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From "Nauman Hameed (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-6550) Error occured while processing sync command
Date Mon, 26 Dec 2016 20:09:58 GMT
Nauman Hameed created AMQ-6550:
----------------------------------

             Summary: Error occured while processing sync command
                 Key: AMQ-6550
                 URL: https://issues.apache.org/jira/browse/AMQ-6550
             Project: ActiveMQ
          Issue Type: Bug
          Components: Transport
    Affects Versions: 5.13.2
            Reporter: Nauman Hameed


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.

{code:xml}
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)
{code}

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



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