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https://issues.apache.org/jira/browse/HDFS-2974?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Aaron T. Myers updated HDFS-2974:
---------------------------------

    Attachment: HDFS-2952-HDFS-1623.patch

Here's a patch which addresses the issue.

This was discovered because of the commit of HDFS-2952. I didn't notice this 
problem because when I ran the HA tests, it just so happened that 
TestDFSUpgradeWithHA was run last, and thus it did not interfere with any other 
test. To test this patch, I ran the following, which results in 
TestDFSUpgradeWithHA running before the other test:

{code}
mvn -Dtest=TestDFSUpgradeWithHA,TestDNFencingWithReplication test
{code}


Without this patch, TestDNFencingWithReplication should fail.
                
> HA: MiniDFSCluster does not delete standby NN name dirs during format
> ---------------------------------------------------------------------
>
>                 Key: HDFS-2974
>                 URL: https://issues.apache.org/jira/browse/HDFS-2974
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, test
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Aaron T. Myers
>            Assignee: Aaron T. Myers
>         Attachments: HDFS-2952-HDFS-1623.patch
>
>
> When the MiniDFSCluster is formtting an HA cluster, it formats the first NN, 
> and then copies the contents of that directory to the second NNs name dirs. 
> However, the second NNs name dirs are not emptied first, and thus a previous 
> test's state may interfere with the test.

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