8ff518699f
Commit b460f5d6693103076dc554aa7cbb96e1e53074f9 failed to contemplate the possibilit that a parallel worker registered before a crash would be unregistered only after the crash; if that happened, we'd end up with parallel_terminate_count > parallel_register_count and the system would refuse to launch any more parallel workers. The easiest way to fix that seems to be to forget BGW_NEVER_RESTART workers in ResetBackgroundWorkerCrashTimes() rather than leaving them around to be cleaned up after the conclusion of the restart, so that they go away before rather than after shared memory is reset. To make sure that this fix is water-tight, don't allow parallel workers to be anything other than BGW_NEVER_RESTART, so that after recovering from a crash, 0 is guaranteed to be the correct starting value for parallel_register_count. The core code wouldn't do this anyway, but somebody might try to do it in extension code. Report by Thomas Vondra. Patch by me, reviewed by Kuntal Ghosh. Discussion: http://postgr.es/m/CAGz5QC+AVEVS+3rBKRq83AxkJLMZ1peMt4nnrQwczxOrmo3CNw@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: 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/.