mirror of
https://github.com/postgres/postgres.git
synced 2025-05-31 00:01:57 -04:00
c4f99d2029
Previously pg_receivexlog flushed WAL data only when WAL file was switched. Then 3dad73e added -F option to pg_receivexlog so that users could control how frequently sync commands were issued to WAL files. It also allowed users to make pg_receivexlog flush WAL data immediately after writing by specifying 0 in -F option. However feedback messages were not sent back immediately even after a flush location was updated. So even if WAL data was flushed in real time, the server could not see that for a while. This commit removes -F option from and adds --synchronous to pg_receivexlog. If --synchronous is specified, like the standby's wal receiver, pg_receivexlog flushes WAL data as soon as there is WAL data which has not been flushed yet. Then it sends back the feedback message identifying the latest flush location to the server. This option is useful to make pg_receivexlog behave as sync standby by using replication slot, for example. Original patch by Furuya Osamu, heavily rewritten by me. Reviewed by Heikki Linnakangas, Alvaro Herrera and Sawada Masahiko.
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.