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Date: Fri, 23 Dec 2016 05:28:44 -0800 (PST)
From: nauman73 <nauman73@hotmail.com>
To: users@activemq.apache.org
Message-ID: <1482499724791-4720745.post@n4.nabble.com>
Subject: Error occured while processing sync command
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archived-at: Fri, 23 Dec 2016 16:16:04 -0000

Hi Guys

I have a two machine setup with an ActiveMQ broker on each. Applications on
both machines use the local broker to send status messages to each other. We
were doing some testing to see the impact of network disconnect and
reconnect on one machine, so we did network unplug and re-plug cycles on one
machine (machine A) again and again with some delay (around 5 minutes
delay). The brokers reconnected fine and applications were able to exchange
status message on all but one such cycle. In the problem cycle machine A was
unable to receive messages after network re-connect. On some investigation,
we can see following exception in the machine B ActiveMQ logs.

2016-12-22 08:43:14,524 | DEBUG | Error occured while processing sync
command: ConsumerInfo {commandId = 4, responseRequired = true, consumerId =
CCM-UACSCHP002->CCM-UACSCHP001-64290-1482319725974-53:1:1:2, destination =
topic://EEP, prefetchSize = 100, maximumPendingMessageLimit = 0, browser =
false, dispatchAsync = true, selector = null, clientId = null,
subscriptionName = NC-DS_CCM-UACSCHP002_EEP, noLocal = false, exclusive =
false, retroactive = false, priority = 0, brokerPath =
[ID:ccm-uacschp001-49159-1482188226837-0:1], optimizedAcknowledge = false,
noRangeAcks = false, additionalPredicate =
org.apache.activemq.command.NetworkBridgeFilter@e714024}, exception:
java.lang.NullPointerException |
org.apache.activemq.broker.TransportConnection.Service |
triggerStartAsyncNetworkBridgeCreation:
remoteBroker=tcp://CCM-UACSCHP001/10.49.224.23:61616@65477, localBroker=
vm://CCM-UACSCHP002#172
java.lang.NullPointerException
	at
org.apache.activemq.broker.TransportConnector.isAllowLinkStealing(TransportConnector.java:582)
	at
org.apache.activemq.broker.ConnectionContext.isAllowLinkStealing(ConnectionContext.java:337)
	at
org.apache.activemq.broker.region.TopicRegion.addConsumer(TopicRegion.java:128)
	at
org.apache.activemq.broker.region.RegionBroker.addConsumer(RegionBroker.java:427)
	at
org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
	at
org.apache.activemq.advisory.AdvisoryBroker.addConsumer(AdvisoryBroker.java:128)
	at
org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
	at
org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
	at
org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
	at
org.apache.activemq.broker.MutableBrokerFilter.addConsumer(MutableBrokerFilter.java:108)
	at
org.apache.activemq.broker.util.LoggingBrokerPlugin.addConsumer(LoggingBrokerPlugin.java:186)
	at
org.apache.activemq.broker.BrokerFilter.addConsumer(BrokerFilter.java:103)
	at
org.apache.activemq.broker.MutableBrokerFilter.addConsumer(MutableBrokerFilter.java:108)
	at
org.apache.activemq.broker.TransportConnection.processAddConsumer(TransportConnection.java:671)
	at org.apache.activemq.command.ConsumerInfo.visit(ConsumerInfo.java:351)
	at
org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:338)
	at
org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:188)
	at
org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
	at
org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
	at
org.apache.activemq.transport.vm.VMTransport.doDispatch(VMTransport.java:162)
	at
org.apache.activemq.transport.vm.VMTransport.dispatch(VMTransport.java:154)
	at
org.apache.activemq.transport.vm.VMTransport.oneway(VMTransport.java:131)
	at
org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:68)
	at
org.apache.activemq.transport.ResponseCorrelator.asyncRequest(ResponseCorrelator.java:81)
	at
org.apache.activemq.transport.ResponseCorrelator.request(ResponseCorrelator.java:86)
	at
org.apache.activemq.network.DemandForwardingBridgeSupport.addSubscription(DemandForwardingBridgeSupport.java:920)
	at
org.apache.activemq.network.DurableConduitBridge.setupStaticDestinations(DurableConduitBridge.java:79)
	at
org.apache.activemq.network.DemandForwardingBridgeSupport.doStartLocalAndRemoteBridges(DemandForwardingBridgeSupport.java:436)
	at
org.apache.activemq.network.DemandForwardingBridgeSupport.access$500(DemandForwardingBridgeSupport.java:105)
	at
org.apache.activemq.network.DemandForwardingBridgeSupport$5.run(DemandForwardingBridgeSupport.java:336)
	at java.lang.Thread.run(Unknown Source)

This exception appears in machine B ActiveMQ logs shortly after the network
of machine A is re-connected.

Does this point to an obvious issue or do I need to provide more details for
this issue?

Any help is much appreciated.

Thanks


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