11:34 a.m.
[ http://jira.jboss.com/jira/browse/JGRP-620?page=comments#action_12388266 ]
P Eger commented on JGRP-620:
-----------------------------
Reproduction is difficult, since it was seen only during cluster churn. I will attempt to
reproduce however.
3 Questions WRT this, i can't seem to find the answer in the documentation:
1) Would "infinite hang" be the expected behaviour for RPC to a set of members,
some of whom potentially do not exist? Is this because the member may possibly rejoin?
2) Is there any way to adjust the above behaviour (i would like it to ERROR the members
who have left / were not in the cluster immediately)
3) I need to pass in the list here, because at times the member list i am RPCing to is not
necessarily all the members, it is a subset. Would a null for the list have additional
"atomicity" guarantees over and above channel.getView().getMembers()?
RpcDispatcher.callRemoteMethods() hangs
---------------------------------------
Key: JGRP-620
URL: http://jira.jboss.com/jira/browse/JGRP-620
Project: JGroups
Issue Type: Bug
Affects Versions: 2.5.1
Environment: RHEL4 64 bit: Linux svr5 2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16
17:13:42 EST 2007 x86_64 x86_64 x86_64 GNU/Linux
SUN JDK 1.5.0_12-b04 64 bit
Reporter: P Eger
Assigned To: Bela Ban
Fix For: 2.5.2, 2.6.1, 2.7
Attachments: stacktrace.txt, tcp-config.xml
RpcDispatcher.callRemoteMethods() hangs, while there is a lot of member churn at the time
(4 servers starting into a cluster of 4). 1 of the 4 server starting up is hung with the
attached stack trace.
-------------------------------------------------------------------
channel=new JChannel(jgroups_config_file);
channel.setOpt(Channel.AUTO_RECONNECT, Boolean.TRUE);
channel.addChannelListener(this);
//TODO: verify these startup params
//NOTE: deadlock detection leaks memory as of 2.5b2, do not use
disp=new RpcDispatcher(channel, null, this, this, false, true);
//force connect
channel.connect(clusterName);
MethodCall mc = new MethodCall("remoteBroadcastAvailability", new
Object[]{peer,sequence,serviceStatus,rotationStatus}, new
Class[]{Address.class,Long.class,ServiceStatus.class,RotationStatus.class});
disp.callRemoteMethods(channel.getView().getMembers(), mc, GroupRequest.GET_ALL, 0);
-------------------------------------------------------------------
Name: main
State: WAITING on java.util.HashMap@2d95bbec
Total blocked: 53 Total waited: 12
Stack trace:
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:474)
org.jgroups.blocks.GroupRequest.doExecute(GroupRequest.java:479)
org.jgroups.blocks.GroupRequest.execute(GroupRequest.java:190)
org.jgroups.blocks.MessageDispatcher.castMessage(MessageDispatcher.java:430)
org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:199)
org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:167)
org.jgroups.blocks.RpcDispatcher.callRemoteMethods(RpcDispatcher.java:163)
utils.cluster.PeerClusterManager.broadcastAvailability(PeerClusterManager.java:1110)
utils.cluster.PeerClusterManager.broadcastMyAvailability(PeerClusterManager.java:428)
init.InitManager.ensureInitialized(InitManager.java:552)
init.InitManager.__init(InitManager.java:409)
init.InitManager.init(InitManager.java:300)
init.ServletListener.contextInitialized(ServletListener.java:23)
org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3669)
org.apache.catalina.core.StandardContext.start(StandardContext.java:4104)
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
org.apache.catalina.core.StandardHost.start(StandardHost.java:718)
org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1012)
org.apache.catalina.core.StandardEngine.start(StandardEngine.java:442)
org.apache.catalina.core.StandardService.start(StandardService.java:450)
org.apache.catalina.core.StandardServer.start(StandardServer.java:683)
org.apache.catalina.startup.Catalina.start(Catalina.java:537)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:271)
org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:409)
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