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Posted to common-user@hadoop.apache.org by Mark <st...@gmail.com> on 2011/11/16 17:59:07 UTC

Upgrading master hardware

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

Re: Upgrading master hardware

Posted by Mark <st...@gmail.com>.
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"<st...@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

Re: Upgrading master hardware

Posted by Karthik Ranganathan <kr...@fb.com>.
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" <st...@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

Fwd: Upgrading master hardware

Posted by Mark <st...@gmail.com>.
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