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From Allen Wittenauer <awittena...@linkedin.com>
Subject Re: data node maintainance question
Date Wed, 22 Sep 2010 19:42:28 GMT

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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