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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3540) Further improvement on recovery mode and edit log toleration in branch-1
Date Thu, 18 Oct 2012 02:16:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13478603#comment-13478603
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3540:
----------------------------------------------

{noformat}
     [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 9 new Findbugs (version 1.3.9)
warnings.
{noformat}

I also have run the unit tests.
                
> Further improvement on recovery mode and edit log toleration in branch-1
> ------------------------------------------------------------------------
>
>                 Key: HDFS-3540
>                 URL: https://issues.apache.org/jira/browse/HDFS-3540
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 1.2.0
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>         Attachments: h3540_20120925.patch, h3540_20120926.patch, h3540_20120927.patch,
h3540_20121009.patch, HDFS-3540-b1.004.patch
>
>
> *Recovery Mode*: HDFS-3479 backported HDFS-3335 to branch-1.  However, the recovery mode
feature in branch-1 is dramatically different from the recovery mode in trunk since the edit
log implementations in these two branch are different.  For example, there is UNCHECKED_REGION_LENGTH
in branch-1 but not in trunk.
> *Edit Log Toleration*: HDFS-3521 added this feature to branch-1 to remedy UNCHECKED_REGION_LENGTH
and to tolerate edit log corruption.
> There are overlaps between these two features.  We study potential further improvement
in this issue.

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