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Commit 28724fd90d2f85a0573a8107b48abad062a86d83 fixed things so that if a background worker fails to start due to fork() failure or because it is terminated before startup succeeds, BGWH_STOPPED will be reported. However, that only helps if the code that uses the background worker machinery notices the change in status, and the code in parallel.c did not. To fix that, do two things. First, make sure that when a worker exits, it triggers the leader to read from error queues. That way, if a worker which has attached to an error queue exits uncleanly, the leader is sure to throw some error, either the contents of the ErrorResponse sent by the worker, or "lost connection to parallel worker" if it exited without sending one. To cover the case where the worker never starts up in the first place or exits before attaching to the error queue, the ParallelContext now keeps track of which workers have sent at least one message via the error queue. A worker which sends no messages by the time the parallel operation finishes will be checked to see whether it exited before attaching to the error queue; if so, a new error message, "parallel worker failed to initialize", will be reported. If not, we'll continue to wait until it either starts up and exits cleanly, starts up and exits uncleanly, or fails to start, and then take the appropriate action. Patch by me, reviewed by Amit Kapila. Discussion: http://postgr.es/m/CA+TgmoYnBgXgdTu6wk5YPdWhmgabYc9nY_pFLq=tB=FSLYkD8Q@mail.gmail.com
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/.