Re: [jgroups-users] Deadlock in JGroups

On 16/03/16 19:10, Questions/problems related to using JGroups wrote:
> Hello All,
>
> I need some help here. We are using jboss-4.2.0-GA with JGroups 2.4.1
> SP-3 on jdk 1.6 in a clustered environment of 60 servers.

Ouch! I don't support such an old version of JGroups.


> It runs fine
> for days but suddenly all threads get blocked for several minutes.  I
> have captured thread dumps when this happened yesterday.  We are seeing
> below in all the thread dumps. Appreciate any help. Should i upgrade
> jgroups to solve this issue?.

Most absolutely positively definitely! :-) JBoss 4.2 is also from the 
stone age, and JDK 1.6 has been EOLed (a long time ago)...

> daemon prio=10 tid=0x00007f54d80f0000 nid=0x464 in Object.wait()
> [0x00007f548a907000]
>       java.lang.Thread.State: TIMED_WAITING (on object monitor)
>       at java.lang.Object.wait(Native Method)
>       - waiting on <0x00000007ddd76e50> (a java.util.HashMap)
>       at org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:501)
>       - locked <0x00000007ddd76e50> (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.jndi.TreeHead.lookup(TreeHead.java:228)
>       at org.jboss.ha.jndi.HAJNDI.lookup(HAJNDI.java:155)
>       at sun.reflect.GeneratedMethodAccessor189.invoke(Unknown Source)
>       at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>       at java.lang.reflect.Method.invoke(Method.java:597)
>       at
> org.jboss.ha.framework.interfaces.HARMIClient.invoke(HARMIClient.java:258)
>       at $Proxy332.lookup(Unknown Source)
>       at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:625)
>       at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:587)
>       at javax.naming.InitialContext.lookup(InitialContext.java:392)
>       at tlm.toc.common.utils.JNDIUtils.lookup(JNDIUtils.java:128)
>       - locked <0x0000000780d72b70> (a java.util.HashMap)
>       at
> hti.provisioning.ws.ProvisioningWS.tcuProvisioningCommand(ProvisioningWS.java:80)
>       at sun.reflect.GeneratedMethodAccessor221.invoke(Unknown Source)
>       at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>
>
> Thanks,
>
> Vamshi J.
>
>
>
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-- 
Bela Ban, JGroups lead (http://www.jgroups.org)


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