[jira] [Created] (MAPREDUCE-3536) consider whether the same instance of a ServiceStateChangeListener should be allowed to listen to events

["Steve Loughran (Created) (JIRA)" <ji...@apache.org>]

consider whether the same instance of a ServiceStateChangeListener should be allowed to listen to events
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                 Key: MAPREDUCE-3536
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3536
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
    Affects Versions: 0.23.0, 0.24.0
            Reporter: Steve Loughran
            Priority: Trivial


Currently there is no limit on the number of times a listener can register for events; it's a simple list. A service must unregister the same number of times that it registers.

Is this the desired behaviour? If so it should be documented in the {{Service}} interface rather than just implicitly in the {{AbstractService}} implementation. 

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