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Based on MySQL 5.5.31, including all the bug fixes in it, Percona Server 5.5.31-30.3 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 5.5.31-30.3 milestone at Launchpad.
Percona Server has ported the Atomic write support for Fusion-io devices patch from MariaDB. This feature adds atomic write support for directFS filesystem on Fusion-io devices. This feature implementation is considered BETA quality.
Percona Server has introduced innodb_read_views_memory and innodb_descriptors_memory status variables in the Extended Show Engine InnoDB Status to improve InnoDB memory usage diagnostics.
Fixed the Percona-Server-shared-55 and Percona-XtraDB-Cluster-shared RPM package dependences. Bug fixed #1050654.
If a slave was running with its binary log enabled and then restarted with the binary log disabled, Crash-Resistant Replication could overwrite the relay log info log with an incorrect position. Bug fixed #1092593.
Fixed the CVE-2012-5615 vulnerability. This vulnerability would allow remote attacker to detect what user accounts exist on the server. This bug fix comes originally from MariaDB (see MDEV-3909). Bug fixed #1171941.
Fixed the CVE-2012-5627 vulnerability, where an unprivileged MySQL account owner could perform brute-force password guessing attack on other accounts efficiently. This bug fix comes originally from MariaDB (see MDEV-3915). Bug fixed #1172090.
mysql_set_permission was failing on Debian due to missing libdbd-mysql-perl package. Fixed by adding the package dependency. Bug fixed #1003776.
Rebuilding Debian source package would fail because dpatch and automake were missing from build-dep. Bug fixed #1023575 (Stephan Adig).