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From Dmitriy Lyubimov <dlie...@gmail.com>
Subject Re: data node maintainance question
Date Wed, 22 Sep 2010 19:58:02 GMT
Thank you. just suspected as much.

-Dmitriy

On Wed, Sep 22, 2010 at 12:42 PM, Allen Wittenauer <awittenauer@linkedin.com
> wrote:

>
> On Sep 22, 2010, at 12:36 PM, Dmitriy Lyubimov wrote:
> > i have a datanode maintenance question.
> >
> > if i bring a data node for memory upgrade down for several hours and then
> return it back, i don't need to run decommission? decommission is only if i
> want to get rid of that node for good and now want to re-distribute its
> blocks, right?
>
>
>         Hadoop will treat it as a failure and will start re-replicating the
> blocks on that node.   When the node is added back into the system, it will
> delete the extra replications.  Those extra replications may or may not be
> on the same node that you re-added.
>
>
> > Or i will be risking some sort of 'split brain' inconsistency?
>
>         Nah, should be fine.
>
>

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