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From "Aaron T. Myers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3521) Allow namenode to tolerate edit log corruption
Date Thu, 14 Jun 2012 18:24:43 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13295210#comment-13295210
] 

Aaron T. Myers commented on HDFS-3521:
--------------------------------------

Hey Nicholas, I'm still not entirely convinced of the motivation for this change, and I agree
with Colin that we should be careful with respect to what impact this change will have on
recovery mode. Given that, I do think we should revert this commit until everyone's satisfied
with the changes it makes.

I'm sure we can figure out a mutually-agreeable way to address the concerns you have, but
let's talk it out for a bit first?
                
> 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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