Based on MySQL 5.5.35, including all the bug fixes in it, Percona Server 5.5.35-33.0 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 5.5.35-33.0 milestone at Launchpad.
Percona Server has extended mysqlbinlog to provide SSL and compression support.
Percona Server has reduced the performance overhead of the User Statistics feature.
Fixed the assertion error caused by a race condition between one thread performing a tablespace delete and another doing a compressed page flush list relocation. Bug fixed #1227581.
mysqldump --innodb-optimize-keys was generating incorrect CREATE TABLE statements for partitioned tables. Bug fixed #1233841.
Default value for thread_pool_max_threads has been changed from 500 to 100 000 (the maximum supported number of connections), because limiting the total number of threads in the threadpool can result in deadlocks and uneven distribution of worker threads between thread groups in case of stalled connections. Bug fixed #1258097.
PURGE CHANGED_PAGE_BITMAPS BEFORE statement would delete the changed page data after the specified LSN and up to the start of the next bitmap file. If this data were to be used for fast incremental backups, its absence would cause Percona XtraBackup to fall back to the full-scan incremental backup mode. Bug fixed #1260035 (Andrew Gaul).
Debug server build would crash during InnoDB crash recovery if the crash recovery had found transactions that needed cleaning up. Bug fixed #1247305.
Other bugs fixed: bug #1082333.