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Posted to common-dev@hadoop.apache.org by "Doug Cutting (JIRA)" <ji...@apache.org> on 2008/07/21 22:03:31 UTC
[jira] Commented: (HADOOP-3801) Change the job state observer
classes to interfaces
[ https://issues.apache.org/jira/browse/HADOOP-3801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12615394#action_12615394 ]
Doug Cutting commented on HADOOP-3801:
--------------------------------------
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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