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MariaDB server is a community developed fork of MySQL server. Started by core members of the original MySQL team, MariaDB actively works with outside developers to deliver the most featureful, stable, and sanely licensed open SQL server in the industry.
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The cause of im_daemon_life_cycle.imtest random failures was the following behaviour of some implementations of LINUX threads: let's suppose that a process has several threads (in LINUX threads, there is a separate process for each thread). When the main process gets killed, the parent receives SIGCHLD before all threads (child processes) die. In other words, the parent receives SIGCHLD, when its child is not completely dead. In terms of IM, that means that IM-angel receives SIGCHLD when IM-main is not dead and still holds some resources. After receiving SIGCHLD, IM-angel restarts IM-main, but IM-main failed to initialize, because previous instance (copy) of IM-main still holds server socket (TCP-port). Another problem here was that IM-angel restarted IM-main only if it was killed by signal. If it exited with error, IM-angel thought it's intended / graceful shutdown and exited itself. So, when the second instance of IM-main failed to initialize, IM-angel thought it's intended shutdown and quit. The fix is 1. to change IM-angel so that it restarts IM-main if it exited with error code; 2. to change IM-main so that it returns proper exit code in case of failure. |
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| README | ||
This is a release of MySQL, a dual-license SQL database server. MySQL is brought to you by the MySQL team at MySQL AB. License information can be found in these files: - For GPL (free) distributions, see the COPYING file and the EXCEPTIONS-CLIENT file. - For commercial distributions, see the LICENSE.mysql file. For further information about MySQL or additional documentation, see: - The latest information about MySQL: http://www.mysql.com - The current MySQL documentation: http://dev.mysql.com/doc Some manual sections of special interest: - If you are migrating from an older version of MySQL, please read the "Upgrading from..." section first! - To see what MySQL can do, take a look at the features section. - For installation instructions, see the Installing and Upgrading chapter. - For the new features/bugfix history, see the Change History appendix. - For the currently known bugs/misfeatures (known errors) see the Problems and Common Errors appendix. - For a list of developers and other contributors, see the Credits appendix. A local copy of the MySQL Reference Manual can be found in the Docs directory in GNU Info format. You can also browse the manual online or download it in any of several formats at the URL given earlier in this file. ************************************************************ IMPORTANT: Bug or error reports should be sent to http://bugs.mysql.com.