Change the job state observer classes to interfaces
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Key: HADOOP-3801
URL: https://issues.apache.org/jira/browse/HADOOP-3801
Project: Hadoop Core
Issue Type: Improvement
Reporter: Owen O'Malley
Assignee: Vivek Ratan
Schedulers will most often want to be the observers of the job state events in
a single class. Therefore, I think they should be interfaces which can have
multiple inheritance.
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