[jboss-jira] [JBoss JIRA] Created: (JBAS-6529) Investigate having DistributedReplicantManager send all notifications via async thread

[Brian Stansberry (JIRA)]

Investigate having DistributedReplicantManager send all notifications via async thread
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                 Key: JBAS-6529
                 URL: https://jira.jboss.org/jira/browse/JBAS-6529
             Project: JBoss Application Server
          Issue Type: Task
      Security Level: Public (Everyone can see)
          Components: Clustering
            Reporter: Brian Stansberry
            Assignee: Brian Stansberry
             Fix For: JBossAS-6.0.0.Alpha1
         Attachments: threadDump-1.html

DRM currently dispatches remotely originated notifications to registered ReplicantListeners via its AsynchKeyChangeHandler thread. Notifications originating from local changes to the DRM are dispatched via the calling thread. This can lead to deadlocks a la the attached thread dump.

Task is to investigate having the locally originating notifications dispatched via the async thread.

This can be a pretty significant change, as I believe there's a fair bit of code that 1) registers as a DRM listener 2) invokes on the DRM 3) expects a callback from the DRM 4) continues on.  Having #3 occur on a different thread could break things.  And having the original thread somehow block after #2 until the desired callback comes in would defeat the purpose.

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