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From Joey Echeverria <j...@cloudera.com>
Subject Re: Hadoop online upgrade
Date Fri, 08 Jul 2011 12:00:49 GMT
It depends on the versions. Some minor updates are compatible with each other and you can do
rolling restarts.

If you're using less than 50% of your total storage, you could decommission half of your cluster,
upgrade that half, distcp to the new cluster and then upgrade the other half. 

-Joey



On Jul 8, 2011, at 1:51, Sudharsan Sampath <sudhan65@gmail.com> wrote:

> 
> Hi,
> 
> Is it possible to upgrade to a newer version of hadoop without bringing the cluster down?
To my understanding its not. But just wondering..
> 
> Thanks
> Sudharsan S

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