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https://issues.apache.org/jira/browse/HADOOP-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646538#action_12646538
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Sharad Agarwal commented on HADOOP-4605:
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>> you aren't going to be able to run them against a different hadoop release 
>> than in the classpath.
picking the right binaries by overriding some ant parameter shouldn't be much 
hard, no?

>> This will be faster anyway, it just complicates the test setup process
Yes, it will complicate a lot and automating the runs won't be trivial then.

> 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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