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From "Patrick Kling (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-1476) listCorruptFileBlocks should be functional while the name node is still in safe mode
Date Wed, 17 Nov 2010 03:12:14 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932796#action_12932796
] 

Patrick Kling commented on HDFS-1476:
-------------------------------------

{code}
     [exec] -1 overall.  
     [exec] 
     [exec]     +1 @author.  The patch does not contain any @author tags.
     [exec] 
     [exec]     +1 tests included.  The patch appears to include 6 new or modified tests.
     [exec] 
     [exec]     +1 javadoc.  The javadoc tool did not generate any warning messages.
     [exec] 
     [exec]     +1 javac.  The applied patch does not increase the total number of javac compiler
warnings.
     [exec] 
     [exec]     -1 findbugs.  The patch appears to introduce 3 new Findbugs warnings.
     [exec] 
     [exec]     -1 release audit.  The applied patch generated 97 release audit warnings (more
than the trunk's current 1 warnings).
     [exec] 
     [exec]     +1 system test framework.  The patch passed system test framework compile.
{code}

The findbugs/release audit warnings are caused by the issue described in MAPREDUCE-2172.

> listCorruptFileBlocks should be functional while the name node is still in safe mode
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-1476
>                 URL: https://issues.apache.org/jira/browse/HDFS-1476
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Patrick Kling
>            Assignee: Patrick Kling
>         Attachments: HDFS-1476.2.patch, HDFS-1476.patch
>
>
> This would allow us to detect whether missing blocks can be fixed using Raid and if that
is the case exit safe mode earlier.
> One way to make listCorruptFileBlocks available before the name node has exited from
safe mode would be to perform a scan of the blocks map on each call to listCorruptFileBlocks
to determine if there are any blocks with no replicas. This scan could be parallelized by
dividing the space of block IDs into multiple intervals than can be scanned independently.

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