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Based on MySQL 5.5.17, including all the bug fixes in it, Percona Server 5.5.17-22.1 is now the current stable release in the 5.5 series. All of Percona ‘s software is open-source and free, all the details of the release can be found in the 5.5.17-22.1 milestone at Launchpad.
- MyISAM repair-by-sort buffer could not be greater than 4GB even on 64bit architectures. Bug Fixed: #878404 (Alexey Kopytov).
- The kill idle transactions feature in XtraDB (if enabled) could sometimes cause the server to crash. Bug Fixed: #871722 (Yasufumi Kinoshita).
- In a master-master setup when using SET user variables it was possible to have SHOW SLAVE STATUS give incorrect output due to a corrupted relay log. Bug Fixed: #860910 (Alexey Kopytov).