[jira] Commented: (HADOOP-702) DFS Upgrade Proposal

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[jira] Commented: (HADOOP-702) DFS Upgrade Proposal

JIRA jira@apache.org

    [ https://issues.apache.org/jira/browse/HADOOP-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12467727 ]

Yoram Arnon commented on HADOOP-702:

the last comment leads me to thinking about online upgrades. While this is a ways off, at some point we'll want to upgrade the dfs gradually, without bringing it down, especially for minor changes. I envision upgrading the namenode, which is backwards compatible with the previous version of the datanodes, and having the datanodes upgrade gradually later.
That would require allowing a version mismatch between namenode and datanodes.

> 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, 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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