cff1bd2a3c
Since 9.3, when the --jobs option was introduced, using it together with the --serializable-deferrable option generated multiple errors. We can get correct behavior by allowing the connection which acquires the snapshot to use SERIALIZABLE, READ ONLY, DEFERRABLE and pass that to the workers running the other connections using REPEATABLE READ, READ ONLY. This is a bit of a kluge since the SERIALIZABLE behavior is achieved by running some of the participating connections at a different isolation level, but it is a simple and safe change, suitable for back-patching. This will be followed by a proposal for a more invasive fix with some slight behavioral changes on just the master branch, based on suggestions from Andres Freund, but the kluge will be applied to master until something is agreed along those lines. Back-patched to 9.3, where the --jobs option was added. Based on report from Alexander Korotkov
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/.