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From "Billy Pearson" <sa...@pearsonwholesale.com>
Subject Re: Decommission of nodes
Date Wed, 27 May 2009 17:44:07 GMT
the decommissioning process in hadoop takes a little while I thank there the 
balancing bandwidth has a lot to do with it.
but to stop region server you should be able to run
bin/hbase-daemon.sh stop regionserver
on the server you want to stop the hbase as long as it not the master then 
you can do this on a live cluster.
as each goes down they will tell the master by closing the regions and 
releasing its leases and the master will start to redeploy the regions to 
other servers.


"Mat Hofschen" <hofschen@gmail.com> wrote in 
message news:d2b99530905270754p566be51n8dc468f9d1d2384b@mail.gmail.com...
> Hello,
> I just needed to remove 8 machines from our 33 node cluster. 
> (hadoop-0.19.1,
> hbase-0.19.2)
> The first 4 nodes I decommissioned in hadoop with the exclude-file and 
> hbase
> running. After 4 hours I gave up and stopped the machines by hand (they
> never finished the decommissioning in progress phase).
> For the next 4 nodes I stopped the hbase cluster then decommissioned the
> nodes in hadoop. After 10 minutes the decommissioning finished 
> successfully.
> Is there a recommended way to remove nodes from hbase and how does that 
> best
> work together with decommissioning in hadoop.
> How does hbase reconstruct the meta information during or after removal of
> nodes?
> Thanks for your help,
> Matthias

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