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https://issues.apache.org/jira/browse/HADOOP-9517?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13647683#comment-13647683
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Steve Loughran commented on HADOOP-9517:
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The closest thing we do have to strict specifications are the tests, perhaps 
that could be used to declare stability

"stable with respect to the current test suite"

That makes clear that changing the test suite is a way of changing the 
specification: more tests = tighter spec. But for all those bits that aren't 
tightly specified, that's all we can say "works-for-our-tests"
                
> Define Hadoop Compatibility
> ---------------------------
>
>                 Key: HADOOP-9517
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9517
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: documentation
>            Reporter: Arun C Murthy
>            Assignee: Karthik Kambatla
>         Attachments: hadoop-9517.patch
>
>
> As we get ready to call hadoop-2 stable we need to better define 'Hadoop 
> Compatibility'.
> http://wiki.apache.org/hadoop/Compatibility is a start, let's document 
> requirements clearly and completely.

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