan.chao@gmail.com> Reviewed-by: Alvaro Herrera <alvherre@kurilemu.de>
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/.