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From "Chris Hofstaedter (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-1120) Race Condition can result in hang on remoteBrokerNameKnownLatch
Date Fri, 05 Jan 2007 14:51:48 GMT
Race Condition can result in hang on remoteBrokerNameKnownLatch
---------------------------------------------------------------

                 Key: AMQ-1120
                 URL: https://issues.apache.org/activemq/browse/AMQ-1120
             Project: ActiveMQ
          Issue Type: Bug
          Components: Transport
    Affects Versions: 4.0.2, 4.0.1, 4.0
         Environment: Windows XP, demand forwarding, failover == true
            Reporter: Chris Hofstaedter


My environment is comprised of Windows XP, AMQ v4.0.2, demand forwarding, failover = true,
client and broker are all within the same VM.  Typically, my client and broker would not be
within the same VM, but this issue was encountered while executing my junit tests - not in
a typical deployment environment.
 
Basically, DemandForwardingBridgeSupport.startLocalBridge() hangs on remoteBrokerNameKnownLatch.await();
 
It looks like the broker name becomes known prior to the call to await. I think the response
is coming in after the triggerLocalStartBridge thread is spawned and the synchronized block
in
DemandForwardingBridgeSupport.startRemoteBridge() is exited but before the await call in triggerLocalStartBridge.
 
 
Like I said, I've only run into this when running demand forwarding with client and broker
in the same VM along with a high volume of messages sent immediately after the connection
is established, which for me, is an artifact of junit testing.  
 
I have a relatively small number of clients that should connect fairly infrequently, so I
just put a bandaid of a 100ms wait into TcpTransportServer.run right before getAcceptListener().onAccept()
which allows my tests to complete successfully and has no appreciable impact on the performance
I care about but it's obviously not a valid fix for the race condition.

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