There is an excellent question asked about two years ago that was never
I have the exact same question. I've got a cluster with a lot of data nodes
plus two nodes that act as master + client nodes (no data).
For now I'm using those two nodes for both master (shard/cluster
management) tasks and client tasks (query handling).
I've seen a big performance gain when querying the client nodes, compared
to querying my very busy data nodes directly.
But I'd still like to get your view on the hardware requirements of the
master/client nodes. Is RAM important for serving the query results, or is
most RAM-heavy tasks performed by the data nodes? And similarly, is CPU
important on the client nodes?
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