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https://issues.apache.org/jira/browse/HDFS-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13048301#comment-13048301
]
Hudson commented on HDFS-988:
-----------------------------
Integrated in Hadoop-Hdfs-22-branch #66 (See
[https://builds.apache.org/job/Hadoop-Hdfs-22-branch/66/])
HDFS-988. saveNamespace race can corrupt the edits log. Contributed by Eli
Collins
eli : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1134860
Files :
*
/hadoop/hdfs/branches/branch-0.22/src/java/org/apache/hadoop/hdfs/server/namenode/FSDirectory.java
*
/hadoop/hdfs/branches/branch-0.22/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestSafeMode.java
*
/hadoop/hdfs/branches/branch-0.22/src/java/org/apache/hadoop/hdfs/server/namenode/FSNamesystem.java
*
/hadoop/hdfs/branches/branch-0.22/src/test/hdfs/org/apache/hadoop/hdfs/TestSafeMode.java
* /hadoop/hdfs/branches/branch-0.22/CHANGES.txt
*
/hadoop/hdfs/branches/branch-0.22/src/test/hdfs/org/apache/hadoop/hdfs/DFSTestUtil.java
> 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_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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