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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3521) Allow namenode to tolerate edit log corruption
Date Thu, 14 Jun 2012 19:37:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295258#comment-13295258
] 

Tsz Wo (Nicholas), SZE commented on HDFS-3521:
----------------------------------------------

Hi Aaron,

Recovery mode in branch-1 just let you stop reading or quit without saving.  It does not really
"recover" anything.  IMO, it does not seem useful.  How about we revert it?

Again, the edit log toleration can be disabled.  I think there is no reason to revert the
patch.

If you see that other improvements could be made regarding to recovery mode or edit log toleration,
we could discuss them in another JIRA.
                
> Allow namenode to tolerate edit log corruption
> ----------------------------------------------
>
>                 Key: HDFS-3521
>                 URL: https://issues.apache.org/jira/browse/HDFS-3521
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 1.2.0
>
>         Attachments: h3521_20120610_b-1.patch, h3521_20120611_b-1.0.patch, h3521_20120611_b-1.patch
>
>
> HDFS-3479 adds checking for edit log corruption. It uses a fixed UNCHECKED_REGION_LENGTH
(=PREALLOCATION_LENGTH) so that the bytes at the end within the length is not checked.  Instead
of not checking the bytes, we should check everything and allow toleration.

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