NullMessageStore not safe for concurrent DTX operations
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                 Key: QPID-3201
                 URL: https://issues.apache.org/jira/browse/QPID-3201
             Project: Qpid
          Issue Type: Bug
    Affects Versions: 0.8, 0.10
            Reporter: Gordon Sim
            Assignee: Gordon Sim
             Fix For: 0.11


...as the 'prepared' set is not protected from concurrent access by any 
locking. E.g. running qpid-txtest with --dtx true and several queues in a 
stress test against a broker with no store plugin will crash the broker.

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