A node client is not just a non-data node although very close. The ES page
describes a proxy node scenario. Example: you have many HTTP clients and
they search for large result sets. This is often a challenge because of the
high resource contention. One or more data-less proxy nodes can help in
gathering these result sets, letting the data nodes alone, which just do
the scatter part of the search.
This is similar to how a TransportClient works for a JVM-only client.
TransportClient is also a proxy node that gathers result sets. But with
some subtle difference, you can not connect HTTP clients to a
TransportClient, and because the TransportClient is not a cluster member,
it uses the configured connected nodes as gather nodes within the cluster.
Because there are two gather nodes, this is called an "extra hop" in
comparison to a Java NodeClient. But, if you add the HTTP client request to
the request scenario mentioned before, there is no extra hop, only an extra
JVM. So the best place for TransportClient is on a remote host.
In Java, NodeClient and TransportClient share the full functionality of ES,
routing requests, round-robin for load balancing etc. For cluster-specific
server-only services like listening to cluster state, or snapshot/restore,
a TransportClient is not feasible, it can't do it or must ask a node in the
cluster for passing the information.
Jörg
On Fri, Aug 29, 2014 at 8:54 PM, John Smith java.dev.mtl@gmail.com wrote:
According to this...
Elasticsearch Platform — Find real-time answers at scale | Elastic
Non data nodes (I assume Node client is equivalent of a non data node) is
capable of scatter/gather searching. Was wondering if transport can do this
also?
2- Does transport support routing if you specify routing field? Or does it
always round robin regardless?
On Aug 29, 2014 12:09 PM, "joergprante@gmail.com" joergprante@gmail.com
wrote:
I'm not exactly sure what you mean by scatter-gather, but yes, both
clients can execute requests on all nodes of the cluster.
Jörg
On Fri, Aug 29, 2014 at 3:43 PM, John Smith java.dev.mtl@gmail.com
wrote:
Just as the subject asks or only the node client can do scatter gather?
Thanks
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