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From "Christian Kunz (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-227) Namespace check pointing is not performed until the namenode restarts.
Date Wed, 25 Oct 2006 19:15:17 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-227?page=comments#action_12444717 ] 
            
Christian Kunz commented on HADOOP-227:
---------------------------------------

It looks as if this is on a back burner. I would like to raise the issue again, because the
edits file can become large very quickly depending on the frequency of file operations. I
generate an edits file of more than 2.5Gb every 24 hours. Of course, the namenode server could
be restarted periodically (this what I have to do right now), but this is rather interruptive
to clients. What about rotating the edits file periodically and resolving the older edits
file with the image file in a separate thread? 

> Namespace check pointing is not performed until the namenode restarts.
> ----------------------------------------------------------------------
>
>                 Key: HADOOP-227
>                 URL: http://issues.apache.org/jira/browse/HADOOP-227
>             Project: Hadoop
>          Issue Type: Bug
>          Components: dfs
>    Affects Versions: 0.2.0
>            Reporter: Konstantin Shvachko
>         Assigned To: Konstantin Shvachko
>
> In current implementation when the name node starts, it reads its image file, then
> the edits file, and then saves the updated image back into the image file.
> The image file is never updated after that.
> In order to provide the system reliability reliability the namespace information should
> be check pointed periodically, and the edits file should be kept relatively small.

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