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https://issues.apache.org/jira/browse/HADOOP-3801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615394#action_12615394
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Doug Cutting commented on HADOOP-3801:
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Why can't different observer implementations share state? This change might
save a few lines of code, but at the price of breaking every implementation
when an interface changes. That doesn't seem like a great tradeoff.
> 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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