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When pg_receivexlog --slot is connecting to the server, at the shutdown of the server, walsender keeps waiting for the last WAL record to be replicated and flushed in pg_receivexlog. But previously pg_receivexlog issued sync command only when WAL file was switched. So there was the case where the last WAL was never flushed and walsender had to keep waiting infinitely. This caused the server shutdown to get stuck. pg_recvlogical handles this problem by calling fsync() when it receives the request of immediate reply from the server. That is, at shutdown, walsender sends the request, pg_recvlogical receives it, flushes the last WAL record, and sends the flush location back to the server. Since walsender can see that the last WAL record is successfully flushed, it can exit cleanly. This commit introduces the same logic as pg_recvlogical has, to pg_receivexlog. Back-patch to 9.4 where pg_receivexlog was changed so that it can use the replication slot. Original patch by Michael Paquier, rewritten by me. Bug report by Furuya Osamu.
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/.