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From "Bryan Pendleton (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-56) hadoop nameserver does not recognise ndfs nameserver image
Date Fri, 24 Feb 2006 19:09:39 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-56?page=comments#action_12367698 ] 

Bryan Pendleton commented on HADOOP-56:
---------------------------------------

I'd perhaps request one more feature: tag each block somehow with a GUID related to the DFS
filesystem it is associated with.  So, if we're adding a filesystem "format" can assign the
GUID to the newly-created image. And a datanode can find out what the GUID is of the nameserver
it's working with before it enumerates blocks, merely ignoring any blocks that have the wrong
GUID.

This solves the problem of multiple folks writing with different DFS installs to the same
drive, as well as the misconfigured namenode problem, above.

> hadoop nameserver does not recognise ndfs nameserver image
> ----------------------------------------------------------
>
>          Key: HADOOP-56
>          URL: http://issues.apache.org/jira/browse/HADOOP-56
>      Project: Hadoop
>         Type: Bug
>   Components: dfs
>     Versions: 0.1
>     Reporter: Yoram Arnon
>     Priority: Critical
>  Attachments: ndfs.tar.gz
>
> hadoop nameserver does not recognise ndfs image
> Thus, upgrading from ndfs to hadoop dfs results in total data loss.
> The upgrade should be seemless, with the new server recognising all previous version
that are not end-of-life'd.

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