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Date: Thu, 27 Sep 2012 18:42:10 +1100 (NCT)
From: "Colin Patrick McCabe (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-3540) Further improvement on recovery mode
 and edit log toleration in branch-1
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    [ https://issues.apache.org/jira/browse/HDFS-3540?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13464529#comment-13464529 ] 

Colin Patrick McCabe commented on HDFS-3540:
--------------------------------------------

The approach seems reasonable.  However, some changes may be necessary to get the unit tests running, especially TestNameNodeRecovery, which does not alter the default value for edit log toleration, and will not work if there are prompts during the startup process.
                
> 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, 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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