[infinispan-issues] [JBoss JIRA] (ISPN-2736) ConcurrentModificationException in StateRequestCommand

[Radim Vansa (JIRA)]

Radim Vansa created ISPN-2736:
---------------------------------

             Summary: ConcurrentModificationException in StateRequestCommand 
                 Key: ISPN-2736
                 URL: https://issues.jboss.org/browse/ISPN-2736
             Project: Infinispan
          Issue Type: Bug
          Components: State transfer
    Affects Versions: 5.2.0.CR2
            Reporter: Radim Vansa
            Assignee: Mircea Markus
            Priority: Critical


I have tried async replication scenario with async marshalling (optimistic transactions) and this has occurred:

{code}
04:34:15,182 ERROR [org.infinispan.remoting.rpc.RpcManagerImpl] (OOB-77,edg-perf11-48420) ISPN000073: Unexpected error while replicating
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
	at org.infinispan.statetransfer.StateProviderImpl.collectTransactionsToTransfer(StateProviderImpl.java:239)
	at org.infinispan.statetransfer.StateProviderImpl.getTransactionsForSegments(StateProviderImpl.java:200)
	at org.infinispan.statetransfer.StateRequestCommand.perform(StateRequestCommand.java:88)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handleInternal(InboundInvocationHandlerImpl.java:101)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handleWithWaitForBlocks(InboundInvocationHandlerImpl.java:122)
	at org.infinispan.remoting.InboundInvocationHandlerImpl.handle(InboundInvocationHandlerImpl.java:86)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.executeCommandFromLocalCluster(CommandAwareRpcDispatcher.java:245)
	at org.infinispan.remoting.transport.jgroups.CommandAwareRpcDispatcher.handle(CommandAwareRpcDispatcher.java:218)
	at org.jgroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:484)
	at org.jgroups.blocks.RequestCorrelator.receiveMessage(RequestCorrelator.java:391)
	at org.jgroups.blocks.RequestCorrelator.receive(RequestCorrelator.java:249)
	at org.jgroups.blocks.MessageDispatcher$ProtocolAdapter.up(MessageDispatcher.java:598)
	at org.jgroups.JChannel.up(JChannel.java:707)
{code}

Seems that StateRequestCommand is iterating through all transactions' locked keys but the collections of these locked keys can be modified by interfering prepare/commit.

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