我有一些工作线程正在运行,使用 MySQL 和 mysql-connector-java-5.1.20。当我杀死一些 SQL 语句(使用 mysql 客户端的 kill “connection id”)时,java 线程挂起,这应该会引发一些异常。
jstack 打印:
"quartzBase$child#45e3dd3c_Worker-3" prio=10 tid=0x00007f960004c800 nid=0x713d runnable [0x00007f943b3a0000]
java.lang.Thread.State: RUNNABLE
at java.net.PlainSocketImpl.socketAvailable(Native Method)
at java.net.PlainSocketImpl.available(PlainSocketImpl.java:472)
- locked <0x00007f9e11fe13a8> (a java.net.SocksSocketImpl)
at java.net.SocketInputStream.available(SocketInputStream.java:217)
at com.mysql.jdbc.util.ReadAheadInputStream.available(ReadAheadInputStream.java:232)
at com.mysql.jdbc.MysqlIO.clearInputStream(MysqlIO.java:981)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2426)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
- locked <0x00007f9e17de2b50> (a com.mysql.jdbc.JDBC4Connection)
at com.mysql.jdbc.ConnectionImpl.rollbackNoChecks(ConnectionImpl.java:4863)
at com.mysql.jdbc.ConnectionImpl.rollback(ConnectionImpl.java:4749)
- locked <0x00007f9e17de2b50> (a com.mysql.jdbc.JDBC4Connection)
at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:368)
at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.rollback(PoolingDataSource.java:323)
at org.hibernate.transaction.JDBCTransaction.rollbackAndResetAutoCommit(JDBCTransaction.java:217)
at org.hibernate.transaction.JDBCTransaction.rollback(JDBCTransaction.java:196)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doRollback(HibernateTransactionManager.java:676)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processRollback(AbstractPlatformTransactionManager.java:845)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.rollback(AbstractPlatformTransactionManager.java:822)
at org.springframework.transaction.interceptor.TransactionAspectSupport.completeTransactionAfterThrowing(TransactionAspectSupport.java:430)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:112)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy1021.process(Unknown Source)
使用 jvmtop,我看到了这个:
JvmTop 0.8.0 alpha - 22:48:37, amd64, 24 cpus, Linux 2.6.32-35, load avg 11.53
http://code.google.com/p/jvmtop
Profiling PID 27403: com.caucho.server.resin.Resin --root-dir
36.41% ( 0.22s) com.mysql.jdbc.util.ReadAheadInputStream.available()
33.42% ( 0.20s) ....opensymphony.xwork2.conversion.impl.DefaultTypeConve()
30.17% ( 0.18s) com.mysql.jdbc.util.ReadAheadInputStream.fill()
0.00% ( 0.00s) com.rabbitmq.client.impl.Frame.readFrom()
工作线程永远不会接受新任务。
任何想法?