三节点的Percona XtraDB Cluster，现在主节点挂了起不来，怎么排查，谢谢

root@mysql03:/var/log/mysql# /usr/bin/clustercheck sstuser s3cretPass 0
HTTP/1.1 503 Service Unavailable
Content-Type: text/plain
Connection: close
Content-Length: 44

Percona XtraDB Cluster Node is not synced.

root@mysql03:/var/log/mysql# service mysql start
* Stale sst_in_progress file in datadir mysqld * Starting MySQL (Percona XtraDB Cluster) database server mysqld * State transfer in progress, setting sleep higher mysqld
* The server quit without updating PID file (/var/run/mysqld/mysqld.pid).
[fail]
root@mysql03:/var/log/mysql#
root@mysql03:/var/log/mysql# service mysql status
* MySQL (Percona XtraDB Cluster) is stopped. Check log