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Posted to dev@activemq.apache.org by "Hiram Chirino (JIRA)" <ji...@apache.org> on 2009/02/13 17:58:59 UTC
[jira] Resolved: (AMQ-2107) activemq-flow's Fixes and Refactoring
in org.apache.activemq.dispatchPackage
[ https://issues.apache.org/activemq/browse/AMQ-2107?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hiram Chirino resolved AMQ-2107.
--------------------------------
Resolution: Fixed
applied.. Thx!
> 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
>
> Attachments: patch.txt
>
>
> 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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