emqx4.3/changes/ee/fix-14362.en.md

Updated our MySQL driver, so that some crashes and problems recovering from such crashes are fixed.

For example, such problems would manifest with logs similar to the following:

crasher: initial call: mysql_conn:init/1, pid: <0.8940.0>, registered_name: [], exit: {timeout,[{gen_server,init_it,6,[{file,\"gen_server.erl\"},{line,961}]},{proc_lib,init_p_do_apply,3,[{file,\"proc_lib.erl\"},{line,241}]}]}
Supervisor: {<0.8938.0>,ecpool_worker_sup}. Context: start_error. Reason: timeout. Offender: id={worker,1},pid=undefined.
Generic server <0.23934.0> terminating. Reason: {{case_clause,{error,closed}},[{mysql_protocol,fetch_response,7,[{file,\"mysql_protocol.erl\"},{line,569}]},{mysql_conn,query,4,[{file,\"mysql_conn.erl\"},{line,648}]},{mysql_conn,handle_call,3,[{file,\"mysql_conn.erl\"},{line,316}]},{gen_server,try_handle_call,4,[{file,\"gen_server.erl\"},{line,1131}]},{gen_server,handle_msg,6,[{file,\"gen_server.erl\"},{line,1160}]},{proc_lib,init_p_do_apply,3,[{file,\"proc_lib.erl\"},{line,241}]}]}
Supervisor: {<0.23913.0>,ecpool_worker_sup}. Context: shutdown. Reason: reached_max_restart_intensity. Offender: id={worker,8}