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https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14297894#comment-14297894
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Colin Patrick McCabe commented on HDFS-7648:
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bq. Do you meant, DirectoryScanner should identify the blocks which are not in
the expected directory path computed using its block ID and just do a log
message without fixing it
correct
bq. As per the earlier discussion it need to fix. I was having an idea which is
similar to the mechanism used in Datastorage, create hardlinks. Please correct
me if I miss anything.
It's not the goal of DirectoryScanner to fix anything. It should not modify
the filesystem.
> 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
>
> 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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