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https://issues.apache.org/jira/browse/HADOOP-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12486511
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Owen O'Malley commented on HADOOP-702:
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My objections have been addressed and I think this should be committed. There
are a couple of things that I'd like cleaned up eventually, but they shouldn't
block the patch at this point, in my opinion.
1. The UpgradeUtilities in test should be merged with mini-dfs cluster.
2. The static class in FileUtils for HardLink seems unnecessary.
3. FileUtils.HardLink.createLink handles InterruptedException badly.
> 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
> Fix For: 0.13.0
>
> Attachments: DFSUpgradeProposal3.html, FSStateTransition6.htm,
> FSStateTransitionApr03.patch, TestPlan-HdfsUpgrade.html,
> TestPlan-HdfsUpgrade.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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