Daniel Templeton created YARN-4457:

             Summary: Cleanup unchecked types for EventHandler
                 Key: YARN-4457
                 URL: https://issues.apache.org/jira/browse/YARN-4457
             Project: Hadoop YARN
          Issue Type: Improvement
    Affects Versions: 2.7.1
            Reporter: Daniel Templeton
            Assignee: Daniel Templeton

The EventHandler class is often used in an untyped context resulting in a bunch 
of warnings about unchecked usage.  The culprit is the 
{{Dispatcher.getHandler()}} method.  Fixing the typing on the method to return 
{{EventHandler<Event>}} instead of {{EventHandler}} clears up the errors and 
doesn't not introduce any incompatible changes.  In the case that some code 

EventHandler h = dispatcher.getHandler();

it will still work and will issue a compiler warning about raw types.  There 
are, however, no instances of this issue in the current source base.

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