# High CPU Utilzation in ES Cluster 5.6

**URL:** <https://discuss.elastic.co/t/high-cpu-utilzation-in-es-cluster-5-6/101449>\
**Category:** Elasticsearch\
**Created:** [September 22, 2017, 8:48am UTC](https://discuss.elastic.co/t/high-cpu-utilzation-in-es-cluster-5-6/101449 "2017-09-22T08:48:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Aswin\_Sathish](https://avatars.discourse-cdn.com/v4/letter/a/d78d45/32.png) [@Aswin\_Sathish](https://discuss.elastic.co/u/Aswin_Sathish)\
**Post date:** [September 22, 2017, 8:48am UTC](https://discuss.elastic.co/t/high-cpu-utilzation-in-es-cluster-5-6/101449/1 "2017-09-22T08:48:47Z")

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Hi

We have a 3 node master-data ES cluster . We face random high cpu utilization in random nodes though there is no much of activity happening in ES.  
This high cpu utilization and Load stays forever until the node is restarted by killing the ES process.  
Service restart also doesnt work in this case

We are using ES 5.6 and openjdk version "1.8.0\_144"

Other problem is when we restart the ES node the shards are not evenly distributed and gets assigned on single node.

I am pasting the output of \_node/hot\_threads query

[https://pastebin.com/ptzV5zjx](https://pastebin.com/ptzV5zjx)

I am not that expert in ES.

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [October 20, 2017, 8:49am UTC](https://discuss.elastic.co/t/high-cpu-utilzation-in-es-cluster-5-6/101449/2 "2017-10-20T08:49:06Z")

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Closed on October 20, 2017, 8:49am UTC

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