[jira] Updated: (HDFS-988) saveNamespace can corrupt edits log

["Nicolas Spiegelberg (JIRA)" <ji...@apache.org>]

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

Nicolas Spiegelberg updated HDFS-988:
-------------------------------------

    Affects Version/s: 0.20-append

This should be pulled into the branch-0.20-append branch.  Besides stability fix, causes append tests to fail.

> 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: 0.21.0, 0.22.0, 0.20-append
>            Reporter: dhruba borthakur
>            Assignee: Todd Lipcon
>            Priority: Blocker
>         Attachments: hdfs-988.txt, saveNamespace.txt
>
>
> 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

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.