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https://issues.apache.org/jira/browse/HADOOP-6733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12879623#action_12879623
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Konstantin Boudnik commented on HADOOP-6733:
--------------------------------------------

This seems to be a very reasonable and sorta cheap approach of testing backward 
compatibility. The only thing needs to be kept in mind that set of test 
applications needs to be consistent from release to release. Otherwise, such 
verification won't be representative enough. But I guess word count doesn't go 
nowhere :)

> Create a test for FileSystem API compatibility between releases
> ---------------------------------------------------------------
>
>                 Key: HADOOP-6733
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6733
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>            Reporter: Tom White
>            Priority: Blocker
>             Fix For: 0.21.0
>
>
> We should have an automated test for checking that programs written against 
> an old version of the FileSystem API still run with a newer version. 

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