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From "Arthur Naseef (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3277) Deadlock with static:(failover:(...)) configuration
Date Fri, 08 Apr 2011 21:05:05 GMT
Deadlock with static:(failover:(...)) configuration
---------------------------------------------------

                 Key: AMQ-3277
                 URL: https://issues.apache.org/jira/browse/AMQ-3277
             Project: ActiveMQ
          Issue Type: Bug
          Components: Broker
    Affects Versions: 5.4.2
         Environment: 5.4.2 with back-ported patches for AMQ-3176, AMQ-2736, AMQ-3124, AMQ-3125,
AMQ-3167.

Two brokers, each with a single duplex network connection to the other, using static:(failover:(first,second))
URI format.
            Reporter: Arthur Naseef


Using failover transports with static transports to create a network of brokers with H/A pairs,
the failovers lead to deadlocks.

This appears related to AMQ-3176, but the patch for that problem is included in our 5.4.2
build.

                <networkConnector name="nw1_from_nw2" uri="static:(failover:(tcp://127.0.0.1:60992,tcp://127.0.0.1:60002))"
                                  duplex="true" conduitSubscriptions="false" dynamicOnly="true"
                                  networkTTL="7" suppressDuplicateQueueSubscriptions="true"
                                  decreaseNetworkConsumerPriority="true"

                                  bridgeTempDestinations="true"
                                  >
                </networkConnector>

The deadlock occurs after stopping and restarting each broker once.  Here's the steps:

    - start broker1
    - start broker2
    * test connectivity
    - sthudown broker1
    - restart broker1
    * test connectivity
    - shutdown broker2
    - restart broker2
    * test connectivity

Here is the deadlock information from the JVM:

Java stack information for the threads listed above:
===================================================
"StartRemotelBridge: localBroker=vm://peer-nw2#2":
        at org.apache.activemq.transport.failover.FailoverTransport.oneway(FailoverTransport.java:477)
        - waiting to lock <0x00002aaac2df83c8> (a java.lang.Object)
        at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:40)
        - locked <0x00002aaac2e050f8> (a java.lang.Object)
        at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60)
        at org.apache.activemq.network.DemandForwardingBridgeSupport.startRemoteBridge(DemandForwardingBridgeSupport.java:352)
        - locked <0x00002aaac2df7c50> (a org.apache.activemq.network.DurableConduitBridge)
        at org.apache.activemq.network.DemandForwardingBridgeSupport$4.run(DemandForwardingBridgeSupport.java:277)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
"ActiveMQ Failover Worker: 169776139":
        at org.apache.activemq.network.DemandForwardingBridgeSupport.startLocalBridge(DemandForwardingBridgeSupport.java:290)
        - waiting to lock <0x00002aaac2df7c50> (a org.apache.activemq.networFound one
Java-level deadlock:
=============================
"StartRemotelBridge: localBroker=vm://peer-nw2#2":
  waiting to lock monitor 0x0000000044796938 (object 0x00002aaac2df83c8, a java.lang.Object),
  which is held by "ActiveMQ Failover Worker: 169776139"
"ActiveMQ Failover Worker: 169776139":
  waiting to lock monitor 0x00002aaac470f0b0 (object 0x00002aaac2df7c50, a org.apache.activemq.network.DurableConduitBridge),
  which is held by k.DurableConduitBridge)
        at org.apache.activemq.network.DemandForwardingBridgeSupport$2.transportResumed(DemandForwardingBridgeSupport.java:220)
        at org.apache.activemq.transport.TransportFilter.transportResumed(TransportFilter.java:109)
        at org.apache.activemq.transport.TransportFilter.transportResumed(TransportFilter.java:109)
        at org.apache.activemq.transport.failover.FailoverTransport.doReconnect(FailoverTransport.java:870)
        - locked <0x00002aaac2df83c8> (a java.lang.Object)
        at org.apache.activemq.transport.failover.FailoverTransport$2.iterate(FailoverTransport.java:135)
        - locked <0x00002aaac2df83d8> (a java.lang.Object)
        at org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:98)
        at org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:36)

Found 1 deadlock.


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