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From "eric baldeschwieler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-227) Namespace check pointing is not performed until the namenode restarts.
Date Tue, 05 Dec 2006 07:24:25 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-227?page=comments#action_12455530 ] 
            
eric baldeschwieler commented on HADOOP-227:
--------------------------------------------

Sounds a lot like a BTree and comes with all of the issues.  Lots of IO and complexity.  Reimplementing
that seems like a bad idea.  perhaps you can find a good java BTree, but this seems like a
big, heavy piece of code.

Why do we  need to do this?

> 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: Milind Bhandarkar
>
> 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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