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From "Konstantin Shvachko (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-702) DFS Upgrade Proposal
Date Fri, 10 Nov 2006 00:16:41 GMT
    [ http://issues.apache.org/jira/browse/HADOOP-702?page=comments#action_12448628 ] 
            
Konstantin Shvachko commented on HADOOP-702:
--------------------------------------------

Doug,
Do you mean a shell -list option to list FSSIDs?
Sure, if we displayed them in the web UI why not report the same via a shell command.

You actually can do rollback and preserve current version.
You need to upgrade current version to some new FSSID first then rollback to the old version.
But I agree this not very convenient.
So do we want to separate taking a snapshot to a special function?
It will still be a part of upgrade, we are just adding an api to call it independently?

Yoram,
I don't think we should require snapshots to be immutable.
The hard link scheme lets different versions coexist and being modified independently of each
other.

> 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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