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From Michael Segel <michael_se...@hotmail.com>
Subject RE: descaling hbase
Date Tue, 28 Jun 2011 18:36:41 GMT

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: jdcryans@apache.org
> To: user@hbase.apache.org
> 
> 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 <selekt86@yahoo.com> 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
> >
 		 	   		  
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