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From Mark <static.void....@gmail.com>
Subject Re: Upgrading master hardware
Date Wed, 16 Nov 2011 18:55:54 GMT
So obviously there will be a short interruption while I shut down the NN 
on 1 machine and start it up on another?

On 11/16/11 10:53 AM, Karthik Ranganathan wrote:
> Mark,
> If the NN goes down the entire HBase cluster will be halted. If the
> HMaster is down, you will not be able to get regions assigned (in case any
> regionserver goes down).
> So the best thing to do is start NN and Hmaster on another node, do you
> upgrade and move them back.
> Thanks
> Karthik
> On 11/16/11 10:42 AM, "Mark"<static.void.dev@gmail.com>  wrote:
>> We will be adding more memory into our master node in the near future.
>> We generally don't mind if our map/reduce jobs are unable to run for a
>> short period but we are more concerned about the impact this may have on
>> our HBase cluster. Will HBase continue to work will hadoops name-node
>> and/or HMaster is down? If not where are some ways we could minimize our
>> downtime? Thanks

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