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From "alan wootton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-227) Namespace check pointing is not performed until the namenode restarts.
Date Fri, 26 May 2006 01:47:30 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-227?page=comments#action_12413332 ] 

alan wootton commented on HADOOP-227:
-------------------------------------

Does anyone have a clever idea of how to take a snapshot of a running, very active, and very
large, NameNode? Without things timing out like crazy? We're ok with the idea of just stopping
everything once in a while and restarting the namenode. Still.... 

> Namespace check pointing is not performed until the namenode restarts.
> ----------------------------------------------------------------------
>
>          Key: HADOOP-227
>          URL: http://issues.apache.org/jira/browse/HADOOP-227
>      Project: Hadoop
>         Type: Bug

>   Components: dfs
>     Reporter: 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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