Based on MySQL 5.5.36, including all the bug fixes in it, Percona Server 5.5.36-34.1 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 5.5.36-34.1 milestone at Launchpad.
After installing the auth_socket plugin any local user might get root access to the server. If you’re using this plugin upgrade is advised. This is a regression, introduced in Percona Server 5.5.31-30.3. Bug fixed #1289599.
The new client and server packages included files with paths that were conflicting with the ones in mysql-libs package on CentOS. Bug fixed #1278516.
A clean installation of Percona-Server-server-55 on CentOS would fail due to a typo in mysql_install_db call. Bug fixed #1291247.
Percona-Server-shared-55 package was still declared as providing mysql-libs, but it is not actually providing it anymore. Bug fixed #1291249.
This release fixes some of the issues caused by the libmysqlclient rename to libperconaserverclient in Percona Server 5.5.36-34.0. 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 who previously compiled software against Percona-provided libmysqlclient will either need to install the corresponding package of their distribution, such as mysql-lib for CentOS and libmysqlclient18 for Ubuntu/Debian or recompile against libperconaserverclient. Another workaround option is to create a symlink from libperconaserverclient.so.18.0.0 to libmysqlclient.so.18.0.0.