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Posted to common-dev@hadoop.apache.org by "alan wootton (JIRA)" <ji...@apache.org> on 2006/05/26 03:47:30 UTC
[jira] Commented: (HADOOP-227) Namespace check pointing is not
performed until the namenode restarts.
[ 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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