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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14289727#comment-14289727
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Tsz Wo Nicholas Sze commented on HDFS-7648:
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During block report generation or directory scanning, it traverses the
directory for collecting all the replica information. We should verify whether
the actual directory location of a replica has the expected directory path
computed using its block ID. If a mismatch is found, it should also fix it.
On a second thought, DirectoryScanner seems a better place to do the
verification since the purpose of the DirectoryScanner is to verify and fix the
blocks stored in the local directories. What do you think?
> 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 could do the check.
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