# Is this recycle of soft reference?

**URL:** <https://discuss.elastic.co/t/is-this-recycle-of-soft-reference/148559>\
**Category:** Elasticsearch\
**Created:** [September 14, 2018, 6:48am UTC](https://discuss.elastic.co/t/is-this-recycle-of-soft-reference/148559 "2018-09-14T06:48:32Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![LLRukia](https://avatars.discourse-cdn.com/v4/letter/l/a3d4f5/32.png) [@LLRukia](https://discuss.elastic.co/u/LLRukia)\
**Post date:** [September 14, 2018, 6:48am UTC](https://discuss.elastic.co/t/is-this-recycle-of-soft-reference/148559/1 "2018-09-14T06:48:32Z")

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![DevCap_20180914_142644](https://us1.discourse-cdn.com/elastic/original/3X/c/c/cc0fc37ab7b4d434a4955e8a81d33cf091cb19af.png)

In this picture, there is a steep drop in JVM Heap graph between 8 a.m. to 9 a.m.. I am wondering the reason of this.

My log entered smoothly at that time (8 a.m to 9 a.m).

 ![1](https://us1.discourse-cdn.com/elastic/original/3X/6/8/686d24a71934b39d359545a51f47c2140f0e4694.png)

What is that? Is recycle of soft reference in Java?  
This is important cause I am investigating how much heap size is suitable for my service.

Version of Elastic stack is 6.3.1, and my server os is  
Linux 581dd302fe61 3.10.0-327.el7.x86\_64 #1 SMP Thu Nov 19 22:10:57 UTC 2015 x86\_64 x86\_64 x86\_64 GNU/Linux

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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 12, 2018, 6:48am UTC](https://discuss.elastic.co/t/is-this-recycle-of-soft-reference/148559/2 "2018-10-12T06:48:32Z")

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Closed on October 12, 2018, 6:48am UTC

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