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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7648) Verify the datanode directory layout
Date Thu, 12 Feb 2015 03:41:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14317523#comment-14317523
] 

Colin Patrick McCabe commented on HDFS-7648:
--------------------------------------------

Thank you for sticking with this.

bq. Attach new patch where it will print the log message and clear the list, if the mismatchFiles
reaches 100. Please review. Thanks!

Why don't you just log them as you go?  I really see no reason for a list and it adds complexity.

Also, please give different patch files different names, to avoid confusion.

thanks.

> 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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