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From Todd Lipcon <t...@cloudera.com>
Subject Re: Checkpoint vs Backup Node
Date Wed, 25 May 2011 01:12:48 GMT
Hi Sulabh,

Neither of these nodes have been "productionized" -- so I don't think
anyone would have a good answer for you about what works in
production. They are only available in 0.21 and haven't had any
substantial QA.

One of the potential issues with the BN is that it can delay the
logging of edits by the primary NN, if the BN were to hang or go
offline. The CN would not have such an issue.


On Tue, May 24, 2011 at 5:08 PM, sulabh choudhury <sulabhc@gmail.com> wrote:
> As far as my understanding goes, I feel that Backup node is much more
> efficient then the Checkpoint node, as it has the current(up-to-date) copy
> of file system too.
> I do not understand what would be the use case (in a production environment)
> tin which someone would prefer Checkpoint node over Backup node, or I should
> ask, what do people generally prefer of the two and why ?

Todd Lipcon
Software Engineer, Cloudera

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