我已经启动了mysql服务，但无法为以下错误代码启动mysql服务。我有3个节点，但2个节点正在运行
mysql.service - Percona XtraDB Cluster
Loaded: loaded (/usr/lib/systemd/system/mysql.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Wed 2019-11-11 07:36:08 CST; 4h 19min ago
Process: 29016 ExecStopPost=/usr/bin/mysql-systemd stop-post (code=exited, status=0/SUCCESS)
Process: 28972 ExecStop=/usr/bin/mysql-systemd stop (code=exited, status=2)
Process: 27824 ExecStartPost=/usr/bin/mysql-systemd start-post $MAINPID (code=exited, status=1/FAILURE)
Process: 27822 ExecStart=/usr/bin/mysqld_safe --basedir=/usr (code=exited, status=0/SUCCESS)
Process: 27752 ExecStartPre=/usr/bin/mysql-systemd start-pre (code=exited, status=0/SUCCESS)
Main PID: 27822 (code=exited, status=0/SUCCESS)
mysql-systemd[17824]: ERROR! mysqld_safe with PID 17822 has already exited: FAILURE
systemd[1]: mysql.service: control process exited, code=exited status=1
mysql-systemd[18972]: WARNING: mysql pid file /data/data/mysqld.pid empty or not readable
mysql-systemd[18972]: ERROR! mysql already dead
systemd[1]: mysql.service: control process exited, code=exited status=2
mysql-systemd[19016]: WARNING: mysql pid file /data/data/mysqld.pid empty or not readable
mysql-systemd[19016]: WARNING: mysql may be already dead
Failed to start Percona XtraDB Cluster.
Unit mysql.service entered failed state.
mysql.service failed