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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14327066#comment-14327066
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Tsz Wo Nicholas Sze commented on HDFS-7648:
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> ... Has this ever actually happened? And if it did happen, isn't the answer
> more likely to be "stop editing the VERSION file manually, silly" or "your
> ext4 filesystem is bad and needs to be completely reformatted" rather than
> "DN should cleverly fix"?
If we wait until it happened, how could we help the users? The may also be
other reasons such as there is a bug in the software, the admin manually moved
the block files around, etc.
> 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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