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https://issues.apache.org/jira/browse/HADOOP-13502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15545288#comment-15545288
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Chris Nauroth commented on HADOOP-13502:
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I'm aware of closed-source implementations that may be using the HCFS tests.

Really this comes down to compatibility policy for the HCFS tests.  I don't 
think we've discussed that in the past, and there are currently no 
audience/stability annotations.  If we are committed to backward compatibility, 
then we're better off with the approach I took in patch 001.  If we are not 
committed to backward compatibility for the HCFS tests, then we're free to 
change anything we want and repurpose is-blobstore as a purely descriptive 
flag.  I have a slight preference for maintaining backward compatibility, but 
would welcome other opinions.

> Rename/split fs.contract.is-blobstore flag used by contract tests.
> ------------------------------------------------------------------
>
>                 Key: HADOOP-13502
>                 URL: https://issues.apache.org/jira/browse/HADOOP-13502
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: test
>            Reporter: Chris Nauroth
>            Assignee: Chris Nauroth
>            Priority: Minor
>         Attachments: HADOOP-13502-branch-2.001.patch
>
>
> The {{fs.contract.is-blobstore}} flag guards against execution of several 
> contract tests to account for known limitations with blob stores.  However, 
> the name is not entirely accurate, because it's still possible that a file 
> system implemented against a blob store could pass those tests, depending on 
> whether or not the implementation matches the semantics of HDFS.  This issue 
> proposes to rename the flag or split it into different flags with different 
> definitions for the semantics covered by the current flag.



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