记一次压测数据死锁问题：并发场景为秒杀减库存的场景，使用Jmeter并发调用秒杀接口，秒杀使用数据库乐观锁，主键更新，正常来说不会有死锁问题。分析框架的日志肯定不能找出什么问题，最后再mysql的binlog里面发现了死锁的原因，Deep or long search in the lock table wait-for graph we will rollback transaction。经过官网文档解释：当事务等待超过200 （参数LOCK_MAX_DEPTH_IN_DEADLOCK_CHECK默认值200），mysql会认为发生了死锁，从而回滚事务。以下截图为官网说明：
web框架日志：
ERROR 06-27 17:46:19(Log4jFilter.java:152): {conn-10236, pstmt-21039} execute error. UPDATE coupon_pack_share cps SET cps.receiveCount = cps.receiveCount + 1 WHERE cps.shareId = ? AND cps.receiveCount + 1<= cps.limitCount
com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction
at sun.reflect.GeneratedConstructorAccessor53.newInstance(Unknown
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:526)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1065)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
mysql 日志：
