wsrep patch for MySQL

This is a major maintenance release for the MySQL 5.5 series. It has upgraded to MySQL 5.5.20 and wsrep API v23. It has full foreign key support (requires Galera 2.0). It fixes a number of possible deadlocks involving MDL and GRL, fixes replication of view, trigger, event, function, and procedure definers, and fixes total order isolation for CREATE...SELECT... statement. It drops the usage of the InnoDB drop queue (a major consistency threat). It fixes slow query logging, fixes a self-crash due to "semaphore wait has lasted > 600 seconds" during rsync SST, and has many other bugfixes.

This is a maintenance release for the MySQL 5.1 series. It has been upgraded to MySQL 5.1.61 and wsrep API v23. It has full foreign key support (with Galera 2.0). It fixes total order isolation for the CREATE..SELECT statement, fixes a self-crash due to "semaphore wait has lasted > 600 seconds" during rsync SST, fixes replication of a function call result when called from SELECT, and has miscellaneous fixes and improvements in state transfer code.

This is a major bugfix release. Fixed bugs include a segfault on broken DDL, incompatibility with standard replication, mysqladmin not working when a node is not SYNCED, parallel applying broken on tables with no primary keys, deadlocks on NULL unique keys, bugs in state transfer, group communication, and others.
MySQL has been updated to 5.1.59 and 5.5.17. New feature: Rolling Schema Upgrade.

Galera Cluster for MySQL milestone 1.0 reached. New in this release: support for both MySQL 5.5.15 and 5.1.58, on-disk writeset caching, strictly synchronous reads, improved stability in WAN, and Severalnines' ClusterControl(tm) GUI configurator and monitoring tool.

This release was updated for MySQL 5.1.58 and fixed problems where the secondary index was not fully supported, cascading foreign keys caused crashes in the InnoDB plugin, bad SST requests could destroy the database on the donor, and large LOAD DATA files were not supported. wsrep_cluster_name, wsrep_node_name, and wsrep_sst_* variables can now be changed at run-time.