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At the end of recovery for the post-promotion process, a new history file is created followed by the last partial segment of the previous timeline. Based on the timing, the archiver would first try to archive the last partial segment and then the history file. This can delay the detection of a new timeline taken, particularly depending on the time it takes to transfer the last partial segment as it delays the moment the history file of the new timeline gets archived. This can cause promoted standbys to use the same timeline as one already taken depending on the circumstances if multiple instances look at archives at the same location. This commit changes the order of archiving so as history files are archived in priority over other file types, which reduces the likelihood of the same timeline being taken (still not reducing the window to zero), and it makes the archiver behave more consistently with the startup process doing its post-promotion business. Author: David Steele Reviewed-by: Michael Paquier, Kyotaro Horiguchi Discussion: https://postgr.es/m/929068cf-69e1-bba2-9dc0-e05986aed471@pgmasters.net Backpatch-through: 9.5 |
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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/.