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 <sudha...@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
