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https://issues.apache.org/jira/browse/HADOOP-4605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12645608#action_12645608
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Tsz Wo (Nicholas), SZE commented on HADOOP-4605:
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How about the incompatible changes? The old unit tests are supposed to fail.
> 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
> Reporter: Doug Cutting
>
> We should test back-compatibility by running unit tests from a prior release.
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