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If walsender doesn't hear from the client for the time specified by wal_sender_timeout, it will conclude the connection or client is dead, and disconnect. When half of wal_sender_timeout has elapsed, it sends a ping to the client, leaving it the remainig half of wal_sender_timeout to respond. However, it only checked if half of wal_sender_timeout had elapsed when it was about to sleep, so if it was busy sending WAL to the client for long enough, it would not send the ping request in time. Then the client would not know it needs to send a reply, and the walsender will disconnect even though the client is still alive. Fix that. Andres Freund, reviewed by Robert Haas, and some further changes by me. Backpatch to 9.3. Earlier versions relied on the client to send the keepalives on its own, and hence didn't have this problem.
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/.