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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14334273#comment-14334273
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Colin Patrick McCabe commented on HDFS-7648:
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bq. Mmm ... We are not fixing the software bug but fixing the blocks/data.
Also, there is a conf. So it is manually but not automatically.
If you don't fix the bug, isn't this just going to re-occur? You cannot fix a
problem if you don't know what it is. And the software doesn't know why files
would be in the wrong position. Similarly, the software doesn't know why
VERSION might be missing, or a meta file might not be there, or a volume might
not be accessible.
> 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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