[mysql] com.netflix.zuul.exception.ZuulException: Hystrix Readed time out Gateway Timeout 504

今天遇到这个问题是因为mysql 里有个事务一直没结束，

导致其他线程进来后一直等待锁

模块报错Caused by: com.mysql.cj.jdbc.exceptions.MySQLTransactionRollbackException: Lock wait timeout exceeded; try restarting transaction

解决：

//获取事务 
SELECT * FROM information_schema.innodb_trx;　
//获取锁
　SELECT * FROM information_schema.innodb_locks;
　　//获取当前正在工作线程与锁的关系
　SELECT * FROM information_schema.innodb_lock_waits ;
杀掉对应的进程
　　kill 3774;