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https://issues.apache.org/jira/browse/HADOOP-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12462312
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Konstantin Shvachko commented on HADOOP-702:
--------------------------------------------
Current proposal is now in DFSUpgradeProposal3.html
And FSStateTransition.html contains more detailed algorithms.
> DFS Upgrade Proposal
> --------------------
>
> Key: HADOOP-702
> URL: https://issues.apache.org/jira/browse/HADOOP-702
> Project: Hadoop
> Issue Type: New Feature
> Components: dfs
> Reporter: Konstantin Shvachko
> Assigned To: Konstantin Shvachko
> Attachments: DFSUpgradeProposal.html, DFSUpgradeProposal2.html,
> DFSUpgradeProposal3.html, FSStateTransition.html, TestPlan-HdfsUpgrade.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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