@[TOC](记录一次MySql锁等待 (Lock wait timeout exceeded)异常)

Java执行一个SQL查询未提交，遇到1205错误。

java.lang.Exception:
### Error updating database.  Cause: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction

ClusterManager: Error managing cluster: Failure recovering jobs: Lock wait timeout exceeded; try restarting transaction

解决办法：
执行mysql命令:

SELECT * FROM information_schema.innodb_trx;

然后找出trx_state值为“LOCK WAIT”的记录，根据记录中查询语句的系统id（trx_mysql_thread_id）：kill掉被锁住的线程id

KILL trx_mysql_thread_id ;