Yeah, but you don't want to drop all of the machines at the same time. When you decommission a node, you need to give the cluster time to rebalance before dropping a second node. That is of course if you don't mind losing any data. :-)
> Date: Tue, 28 Jun 2011 10:33:39 -0700 > Subject: Re: descaling hbase > From: [email protected] > To: [email protected] > > For the region servers you just need to shut them down, the master > will rebalance. > > For the datanodes you need to decommission them: > http://wiki.apache.org/hadoop/FAQ#I_want_to_make_a_large_cluster_smaller_by_taking_out_a_bunch_of_nodes_simultaneously._How_can_this_be_done.3F > > J-D > > On Tue, Jun 28, 2011 at 10:14 AM, Sam Seigal <[email protected]> wrote: > > Hi All, > > > > I have a 14 node cluster setup for HBase. Someone else in my office needs to > > use some of these machines and I would like to descale my cluster from 14 to > > 6 machines. > > Is there an efficient way to do this ? Since there is data residing on the > > machines I want to get rid of, are there utilities that would move this data > > for me and then rebalance the cluster ? > > > > Thanks, > > > > Sam > >
