Hi Christian,
Please see http://docs.neo4j.org/chunked/1.4.M06/ha.html for info on Neo4j
HA. You can run a coordinator and a Neo4j server on the same machines.
That's a common setup. As for how to query it, answering that requires some
more explanation about how Neo4j can be run.
Neo4j can be used in two deployment modes: embedded in a Java process, or
stand-alone server. The server however internally runs an embedded instance.
See http://docs.neo4j.org/chunked/1.4.M06/deployment-scenarios.html for more
information on this.
In an HA environment, a stand-alone server would be accessed over HTTP via
the REST API[1]. You can also write custom extensions[2] in order to deploy
Java code on the server so that you can build your own domain-specific query
API. If you're not using the stand-alone server, but instead using embedded
Neo4j in e.g. a web application deployed on Tomcat, then the API you expose
from your webapp is completely up to you. Internally it then uses an
embedded Neo4j instance, where you have full access to the Java API. In
addition to these options, you can also use our new query language,
Cypher[3]. You can try it out from the web administration interface of the
stand-alone server.
When setting up a Neo4j HA cluster, you typically also configure a load
balancer in front of the cluster. The load balancer can use any method it
desires to distribute the requests to the machines in the cluster. The load
balancer is however not included in the Neo4j distribution -- it is
something the user needs to provide. You could look into the Apache HTTP
Server or HAProxy.
Hope that answers some of your questions.
David
[1] http://docs.neo4j.org/chunked/1.4.M06/rest-api.html
[2] http://docs.neo4j.org/chunked/1.4.M06/server-plugins.html,
http://docs.neo4j.org/chunked/1.4.M06/server-unmanaged-extensions.html
[3] http://docs.neo4j.org/chunked/1.4.M06/cypher-query-lang.html
On Wed, Jul 6, 2011 at 11:22 AM, Christian Godde
christian.go...@googlemail.com wrote:
Hi there,
I am quite a newbie with neo4j and I hope somebody can help me.
I want to set up a Cluster with 6 Servers and a few Coordinators
(can a Server at the same time be a Coordinator?).
Theoretically the setting up of this cluster is more or less clear to me.
But the big question for me is:
How do I query this cluster?
So that I don't communicate with a single server all the time, but the
server with the lowest load at this time.
I hope you know what I mean.
Regards,
Christian
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David Montag david.mon...@neotechnology.com
Neo Technology, www.neotechnology.com
Cell: 650.556.4411
Skype: ddmontag
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