# Unequal load on nodes within single cluster on EC2 **URL:** \ **Category:** Elasticsearch\ **Created:** [April 24, 2014, 1:36pm UTC](https://discuss.elastic.co/t/unequal-load-on-nodes-within-single-cluster-on-ec2/17176 "2014-04-24T13:36:32Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![Tomasz\_Danielczyk](https://avatars.discourse-cdn.com/v4/letter/t/ec9cab/32.png) [@Tomasz\_Danielczyk](https://discuss.elastic.co/u/Tomasz_Danielczyk)\ **Post date:** [April 24, 2014, 1:36pm UTC](https://discuss.elastic.co/t/unequal-load-on-nodes-within-single-cluster-on-ec2/17176/1 "2014-04-24T13:36:32Z")
Hi, I'm having problems with load distribution between nodes within single cluster. ES version is 0.90.12. My configuration is 5 nodes (m3.xlarge machines on EC2) located in 3 different zones (2+2+1) with EC2 discovery. All nodes with data. Index has 5 shards with 2 replicas, and is distributed using force awareness with attribute "zone" set to "zone1", "zone2" or "zone3". All nodes works well and process search requests. Cluster state is green. I've got heap memory increased to 8GB. Problem starts when I'm not using load balancer and all search requests hits the same node. It looks line ES doesn't distribute work between all nodes within the cluster, but only the ones within the same zone. Search queue for these nodes is growing, while machines from different zones has CPU usage 0% and no searches (I'm using bigdesk stats). During this test I send only search requests, nothing else. Most parameters have default values (nodes, index). (When I use only single zone for all 5 nodes, something similar happens - only set of nodes that together contains all shards is working, while the rest of nodes do nothing) Is there any reason why ES behaves in such a way? Thanks! Tom -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/6e764719-4b9d-4036-b0eb-8dbeb8d45657%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/6e764719-4b9d-4036-b0eb-8dbeb8d45657%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![nik9000](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nik9000/32/44947_2.png) [@nik9000](https://discuss.elastic.co/u/nik9000)\ **Post date:** [April 24, 2014, 1:48pm UTC](https://discuss.elastic.co/t/unequal-load-on-nodes-within-single-cluster-on-ec2/17176/2 "2014-04-24T13:48:25Z")
Is it this? > **[Elasticsearch Platform — Find real-time answers at scale](https://www.elastic.co)** > > Power insights and outcomes with the Elasticsearch Platform and AI. See into your data and find answers that matter with enterprise solutions designed to help you build, observe, and protect. Try Elasticsearch free today. Nik On Thu, Apr 24, 2014 at 9:36 AM, Tomasz Danielczyk \< [tomasz.danielczyk@gmail.com](mailto:tomasz.danielczyk@gmail.com)\> wrote: > Hi, > > I'm having problems with load distribution between nodes within single > cluster. ES version is 0.90.12. My configuration is 5 nodes (m3.xlarge > machines on EC2) located in 3 different zones (2+2+1) with EC2 discovery. > All nodes with data. Index has 5 shards with 2 replicas, and is distributed > using force awareness with attribute "zone" set to "zone1", "zone2" or > "zone3". All nodes works well and process search requests. Cluster state is > green. I've got heap memory increased to 8GB. > > Problem starts when I'm not using load balancer and all search requests > hits the same node. It looks line ES doesn't distribute work between all > nodes within the cluster, but only the ones within the same zone. Search > queue for these nodes is growing, while machines from different zones has > CPU usage 0% and no searches (I'm using bigdesk stats). During this test I > send only search requests, nothing else. Most parameters have default > values (nodes, index). > > (When I use only single zone for all 5 nodes, something similar happens - > only set of nodes that together contains all shards is working, while the > rest of nodes do nothing) > > Is there any reason why ES behaves in such a way? > > Thanks! > Tom > > -- > You received this message because you are subscribed to the Google Groups > "elasticsearch" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). > To view this discussion on the web visit > [https://groups.google.com/d/msgid/elasticsearch/6e764719-4b9d-4036-b0eb-8dbeb8d45657%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/6e764719-4b9d-4036-b0eb-8dbeb8d45657%40googlegroups.com)[https://groups.google.com/d/msgid/elasticsearch/6e764719-4b9d-4036-b0eb-8dbeb8d45657%40googlegroups.com?utm\_medium=email&utm\_source=footer](https://groups.google.com/d/msgid/elasticsearch/6e764719-4b9d-4036-b0eb-8dbeb8d45657%40googlegroups.com?utm_medium=email&utm_source=footer) > . > For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/CAPmjWd2BvJ%2BTrtNP9m7wd9Dovb-ZGoZ6M3xzJEQtW2o4drB70A%40mail.gmail.com](https://groups.google.com/d/msgid/elasticsearch/CAPmjWd2BvJ%2BTrtNP9m7wd9Dovb-ZGoZ6M3xzJEQtW2o4drB70A%40mail.gmail.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 6, 2017, 1:33am UTC](https://discuss.elastic.co/t/unequal-load-on-nodes-within-single-cluster-on-ec2/17176/3 "2017-07-06T01:33:44Z")