Based on MySQL 5.6.20, including all the bug fixes in it, Percona Server 5.6.20-68.0 is the current GA release in the Percona Server 5.6 series. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.6.20-68.0 milestone at Launchpad.
Percona Server has implemented the MySQL 5.7
SHOW SLAVE STATUS NONBLOCKINGsyntax for Lock-Free SHOW SLAVE STATUS feature. The existing
SHOW SLAVE STATUS NOLOCKis kept as a deprecated alias and will be removed in Percona Server 5.7. There were no functional changes for the feature.
TokuDB storage engine package has been updated to version 7.1.8.
INNODB_CHANGED_PAGESwith a range condition
START_LSN > x AND END_LSN < ywould lead to a server crash if the range was empty with x greater than y. Bug fixed #1202252 (Jan Lindström and Sergei Petrunia).
SQL statements of other connections were missing in the output of
SHOW ENGINE INNODB STATUS, in
LATEST DETECTED DEADLOCKand
TRANSACTIONSsections. This bug was introduced by Statement Timeout patch in Percona Server
5.6.13-61.0. Bug fixed #1328824.
Some of TokuDB distribution files were missing in the TokuDB binary tarball. Bug fixed #1338945.
With XtraDB changed page tracking feature enabled, queries from the
INNODB_CHANGED_PAGEScould read the bitmap data whose write was in still progress. This would cause the query to fail with an
ER_CANT_FIND_SYSTEM_RECand a warning printed to the server error log. The workaround is to add an appropriate
END_LSN-limiting condition to the query. Bug fixed #1193332.
The audit log plugin would write log with XML syntax errors when
NEWformats were used. Bug fixed #1320879.
If the bitmap directory has a bitmap file sequence with a start LSN of one file less than a start LSN of the previous file, a debug build would assert when queries were run on
INNODB_CHANGED_PAGEStable. Bug fixed #1342494.
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