[jboss-jira] [JBoss JIRA] Created: (JGRP-896) GMS: ConcurrentModificationException in AckCollector.handleView()

[John Doe (JIRA)]

GMS: ConcurrentModificationException in AckCollector.handleView()
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                 Key: JGRP-896
                 URL: https://jira.jboss.org/jira/browse/JGRP-896
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.6.5
            Reporter: John Doe
            Assignee: Bela Ban


We encountered the following CME exception on one of our production environment:

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.remove(HashMap.java:860)
	at java.util.AbstractCollection.retainAll(AbstractCollection.java:393)
	at org.jgroups.util.AckCollector.handleView(AckCollector.java:85)
	at org.jgroups.protocols.pbcast.GMS.installView(GMS.java:479)
	at org.jgroups.protocols.pbcast.CoordGmsImpl.handleViewChange(CoordGmsImpl.java:460)
	at org.jgroups.protocols.pbcast.GMS.up(GMS.java:711)
	at org.jgroups.protocols.VIEW_SYNC.up(VIEW_SYNC.java:192)
	at org.jgroups.protocols.pbcast.STABLE.up(STABLE.java:233)
	at org.jgroups.protocols.UNICAST.up(UNICAST.java:299)
	at org.jgroups.protocols.pbcast.NAKACK.handleMessage(NAKACK.java:861)
	at org.jgroups.protocols.pbcast.NAKACK.up(NAKACK.java:693)
	at org.jgroups.protocols.BARRIER.up(BARRIER.java:136)
	at org.jgroups.protocols.VERIFY_SUSPECT.up(VERIFY_SUSPECT.java:167)
	at org.jgroups.protocols.FD_ALL.up(FD_ALL.java:203)
	at org.jgroups.protocols.FD_SOCK.up(FD_SOCK.java:308)
	at org.jgroups.protocols.MERGE2.up(MERGE2.java:144)
	at org.jgroups.protocols.Discovery.up(Discovery.java:263)
	at org.jgroups.protocols.TP.passMessageUp(TP.java:1275)
	at org.jgroups.protocols.TP.access$100(TP.java:49)
	at org.jgroups.protocols.TP$1.run(TP.java:1178)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
	at java.lang.Thread.run(Thread.java:595)


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