I might as well ask a related question...
We're in a similar position to the OP, expanding and rearchitecting a
cluster that's currently undersized. We'll have our new cluster spread
across two datacenters, so I'm trying to figure out how to setup the nodes.
We'll have 4 data nodes, the database will probably land somewhere around
750-1000 GB, it's a Graylog2 cluster so I'm not sure how many shards we'll
have in the end, but we'll go with 2 replicas per shard so that we never
end up with one shard being in just one DC. Likewise the Graylog2 servers
will be spread between the two DC's, two per DC.
How many masters would be recommended for this? My initial thought would be
that two would be good enough. The two failure scenarios I see as most
likely(or perhaps least unlikely if you're an optimist) are:
Master ES crashes - Other master takes over.
The link between the DC's goes down or flaps - Won't matter if we have 1 or
2 masters per DC anyway.
So would 2 masters, one per DC be good enough for this setup?
Regards
Johan
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