Percona Server 5.1.57-12.8 is now the current stable release in the 5.1 series. It is is based on MySQL 5.1.57.
- Fixed InnoDB I/O code so that the interrupted system calls are restarted if they are interrupted by a signal. InnoDB I/O code was not fully conforming to the standard on POSIX systems, causing a crash with an assertion failure when receiving a signal on pwrite(). Bug Fixed: LP #764395 / MySQL bug #60788 (A. Kopytov).
- The maximum value for innodb_use_purge_threads has been corrected to 32 (maximum number of parallel threads in a parallelized operation). The Dedicated Purge Thread patch accepted a value up to 64 for the innodb_use_purge_thread variable, leading to an assertion failure for greater than the actual maximum. Bug Fixed: #755017 (L. Biveinis).
- Increased the treshold of 600 seconds during the import, which was causing issues when importing big tables. Bug Fixed #684829 (Y. Kinoshita).
- The innodb_use_sys_stats_table feature could cause a crash under high concurrency Bug Fixed #791092 (Y. Kinoshita).
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