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https://issues.apache.org/jira/browse/HDFS-1881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13033308#comment-13033308
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Suresh Srinivas commented on HDFS-1881:
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Patch looks good. Thanks for catching the bug. One minor comment:
In tests use MiniDFSCluster#getFinalizedDir() instead of building it using 
various path fragments. There are example in other tests.


> After taking snapshot (upgrade) on Federation,  the current directory of data 
> node is emtpy.
> --------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1881
>                 URL: https://issues.apache.org/jira/browse/HDFS-1881
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Tanping Wang
>            Assignee: Tanping Wang
>         Attachments: HDFS-1881.patch
>
>
> After taking a snapshot in Federation (by starting up namenode with option 
> -upgrade), it appears that the current directory of data node does not 
> contain the block files.  We have also verified that upgrading from 20 to 
> Federation does not have this problem.

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