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From Mat Hofschen <hofsc...@gmail.com>
Subject Re: Decommission of nodes
Date Thu, 28 May 2009 11:12:54 GMT

how does hbase react to hadoop decommissioning nodes?
Should I shutdown the regionservers first, before decommissioning or does it
matter at all? Is it possible that a running hbase prevents decommissioning
to finish?


On Wed, May 27, 2009 at 7:44 PM, Billy Pearson

> 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.
> Billy
> "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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