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https://issues.apache.org/jira/browse/HADOOP-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646966#action_12646966
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Doug Cutting commented on HADOOP-4605:
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> What you do need to look out for there is refactoring a class and 
> accidentally having the changes propagate into the API tests.

No, I'm proposing that we can aggressively update tests as we update APIs, 
since we we'll use the older, unchanged versions of the tests (from a 
subversion tag) to check back-compatibility.  We'd run two versions of the 
tests: the current and the oldest that we claim compatibility with.


> should run old version of unit tests to check back-compatibility
> ----------------------------------------------------------------
>
>                 Key: HADOOP-4605
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4605
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: test
>            Reporter: Doug Cutting
>
> We should test back-compatibility by running unit tests from a prior release.

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