# APM Java agent - Implement client-side load balancing **URL:** \ **Category:** APM\ **Tags:** java, rum\ **Created:** [August 27, 2019, 1:56pm UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961 "2019-08-27T13:56:28Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![rijash](https://avatars.discourse-cdn.com/v4/letter/r/c2a13f/32.png) [@rijash](https://discuss.elastic.co/u/rijash)\ **Post date:** [August 27, 2019, 1:56pm UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/1 "2019-08-27T13:56:28Z")
**Kibana version** : 7.3.0 **Elasticsearch version** : 7.3.0 **APM Server version** : 7.3.0 **APM Agent language and version** : 1.9.0 Hi, I am trying to implement client side load-balance for multiple apm servers. I am using the below configuration - **server\_urls=http://loadbalancer/\:8200,[http://loadbalancer/](http://loadbalancer/)\:8200,[http://loadbalancer/](http://loadbalancer/)\:8200** But, it is giving me the below error. 2019-08-27 13:55:24.806 [apm-reporter] ERROR co.elastic.apm.agent.report.IntakeV2ReportingEventHandler - Error sending data to APM server: Server returned HTTP response code: 502 for URL: [http://loadbalancer/](http://loadbalancer/)\:8200/intake/v2/events, response code is 502 Could you please help here. Thanks. Regards, Rijash ---
**Author:** ![felixbarny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/felixbarny/32/27341_2.png) [@felixbarny](https://discuss.elastic.co/u/felixbarny)\ **Post date:** [August 27, 2019, 2:32pm UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/2 "2019-08-27T14:32:08Z")
Could you send me the output of `curl http://loadbalancer/:8200/` and `curl -H 'Content-Type: application/x-ndjson' -XPOST http://loadbalancer/:8200/intake/v2/events`? ---
**Author:** ![rijash](https://avatars.discourse-cdn.com/v4/letter/r/c2a13f/32.png) [@rijash](https://discuss.elastic.co/u/rijash)\ **Post date:** [August 28, 2019, 7:09am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/3 "2019-08-28T07:09:29Z")
Thanks for your response felix. PFB the output :~ # curl -H 'Content-Type: application/x-ndjson' -XPOST [http://loadbalancer/](http://loadbalancer/)\:8200/intake/v2/events? curl: (6) Could not resolve host: loadbalancer :~ # curl [http://loadbalancer/](http://loadbalancer/)\:8200/ curl: (6) Could not resolve host: loadbalancer ---
**Author:** ![felixbarny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/felixbarny/32/27341_2.png) [@felixbarny](https://discuss.elastic.co/u/felixbarny)\ **Post date:** [August 28, 2019, 7:39am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/4 "2019-08-28T07:39:09Z")
Seems like there are connection issues so that the agent can’t connect to your load balancer. Once those are resolved, the agent should be able to connect. Question: it seems you already have a load balancer. Why do you also want to apply client side load balancing? ---
**Author:** ![rijash](https://avatars.discourse-cdn.com/v4/letter/r/c2a13f/32.png) [@rijash](https://discuss.elastic.co/u/rijash)\ **Post date:** [August 29, 2019, 7:37am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/5 "2019-08-29T07:37:28Z")
My intention is to route the events uniformly onto a list of apm servers configured for the environment. I think below configuration is working for the same in apm java agent. server\_urls=http://\:8200,http://\:8200,http://\:8200 My next question is, can it be work for RUM agent configuration as well. Like is the below configuration is correct for RUM agent configuration, ``` var pageName = window.location.pathname; window.elasticApm.init({ serviceName: 'bizx', environment: 'preview', pageLoadTransactionName: pageName, logLevel: 'info', serverUrl: 'http://:8200,http://:8200,http://:8200' }); ``` ---
**Author:** ![felixbarny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/felixbarny/32/27341_2.png) [@felixbarny](https://discuss.elastic.co/u/felixbarny)\ **Post date:** [August 29, 2019, 8:05am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/6 "2019-08-29T08:05:26Z")
The RUM agent currently does not support that. Could you create a feature request issue in the rum agent’s GitHub repo? ---
**Author:** ![rijash](https://avatars.discourse-cdn.com/v4/letter/r/c2a13f/32.png) [@rijash](https://discuss.elastic.co/u/rijash)\ **Post date:** [August 29, 2019, 8:20am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/7 "2019-08-29T08:20:55Z")
Sure. But in that case, if i want to handle the load for RUM agent data. How can we achieve it ? Like how can we distribute the RUM data from multiple host to multiple APM servers? Is there any option available ? ---
**Author:** ![felixbarny](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/felixbarny/32/27341_2.png) [@felixbarny](https://discuss.elastic.co/u/felixbarny)\ **Post date:** [August 29, 2019, 8:44am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/8 "2019-08-29T08:44:23Z")
Currently only by placing an HTTP load balancer in front of your APM Servers. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [September 19, 2019, 4:44am UTC](https://discuss.elastic.co/t/apm-java-agent-implement-client-side-load-balancing/196961/9 "2019-09-19T04:44:29Z")
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