Thanks!
And yes I do actually have 3 master nodes!
I was hoping to learn more about the requirements of the client nodes (for
querying only). What work is actually performed by them? Simply querying
the data nodes and merging the results, or is more heavy-weight
in-memory aggregation and sorting done of those nodes that need RAM and CPU
power?
Den tirsdag den 18. november 2014 skrev Mark Walkom markwalkom@gmail.com:
You should really use 3 master nodes if you have a lot of data nodes,
having 3 makes getting a quorum a lot easier.I've previously run master nodes with 2 vcpus, 8GB RAM (4 heap) and 40 odd
data nodes, with sporadic querying and had no issues at all. Ultimately it
depends on your use case, but if you are having gains using your current
setup, then it makes sense to increase the hardware capabilities of what
you have and compare this to the previous setup, then make a call.On 18 November 2014 23:11, Lasse Schou <lasseschou@gmail.com
<javascript:_e(%7B%7D,'cvml','lasseschou@gmail.com');>> wrote:Hi,
There is an excellent question asked about two years ago that was never
properly answered:
Redirecting to Google GroupsI 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?Thanks,
Lasse--
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