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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-702) DFS Upgrade Proposal
Date Thu, 09 Nov 2006 20:37:38 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-702?page=comments#action_12448580 ] 
Doug Cutting commented on HADOOP-702:

Should there also be a '-list' option, that lists all known FSSIDs?

Also, must rollback always remove the newer version?  If changes were made there they will
be lost.  Someone might want to rollback to revert to an old version to test something, or
even to find a deleted file, then switch back to the newer version.  In effect these are filesystem
checkpoints.  We probably don't want to encourage use of them as checkpoints right off, but
we also shouldn't do things that prohibit it, like removing versions whenever we switch versions.

> DFS Upgrade Proposal
> --------------------
>                 Key: HADOOP-702
>                 URL: http://issues.apache.org/jira/browse/HADOOP-702
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: dfs
>            Reporter: Konstantin Shvachko
>         Attachments: DFSUpgradeProposal.html
> Currently the DFS cluster upgrade procedure is manual.
> http://wiki.apache.org/lucene-hadoop/Hadoop_Upgrade
> It is rather complicated and does not guarantee data recoverability in case of software
errors or administrator mistakes.
> This is a description of utilities that make the upgrade process almost automatic and
minimize chance of loosing or corrupting data.
> Please see the attached html file for details.

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