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From "Kevin Yaussy (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-961) Problem with subscription passing with network of brokers in AMQ 4.0.2
Date Fri, 06 Oct 2006 19:59:09 GMT
Problem with subscription passing with network of brokers in AMQ 4.0.2
----------------------------------------------------------------------

                 Key: AMQ-961
                 URL: https://issues.apache.org/activemq/browse/AMQ-961
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 4.0.2
            Reporter: Kevin Yaussy
            Priority: Critical


There's an occasional problem with subscription propagation when using a network of brokers.
 Test scenario uses ConsumerTool and PublisherTool in examples area of distribution.

1) Start broker A (has a network connection to broker B)
2) Start broker B (has a network connection to broker A)
3) start consumer C against broker A, on FOO
4) start publisher P against broker B, on FOO

Messages do not flow to consumer C.  In the broker B log, there's no indication it got any
subscriptions from broker A.  Again, this is occasional.

I've taken a kill-3 on the brokers, both when this condition appears, and when everything
is fine.  There's an obvious difference in one of the threads that hopefully will bring light
to the problem.  I've not gone into the code yet to try and find the issue, but figured I
would open this issue first.

Stack trace of broker A when subscriptions did NOT pass, and message flow is broken:
"ActiveMQ Transport: tcp://perfgc1a/170.137.15.169:5112" prio=10 tid=0x0030e160 nid=0x3f in
Object.wait() [0x8
e2ff000..0x8e2ff8f0]
        at java.lang.Object.wait(Native Method)
        - waiting on <0x9b2b00d0> (a edu.emory.mathcs.backport.java.util.concurrent.CountDownLatch)
        at java.lang.Object.wait(Object.java:474)
        at edu.emory.mathcs.backport.java.util.concurrent.CountDownLatch.await(CountDownLatch.java:179)
        - locked <0x9b2b00d0> (a edu.emory.mathcs.backport.java.util.concurrent.CountDownLatch)
        at org.apache.activemq.network.DemandForwardingBridgeSupport.waitStarted(DemandForwardingBridgeSupport
.java:830)
        at org.apache.activemq.network.DemandForwardingBridgeSupport.serviceRemoteCommand(DemandForwardingBrid
geSupport.java:329)
        at org.apache.activemq.network.DemandForwardingBridgeSupport$2.onCommand(DemandForwardingBridgeSupport
.java:130)
        at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:92)
        at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:67)
        at org.apache.activemq.transport.failover.FailoverTransport$1.onCommand(FailoverTransport.java:117)
        at org.apache.activemq.transport.WireFormatNegotiator.onCommand(WireFormatNegotiator.java:124)
        at org.apache.activemq.transport.InactivityMonitor.onCommand(InactivityMonitor.java:123)
        at org.apache.activemq.transport.TransportSupport.doConsume(TransportSupport.java:88)
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:137)
        at java.lang.Thread.run(Thread.java:595)


Stack trace of broker A when everything works correctly:

"ActiveMQ Transport: tcp://perfgc1a/170.137.15.169:5112" prio=10 tid=0x01955fc8 nid=0x3f runnable
[0x8e2cf000..0x8e2cfaf0]
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(SocketInputStream.java:129)
        at org.apache.activemq.transport.tcp.TcpBufferedInputStream.fill(TcpBufferedInputStream.java:49)
        at org.apache.activemq.transport.tcp.TcpBufferedInputStream.read(TcpBufferedInputStream.java:56)
        at java.io.DataInputStream.readInt(DataInputStream.java:353)
        at org.apache.activemq.openwire.OpenWireFormat.unmarshal(OpenWireFormat.java:275)
        at org.apache.activemq.transport.tcp.TcpTransport.run(TcpTransport.java:136)
        at java.lang.Thread.run(Thread.java:595)



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