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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