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From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-702) DFS Upgrade Proposal
Date Thu, 25 Jan 2007 02:03:49 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12467224
] 

Yoram Arnon commented on HADOOP-702:
------------------------------------

losing the capability for multiple snapshots is regrettable, but if the snapshots aren't maintained
and are just left there to rot then perhaps it's not such a bad thing. A full snapshots solution
will need to wait until it's done, well, fully.

Not being able to restart just the name node with an upgraded version is regrettable too,
since we've seen cases where a tiny namenode bug is fixed and it's *much* simpler to update
just one node than to update the entire cluster. Can that limitation be relaxed?

Datanodes automatically "catching up" on a missed previous upgrade/discard seems like a good
thing, isn't it?

The benchmark - was it executed on a machine with a single disk or several? How fast can links
be created (and deleted) on a machine with several disks?

> 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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