New Features
Percona Server has implemented Backup Locks that can be used as a lightweight alternative to FLUSH TABLES WITH READ LOCK for taking physical and logical backups.
Percona Server has split a new LRU manager thread out of the InnoDB cleaner thread, that performs LRU flushes and evictions to refill the free lists.
Percona Server now has server-side support for TokuDB Compression option syntax.
Percona Server has implemented Slow Query Log Rotation and Expiration feature to provide users with better control of slow query log disk space usage.
Ability to change database for mysqlbinlog has been ported from Percona Server 5.1.
In order to comply with Linux distribution packaging standards Percona‘s version of libmysqlclient has been renamed to libperconaserver. The old name was conflicting with the upstream libmysqlclient. Except for packaging, libmysqlclient and libperconaserverclient of the same version do not have any differences. Users wishing to continue using libmysqlclient will have to install the corresponding package of their distribution, such as mysql-lib for CentOS and libmysqlclient18 for Ubuntu/Debian. Users wishing to build software against libperconaserverclient should install libperconaserverclient-dev package. An old version of Percona-built libmysqlclient will be available for download.
Bugs Fixed
The XtraDB version number in univ.i was incorrect. Bug fixed #1277383.
Percona Toolkit UDFs were only shipped with RPM packages. Bug fixed #1159625.
A debug server build will crash if, while performing a bulk insert to a partitioned table, one of the partitions will return a failure for end_bulk_insert handler call. Bug fixed #1204871 (upstream #71270).
Percona Server 5.6 installation on Debian would fail due to default config reference to /etc/mysql/conf.d which didn’t exist. Bug fixed #1206648.
Due to a regression in the buffer pool mutex split, a combination of InnoDB compression, write workload, and multiple active purge threads could lead to a server crash. Bug fixed #1247021.
Server would crash on startup when XA support functions were activated by a second storage engine. Fix for this bug was ported from MariaDB. Bug fixed #1255549 (upstream #47134).
FLUSH STATUS could cause a server crash on the next transaction commit if two XA-supporting storage engines are in use. Fix for this bug was ported from MariaDB. Bugs fixed #1255551 (upstream #70854).
auth_pam.so shared library needed for PAM Authentication Plugin was missing from RPM packages. Bug fixed #1268246.
Fix for bug #1227581, a buffer pool mutex split regression, was not complete, thus a combination of write workload to InnoDB compressed table and a tablespace drop could crash the server. Bug fixed #1269352.
Binary RPM packages couldn’t be built from source tarballs on Fedora 19. Bug fixed #1229598.
Percona Server compilation with Performance Schema turned off would fail due to regression introduced by the 5.6 priority mutex framework. Bug fixed #1272747.
The InnoDB page cleaner thread could have incorrectly decided whether the server is busy or idle on some of its iterations and consequently issue a too big flush list flushing request on a busy server, causing performance instabilities. Bug fixed #1238039 (upstream #71988).
Percona Server had different server version value when installing from Source and from Binary/RPM. Bug fixed #1244178.
InnoDB did not handle the cases of asynchronous and synchronous I/O requests completing partially or being interrupted. Bugs fixed #1262500 (upstream #54430), and #1263087 (Andrew Gaul).
The fix for upstream bug #70768 may cause a high rate of RW lock creations and destructions, resulting in a performance regression on some workloads. Bug fixed #1279671 (upstream #71708).
Debian and Ubuntu packaging has been reworked to meet the packaging standards. Bug fixed #1281261.
Fixed the CMake warnings that were happening when Makefile was generated. Bugs fixed #1274827, upstream bug fixed #71089 and #1274411 (upstream #71094).
On Ubuntu Precise multiple architecture versions of libmysqlclient18 couldn’t be installed side by side. Bug fixed #1052636.
Percona Server source tree has been reorganized to match the MySQL source tree layout closer. Bug fixed #1014477.
Performance schema autosizing heuristics have been updated to account for Percona Server-specific wait/synch/mutex/sql/THD::LOCK_temporary_tables mutex. Bug fixed #1264952.
Other bugs fixed: #1276445, #1005787, #1285064, #1229598, and #1277505 (upstream #71624).
