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Previously, database clusters created by a TAP test were shut down by DESTROY methods attached to the PostgresNode objects representing them. The trouble with that is that if the objects survive into the final global destruction phase (which they do), Perl executes the DESTROY methods in an unspecified order. Thus, the order of shutdown of multiple clusters was indeterminate, which might lead to not-very-reproducible errors getting logged (eg from a slave whose master might or might not get killed first). Worse, the File::Temp objects representing the temporary PGDATA directories might get destroyed before the PostgresNode objects, resulting in attempts to delete PGDATA directories that still have live servers in them. On Windows, this would lead to directory deletion failures; on Unix, it usually had no effects worse than erratic "could not open temporary statistics file "pg_stat/global.tmp": No such file or directory" log messages. While none of this would affect the reported result of the TAP test, which is already determined, it could be very confusing when one is trying to understand from the logs what went wrong with a failed test. To fix, do the postmaster shutdowns in an END block rather than at object destruction time. The END block will execute at a well-defined (and reasonable) time during script termination, and it will stop the postmasters in order of PostgresNode object creation. (Perhaps we should change that to be reverse order of creation, but the main point here is that we now have control which we did not before.) Use "pg_ctl stop", not an asynchronous kill(SIGQUIT), so that we wait for the postmasters to shut down before proceeding with directory deletion. Deletion of temporary directories still happens in an unspecified order during global destruction, but I can see no reason to care about that once the postmasters are stopped. |
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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/.