# High jvm memory

**URL:** <https://discuss.elastic.co/t/high-jvm-memory/224605>\
**Category:** Elasticsearch\
**Created:** [March 23, 2020, 7:09am UTC](https://discuss.elastic.co/t/high-jvm-memory/224605 "2020-03-23T07:09:20Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jof300](https://avatars.discourse-cdn.com/v4/letter/j/3da27b/32.png) [@jof300](https://discuss.elastic.co/u/jof300)\
**Post date:** [March 23, 2020, 7:09am UTC](https://discuss.elastic.co/t/high-jvm-memory/224605/1 "2020-03-23T07:09:21Z")

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Hello,

We have a cluster composed of 3 masters and 4 data nodes.

Each data node's jvm has 30Go memory allowed. The disk usage on 4 data nodes is around 17 To. There is actually no indexes closed.

We see 2 things :

1. data node jvm is frequently high ( \> 80%).
2. we already had circuit breaker problem twice

My questions are:

- What makes jvm using so many memory?
- Do opened indices are playing a role in that ?
- Any method to lower this jvm usage ?

Regards

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**Author:** ![Christian\_Dahlqvist](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/christian_dahlqvist/32/4617_2.png) [@Christian\_Dahlqvist](https://discuss.elastic.co/u/Christian_Dahlqvist)\
**Post date:** [March 29, 2020, 2:23pm UTC](https://discuss.elastic.co/t/high-jvm-memory/224605/2 "2020-03-29T14:23:47Z")

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Have a look at [this webinar](https://www.elastic.co/webinars/optimizing-storage-efficiency-in-elasticsearch) as it discusses heap usage and how to reduce it.

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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:** [April 26, 2020, 2:24pm UTC](https://discuss.elastic.co/t/high-jvm-memory/224605/3 "2020-04-26T14:24:05Z")

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