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From Jeff Sposetti <j...@hortonworks.com>
Subject Re: Journal Nodes in a multi-site environment
Date Wed, 11 Dec 2013 20:49:50 GMT
Adding in some Hadoop folks to chime in here.


On Wed, Dec 11, 2013 at 5:35 AM, Chadwick Banning <chadwickbanning@gmail.com
> wrote:

> Hi all,
>
> I have an Ambari 1.4/HDP 2.0.6 environment that is split between two data
> centers -- a main site and a recovery site.  We have NameNode HA enabled
> with automatic failover and the problem we are facing is how to divide the
> journal nodes across both sites so that failover happens appropriately.
>
> It seems that only one site will always have a majority of journal nodes
> and if that site NN were to go down, the other site NN would no longer be
> able to start as it couldn't reach a majority of the journal nodes.
>
> Is there any way around this?  I know an odd number of journal nodes is
> recommended but what would happen if we were to place an even number of
> journal nodes at each site?
>
> Thanks for any input!
>

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