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https://issues.apache.org/jira/browse/HDFS-3540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13443375#comment-13443375
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Colin Patrick McCabe commented on HDFS-3540:
--------------------------------------------

Hi Nicholas,

Your summary seems reasonable to me overall.  I agree with you that the 
recommended setting for edit log toleration should be disabled.  Is there 
anything left to do for this JIRA?
                
> 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
>
> *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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