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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-988) saveNamespace can corrupt edits log
Date Thu, 01 Jul 2010 18:59:53 GMT

    [ https://issues.apache.org/jira/browse/HDFS-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12884380#action_12884380
] 

Brahma Reddy Battula commented on HDFS-988:
-------------------------------------------

hi dhruba borthakur ,

I am using the 20.1 version..
I put NameNode in safemode and then i executed the save namespace,,But editlogs are not corrupted..
can u please give exact scenario to reproduce this.

> saveNamespace can corrupt edits log
> -----------------------------------
>
>                 Key: HDFS-988
>                 URL: https://issues.apache.org/jira/browse/HDFS-988
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: name-node
>    Affects Versions: 0.20-append, 0.21.0, 0.22.0
>            Reporter: dhruba borthakur
>            Assignee: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.20-append
>
>         Attachments: hdfs-988.txt, saveNamespace.txt, saveNamespace_20-append.patch
>
>
> The adminstrator puts the namenode is safemode and then issues the savenamespace command.
This can corrupt the edits log. The problem is that  when the NN enters safemode, there could
still be pending logSycs occuring from other threads. Now, the saveNamespace command, when
executed, would save a edits log with partial writes. I have seen this happen on 0.20.
> https://issues.apache.org/jira/browse/HDFS-909?focusedCommentId=12828853&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12828853

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