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 -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elasticsearch/e8f9926e-2265-4682-84f7-f1e063781c16%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
