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From "Gary Tully (JIRA)" <>
Subject [jira] [Created] (AMQ-4705) Add keep alive support to shared file locker
Date Fri, 30 Aug 2013 14:19:51 GMT
Gary Tully created AMQ-4705:

             Summary: Add keep alive support to shared file locker
                 Key: AMQ-4705
             Project: ActiveMQ
          Issue Type: Bug
          Components: Message Store
    Affects Versions: 5.8.0
            Reporter: Gary Tully
            Assignee: Gary Tully
             Fix For: 5.9.0

issue on nsfv4 with a master slave configuration, where both the slave and the master could
obtain a lock.
The following events occurred:

* master locks the file - does no more i/o to it – it's passive wrt the lock
* slave asks every 10 seconds if it can get the lock nfs come back and say no, someone has
* nfs dies not nicely
 ** nfsv4 is stateful - no callback for locks. It has a grace period 30 seconds to let all
clients had locks reclaims locked
* master does not realize it needs to reclaim the lock and continues under the assumption
it has the lock.
* After 30 sec grace period, slave comes in and asks for the lock and it receives it.

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