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Date: Thu, 12 Feb 2015 21:42:12 +0000 (UTC)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12768846.1421802434000.31760.1423777332442@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-7648) Verify the datanode directory layout
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    [ https://issues.apache.org/jira/browse/HDFS-7648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14319033#comment-14319033 ] 

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

bq. should the block report include those blocks

yes.  I do not think we should take any special effort to exclude these blocks.

bq. How to access those blocks

They can't be accessed, because they are in the wrong position

bq. How and when to fix those blocks?

They should be fixed by the sysadmin, based on what the actual problem is (which the software doesn't know).

> 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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