Daniel Templeton updated YARN-4457:
    Attachment: YARN-4457.001.patch

> 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
>         Attachments: YARN-4457.001.patch
> 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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