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Since reducing pg_ctl's reaction time in commit c61559ec3, some
slower buildfarm members have shown erratic failures in this test.
The reason turns out to be that the test assumes synchronous
replication (because it does not provide any lag time for a commit
to replicate before shutting down the servers), but it had only
enabled sync rep in one direction. The observed symptoms correspond
to failure to replicate the last committed transaction in the other
direction, which can be expected to happen if the shutdown command
is issued soon enough and we are providing no synchronous-commit
guarantees.
Fix that, and add a bit more paranoid state checking at the bottom
of the script.
Michael Paquier and myself
Discussion: https://postgr.es/m/908.1498965681@sss.pgh.pa.us
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/.