Be aware that this also only works if the namenode/Job tracker does not need to
be upgraded. If it does then you have to have downtime to restart them.
We are working on getting rolling upgrades in the code but there are a number
of large prerequisites to really make it work, so it is not likel
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
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
