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https://issues.apache.org/jira/browse/HDFS-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096261#comment-13096261
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Suresh Srinivas commented on HDFS-988:
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I committed the patch to 0.20-security branch.
> saveNamespace race can corrupt the 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: Eli Collins
> Priority: Blocker
> Fix For: 0.20-append, 0.20.205.0, 0.22.0
>
> Attachments: 988-fixups.txt, HDFS-988.20-security.patch,
> HDFS-988_fix_synchs.patch, hdfs-988-2.patch, hdfs-988-3.patch,
> hdfs-988-4.patch, hdfs-988-5.patch, hdfs-988-6.patch, hdfs-988-7.patch,
> hdfs-988-b22-1.patch, 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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