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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-227) Namespace check pointing is not performed until the namenode restarts.
Date Fri, 15 Dec 2006 19:06:24 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-227?page=comments#action_12458886 ] 
            
dhruba borthakur commented on HADOOP-227:
-----------------------------------------

An addition to the above proposal. There will be an additional parameter named dfs.namenode.secondary.configfile
that contains the absolute pathname of the "masters" file.

The namenode will allow SecondaryNamenodeProcotol connections only from nodes listed in the
"masters' file. Also, the webUI can query the namenode to list the identities of the Secondary
Namenodes.

> 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: dhruba borthakur
>         Attachments: patch-async-checkpoints-0.9.0, patch-async-checkpoints-0.9.0, patch-async-checkpoints-0.9.0
>
>
> 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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