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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15195908#comment-15195908
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Colin Patrick McCabe commented on HDFS-7648:
--------------------------------------------

Hi [~rakesh_r], can you rebase the patch on trunk?

{code}
              LOG.warn("Block: " + blockId
                          + " has to be upgraded to block ID-based layout");
{code}
Perhaps "Block XYZ is in the wrong directory" would be clearer?

+1 once these are addressed.

> Verify the datanode directory layout
> ------------------------------------
>
>                 Key: HDFS-7648
>                 URL: https://issues.apache.org/jira/browse/HDFS-7648
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Rakesh R
>         Attachments: HDFS-7648-3.patch, HDFS-7648-4.patch, HDFS-7648-5.patch, 
> HDFS-7648.patch, HDFS-7648.patch
>
>
> HDFS-6482 changed datanode layout to use block ID to determine the directory 
> to store the block.  We should have some mechanism to verify it.  Either 
> DirectoryScanner or block report generation could do the check.



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