org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: org.springframework.transaction.CannotCreateTransactionException:Could not open JDBC Connection for
transaction; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: User NUXUSERalready has more than 'max_user_connections' active connections
......
### Cause: org.springframework.transaction.CannotCreateTransactionException:Could not open JDBC Connection for transaction; nested exception
is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: User NUXUSER already has more than 'max_user_connections' active connections
......
以上这是email报警信息,还有应用页面报500,503,504错误信息。
1 半夜接到call之后,马上登陆db,检查128组db节点组的状况,发现有db00701和db10201的connections超过了2000次。
2 想到这2台好像是上周刚维护过ssd的db server,直接ssh进取查看 sshdb00701
3 进入db00701之后,ps -eaf|grep mysql,运行正常,查看错误日志信息,发现写入binlog频繁报错。
4 进入binlog 目录/data/binlog/,发现目录下面有100多个binlog,足够有5天以上的binlog,奇怪怎么会有这么多,不是有crontab任务每天移走2天前的binlog吗?马上crontab -l发现移走binlog的任务没有开启,突然一想到,不会binlog目录磁盘满了吧?
5 执行df -h,看到/data/binlog/确实 used 为100%了,赶紧手动移走binlog,之后3分钟过后,应用正常了,页面不报5XX的错误了,db00701和db10201的connections也正常了。
总结问题原因有二:
1 此次数据库 db server切换,山姆大叔的sa组在加监控的时候,粗心大意没有把binlog的监控给加上,所以没有及时报警通知磁盘满了。
2 我们db组也没有及时double confirmed这个monitor的事情。
看来以后还得更加仔细才行。
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