Dedicated master nodes are super convenient if you have the it
infrastructure to host them on shared machines because they are very low
load and its useful to be able to restart the master nodes quickly. We
don't have that kind of infrastructure and our cluster is pretty large and
not having it has bitten us once or twice but its not a huge problem.



On Fri, May 29, 2015 at 10:44 AM, Xudong You <xudong....@gmail.com> wrote:

> Right now we only need 4 ES nodes due to the small data volume, and all 4
> nodes are master & data nodes.
>
> Q1:
> I am wondering in this case, is it necessary to have dedicated master and
> client node? Any benefit of having dedicated master node?
>
> Some one said that dedicated master nodes (say, three master nodes) is
> helpful to avoid the split brain issue, but even we have NO dedicated
> master nodes, we can also avoid the split brain by setting the 
> *discovery.zen.minimum_master_nodes
> *to a appropriate value.
>
> Q2:
> Similarly, is dedicated client node really necessary in our 4 nodes case?
> Any benefit of allocating dedicated client node?
>
> Thanks!
>
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