That's why you should use the DN decommissioning feature that I referred to. You can do it for 20 machines all at the same time if you want as long as you have the capacity.
J-D On Tue, Jun 28, 2011 at 11:36 AM, Michael Segel <[email protected]> wrote: > > 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 >> > >
