Tomcat集群失败并生成大量日志

Question

我的 Tomcat 6 集群（2 个节点）会定期出现问题。其中一个节点会失控并生成大量重复以下内容的日志：

Aug 25, 2009 11:44:10 AM org.apache.catalina.ha.session.DeltaRequest reset
SEVERE: Unable to remove element
java.util.NoSuchElementException
        at java.util.LinkedList.remove(LinkedList.java:788)
        at java.util.LinkedList.removeFirst(LinkedList.java:134)
        at org.apache.catalina.ha.session.DeltaRequest.reset(DeltaRequest.java:201)
        at org.apache.catalina.ha.session.DeltaRequest.execute(DeltaRequest.java:195)
        at org.apache.catalina.ha.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1364)
        at org.apache.catalina.ha.session.DeltaManager.messageReceived(DeltaManager.java:1320)
        at org.apache.catalina.ha.session.DeltaManager.messageDataReceived(DeltaManager.java:1083)
        at org.apache.catalina.ha.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:87)
        at org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:916)
        at org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:897)
        at org.apache.catalina.tribes.group.GroupChannel.messageReceived(GroupChannel.java:264)
        at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
        at org.apache.catalina.tribes.group.interceptors.TcpFailureDetector.messageReceived(TcpFailureDetector.java:110)
        at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
        at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
        at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
        at org.apache.catalina.tribes.group.ChannelCoordinator.messageReceived(ChannelCoordinator.java:241)
        at org.apache.catalina.tribes.transport.ReceiverBase.messageDataReceived(ReceiverBase.java:225)
        at org.apache.catalina.tribes.transport.nio.NioReplicationTask.drainChannel(NioReplicationTask.java:188)
        at org.apache.catalina.tribes.transport.nio.NioReplicationTask.run(NioReplicationTask.java:91)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
        at java.lang.Thread.run(Thread.java:619)

这是它唯一显示的内容。此时集群中的另一个节点仍然处于活动状态。没有什么可做的，只能重新启动。大量的日志也多次导致磁盘空间问题。

有人知道这里出了什么问题吗？

谢谢！ 黄

Answer 1

似乎是 Tomcat 6 中的一个错误。如果您查看源代码：

http://www.java2s.com/Open-Source/Java-Document/Sevlet-Container/apache-tomcat -6.0.14/org/apache/catalina/ha/session/DeltaRequest.java.htm（第225行）

您将看到reset()方法可能会抛出此异常。建议您联系Tomcat开发人员解决此问题。