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From "Jitendra Nath Pandey (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-988) saveNamespace race can corrupt the edits log
Date Mon, 22 Aug 2011 20:38:29 GMT

     [ https://issues.apache.org/jira/browse/HDFS-988?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jitendra Nath Pandey updated HDFS-988:
--------------------------------------

    Attachment: HDFS-988.20-security.patch

Uploaded patch for 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, 0.22.0
>
>         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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