update mysql.user set plugin='unix_socket';
flush privileges;
connect(localhost,USER,,test,MASTER_PORT,MASTER_SOCKET);
connect  fail,localhost,$USER;
ERROR HY000: Plugin 'unix_socket' is not loaded
ERROR HY000: Plugin 'unix_socket' is not loaded
install plugin unix_socket soname 'auth_socket.so';
connect(localhost,USER,,test,MASTER_PORT,MASTER_SOCKET);
ERROR 28000: Access denied for user 'USER'@'localhost'
ERROR 28000: Access denied for user 'USER'@'localhost'
update mysql.user set plugin='';
flush privileges;
uninstall plugin unix_socket;