I believe you are trying to ask if it is recommended to use the
decommissioning feature to remove datanodes from your cluster, the answer
would be yes. As far as how to do it, there should be some information
here http://wiki.apache.org/hadoop/FAQ that should help.
On Tue, Feb 12, 2013 at 3:50 AM, Dhanasekaran Anbalagan
> Hi Guys,
> It's recommenced do with removing one the datanode in production cluster.
> via Decommission the particular datanode. please guide me.
> Did I learn something today? If not, I wasted it.