[jboss-user] [Clustering/JBoss] - Re: strace shows futex

[bstansberry@jboss.com]

  | "main" prio=1 tid=0x0817a910 nid=0xaf5 in Object.wait() [0xa7270000..0xa72720b0]
  | 	at java.lang.Object.wait(Native Method)
  | 	- waiting on <0xe91e7988> (a java.util.HashMap)
  | 	at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:501)
  | 	- locked <0xe91e7988> (a java.util.HashMap)
  | 	at org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:193)
  | 	at org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:431)
  | 	at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:192)
  | 	at org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:163)
  | 	at org.jboss.ha.framework.server.HAPartitionImpl.callMethodOnCluster(HAPartitionImpl.java:797)
  | 	at org.jboss.ha.framework.server.HAPartitionImpl.callMethodOnCluster(HAPartitionImpl.java:773)
  | 	at org.jboss.ha.framework.server.DistributedReplicantManagerImpl.add(DistributedReplicantManagerImpl.java:405)
  | 	at org.jboss.ha.jmx.HAServiceMBeanSupport.registerDRMListener(HAServiceMBeanSupport.java:255)
  | 	at org.jboss.ha.jmx.HAServiceMBeanSupport.startService(HAServiceMBeanSupport.java:177)

Shows the thread doing a deployment blocking waiting for a response from a group RPC.  That response should either come in or the thread will unblock w/in 60 secs. (The 60 secs is configured in cluster-service.xml via the MethodCallTimeout attribute).

It's unlikely that you just got unlucky and did the stack trace while that thread was waiting a few ms for a normal response. So, most likely something on another node is delaying/preventing the response. You can take stack traces on other nodes to see if they tell you anything. In particular you want to look at the IncomingPacketHandler threads.

All the other threads in what you posted seem ok.

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