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http://issues.apache.org/jira/browse/HADOOP-702?page=comments#action_12448632 ] 
            
Yoram Arnon commented on HADOOP-702:
------------------------------------

read-write snapshots are possible, maybe even 'neat' from a technology 
standpoint.
They're just hard to manage. I know of no file systems then implement them 
though they're common in revision control systems.
I recommend against it in hdfs.

> 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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