改进内容：
1. A node join operation could lead to a crash if the joining node
were connected before the DB state transfer to joining node had
started. This has been fixed.
2. Loading a large MySQL dump file
could lead to an out of memory situation if it contained LOCK
statements and wsrep_convert_LOCK_to_trx was set to 1.
3. Now by
default, wsrep_convert_LOCK_to_trx is set to 0.
4. This release has
been updated to MySQL 5.1.42.
下载地址： http://www.codership.com/en/downloads/galera
