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From "Colin MacNaughton (JIRA)" <j...@apache.org>
Subject [jira] Created: (AMQ-2107) activemq-flow's Fixes and Refactoring in org.apache.activemq.dispatchPackage
Date Thu, 12 Feb 2009 21:36:59 GMT
activemq-flow's Fixes and Refactoring in org.apache.activemq.dispatchPackage
----------------------------------------------------------------------------

                 Key: AMQ-2107
                 URL: https://issues.apache.org/activemq/browse/AMQ-2107
             Project: ActiveMQ
          Issue Type: Bug
    Affects Versions: incubation
         Environment: N/A
            Reporter: Colin MacNaughton
             Fix For: incubation


There is deadlock in PriorityDispatcher.run when processing updates from foreign threads,
it holds on to foreignQueue. If there are multiple dispatch threads this can lead to the following
deadlock:

Thread [BrokerDispatcher-1] (Suspended)  
  owns: LinkedNodeList<T>  (id=102)  
  waiting for: LinkedNodeList<T>  (id=125)  
  PriorityDispatcher$PriorityDispatchContext.onForeignThreadUpdate() line: 132  
  ExecutionGraphLoadBalancer$ExecutionGraphNode.processForeignUpdates() line: 428  
  PriorityDispatcher$UpdateEvent.execute() line: 79  
  PriorityDispatcher.run() line: 279  
  Thread.run() line: 613  
Thread [BrokerDispatcher-2] (Suspended)  
  owns: LinkedNodeList<T>  (id=125)  
  waiting for: LinkedNodeList<T>  (id=102)  
  PriorityDispatcher$PriorityDispatchContext.onForeignThreadUpdate() line: 132  
  ExecutionGraphLoadBalancer$ExecutionGraphNode.processForeignUpdates() line: 428  
  PriorityDispatcher$UpdateEvent.execute() line: 79  
  PriorityDispatcher.run() line: 279  
  Thread.run() line: 613

The attached patch also includes refactoring of the PriorityPooledDispatcher to use a simplifed
ExecutionLoadBalancer interface.

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