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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14319033#comment-14319033
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Colin Patrick McCabe commented on HDFS-7648:
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bq. should the block report include those blocks
yes. I do not think we should take any special effort to exclude these blocks.
bq. How to access those blocks
They can't be accessed, because they are in the wrong position
bq. How and when to fix those blocks?
They should be fixed by the sysadmin, based on what the actual problem is
(which the software doesn't know).
> 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.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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