ProxySQL v1.3.0

Release date: 2016-10-19

Performance improvement

support for millions of connections. It is also able to handle workloads with hundreds thousands client connections, but only few connections are active. For example, 100k total connections, but only 100 active connections.
use of pthread_mutex for connection pool
several performance improvements

EXPERIMENTAL support for proepared statements
Connection Pool: each MySQL_Thread now has a pair thread, therefore the number of threads executed are mysql-threads x 2 . The second set of MySQL_Threads are responsible to only handle idle connections.
It also introduced two new global variables and a new global status:
- mysql-session_idle_ms (default 1000) : when a session is idle for that long, it is moved to a thread responsible to handle idle connections
- mysql-session_idle_show_processlist (default false) : specifies if idle connections are displayed on SHOW PROCESSLIST or on any query against stats_mysql_processlist
- Client_Connections_non_idle : returns the number of client connections that are not idle, therefore handled by the main MySQL_Threads and not moved to the second set of MySQL_Threads responsible to only handle idle connections
Network: add support for IPv6 #726 and #460, thanks to @ton31337
Connection Pool: support for SO_REUSEPORT, it can be only enabled on the command line with -r or --reuseport at startup
Query Processor: added new variable mysql-digests_lowercase to always set digest to lowercase #725

Query Processor: rules with only digest were matching everything #717
Query Processor: rules without digest where incorrectly displayed #719
General: Unix Socket Domain file was not removed at shutdown #714
MySQL Protocol: upgrade from mariadb-connector-c 2.1.0 to 2.3.1 due to several bugs
Connection Pool: server is not shunned if max_user_connections is reached for user #737