# Loadbalancer infromt of client nodes **URL:** \ **Category:** Elasticsearch\ **Created:** [October 11, 2017, 4:42am UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463 "2017-10-11T04:42:58Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![iam.Carrot](https://avatars.discourse-cdn.com/v4/letter/i/a9adbd/32.png) [@iam.Carrot](https://discuss.elastic.co/u/iam.Carrot)\ **Post date:** [October 11, 2017, 4:42am UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/1 "2017-10-11T04:42:58Z")
Hi am running a 7 node architecture with 3 master nodes, 2 co-ordinate only (earlier known as client) and 2 data nodes. I ab API to interact with my elastic cluster to provide data. My question is, do I need to put a load balancer between the two client nodes. Because I read somewhere that the client nodes act as "smart load balancers" in the cluster themselves. How do i ensure that the queries would be equally distributed over both my clients. While establishing the connection in the API, we have to pass in the `node.name` as well and I am setting it as the name of the first client node. And when i put the name of the domain instead, of the ip of the client node, then it gives me a `node not found exception`. If I do have to use a loadbalancer, which load balancer should I be using `HTTP` or `TCP`? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [October 11, 2017, 5:52am UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/2 "2017-10-11T05:52:21Z")
What is the jdbc driver you are using? ---
**Author:** ![iam.Carrot](https://avatars.discourse-cdn.com/v4/letter/i/a9adbd/32.png) [@iam.Carrot](https://discuss.elastic.co/u/iam.Carrot)\ **Post date:** [October 11, 2017, 6:35am UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/3 "2017-10-11T06:35:42Z")
@dadoonet I've updated the question I was wrong to put in the JDBC ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [October 11, 2017, 6:56am UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/4 "2017-10-11T06:56:55Z")
What is the client you are using? ---
**Author:** ![sudpaw](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/sudpaw/32/39941_2.png) [@sudpaw](https://discuss.elastic.co/u/sudpaw)\ **Post date:** [October 11, 2017, 11:49am UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/5 "2017-10-11T11:49:34Z")
I am wondering the same question. Setup: 12 Data nodes. 3 Master nodes. 3 Coordinating nodes. ES version 5.6.2. I am providing the client with a list of dns names of the coordinating nodes. However it seems like there is no real balance between the nodes - if i put high load on one coordinating node - by doing a big agg. other requests (which should then use the other nodes) is getting errors. I am considering to change the order of node names for each client connected. ---
**Author:** ![iam.Carrot](https://avatars.discourse-cdn.com/v4/letter/i/a9adbd/32.png) [@iam.Carrot](https://discuss.elastic.co/u/iam.Carrot)\ **Post date:** [October 11, 2017, 12:04pm UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/6 "2017-10-11T12:04:09Z")
@dadoonet The client means the "coordinate only nodes". They used to be called client nodes before. If you mean how am I trying to interact with the client nodes, then I have a java API application that uses spring tcp connection to establish a connection to my cluster. ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [October 11, 2017, 2:46pm UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/7 "2017-10-11T14:46:35Z")
So Client nodes are part of the cluster. They know exactly where the shards are located on the cluster. > do I need to put a load balancer between the two client nodes. No. Just give the list of the 2 client nodes to your client (the Java one you mentioned). ---
**Author:** ![iam.Carrot](https://avatars.discourse-cdn.com/v4/letter/i/a9adbd/32.png) [@iam.Carrot](https://discuss.elastic.co/u/iam.Carrot)\ **Post date:** [October 11, 2017, 3:11pm UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/8 "2017-10-11T15:11:17Z")
@dadoonet > [@dadoonet](#): > > Just give the list of the 2 client nodes to your client (the Java one you mentioned). I don't have a place for two client names below is the java code: ``` client = TransportClient.builder().settings(Settings.builder().put("cluster.name", "ates").put("node.name","ates-client-01")).build(); ``` where I put in the client name and there is no way I can put in multiple node names. When you say, list the 2 client nodes in java, where exactly do you mean? ---
**Author:** ![dadoonet](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/dadoonet/32/137187_2.png) [@dadoonet](https://discuss.elastic.co/u/dadoonet)\ **Post date:** [October 11, 2017, 3:24pm UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/9 "2017-10-11T15:24:45Z")
That's a wrong usage of the transport client. Look at the doc: [https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/transport-client.html](https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/transport-client.html) ```auto TransportClient client = new PreBuiltTransportClient(Settings.EMPTY) .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host1"), 9300)) .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("host2"), 9300)); ``` That's all what you need here. May be add `client.transport.ignore_cluster_name` in the settings or the cluster name if you wish but that's all. ---
**Author:** ![iam.Carrot](https://avatars.discourse-cdn.com/v4/letter/i/a9adbd/32.png) [@iam.Carrot](https://discuss.elastic.co/u/iam.Carrot)\ **Post date:** [October 11, 2017, 3:49pm UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/10 "2017-10-11T15:49:41Z")
@dadoonet great I'll try it and get back. Thanks for the help. The getting back will take a while as it's midnight here. but I'll try it first thing in the morning ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [November 8, 2017, 3:50pm UTC](https://discuss.elastic.co/t/loadbalancer-infromt-of-client-nodes/103463/11 "2017-11-08T15:50:19Z")
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