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https://issues.apache.org/jira/browse/HADOOP-3801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12617172#action_12617172
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Steve Loughran commented on HADOOP-3801:
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As someone who would add a listener to his todo list, can I state that it
doesn't make that much difference to me. If it was an abstract class, I'd have
to create a non-static inner class to handle the events; if it was an
interface, I may still end up doing the same thing, though there it would be
more optional.
> Change the job state observer classes to interfaces
> ---------------------------------------------------
>
> 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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