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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14289698#comment-14289698
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Rakesh R commented on HDFS-7648:
--------------------------------

[~szetszwo] I'm going through the "block ID-based block layout on datanodes" 
design and I come across this jira. I'm interested to implement this idea. I 
feel block report generation would be feasible one. Could you briefly explain 
about the verification points if you have anything specific in your mind. 
Thanks!

> 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
>
> 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 do the check.



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