[jira] [Created] (YARN-4457) Cleanup unchecked types for EventHandler

["Daniel Templeton (JIRA)" <ji...@apache.org>]

Daniel Templeton created YARN-4457:
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             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 does:

{code}
EventHandler h = dispatcher.getHandler();
{code}

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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