最近项目中频繁出现 Lock wait timeout exceeded; try restarting transaction这个错误,把我们弄得痛苦不堪啊,为了解决问题,上网上找好多资料,终于把问题复现了。具体操作步骤如下(我使用的mysql工具是 navicat):
第一步:开启sql命令页面
第二步:输入start transaction;开启一个事务
第三步:输入update语句 UPDATE TABLENAME set time=null where id=29163;(切记不要 提交(commit;))
第四步:书写测试类
public class StTest implements Runnable{ private static ApplicationContext applicationContext=null; private static AtomicInteger a=new AtomicInteger(0); static { applicationContext=new ClassPathXmlApplicationContext("classpath:application.xml"); } public static void main(String[] args) throws Exception { ExecutorService executorService = Executors.newFixedThreadPool(10); for (int i = 0; i <10 ; i++) { executorService.execute(new aaaa()); } if(!executorService.isTerminated()){ executorService.shutdown(); } } @Override public void run() { XXXService bean = applicationContext.getBean(XXXService.class); XXXBeand xx= null; try { xx= bean.byId(254213); } catch (Exception e) { e.printStackTrace(); } long aaa=System.currentTimeMillis(); for (int i = 0; i < 10; i++) { try { bean.update(xx); } catch (Exception e) { e.printStackTrace(); } } System.out.println(System.currentTimeMillis()-aaa); } }
运行程序并且运行下面3个sql查看结果
SELECT * FROM information_schema.INNODB_TRX; select * from information_schema.innodb_lock_waits; select * from information_schema.innodb_locks;
得到以下运行结果。我们发现有其他几个的 trx_state 状态是LOCK WAIT,得到我们要复现的结果
第五步:等待错误出现,在我们等待一段时间之后会发现程序报错
Caused by: java.sql.SQLException: Lock wait timeout exceeded; try restarting transaction at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3491) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3423) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1936) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:995) at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:493) at sun.reflect.GeneratedMethodAccessor21.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:55) at com.sun.proxy.$Proxy17.execute(Unknown Source) at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:41) at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:66) at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:45) at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:100) at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:75) at sun.reflect.GeneratedMethodAccessor35.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:59) at com.sun.proxy.$Proxy15.update(Unknown Source) at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:148) at sun.reflect.GeneratedMethodAccessor34.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:354) ... 20 more
从上面得到的结果,可以知道这个错误是在一个事务没有提交的时候,其他事务也操作相同对象导致的,那么找到了问题的原因,我们就可以针对这种情况进行修改了。
这是本次我遇到的错误,分享给大家一下,以避免程序中遇到这样的情况。
原创文章,作者:ItWorker,如若转载,请注明出处:https://blog.ytso.com/tech/database/4642.html