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Posted to hdfs-issues@hadoop.apache.org by "Suresh Srinivas (JIRA)" <ji...@apache.org> on 2011/09/02 22:03:14 UTC
[jira] [Commented] (HDFS-988) saveNamespace race can corrupt the
edits log
[ https://issues.apache.org/jira/browse/HDFS-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13096254#comment-13096254 ]
Suresh Srinivas commented on HDFS-988:
--------------------------------------
+1 for the 20-security patch.
> 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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