# Memory suddenly bumps which cause full gc

**URL:** <https://discuss.elastic.co/t/memory-suddenly-bumps-which-cause-full-gc/19186>\
**Category:** Elasticsearch\
**Created:** [August 11, 2014, 8:02am UTC](https://discuss.elastic.co/t/memory-suddenly-bumps-which-cause-full-gc/19186 "2014-08-11T08:02:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![xlvector](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/xlvector/32/1350_2.png) [@xlvector](https://discuss.elastic.co/u/xlvector)\
**Post date:** [August 11, 2014, 8:02am UTC](https://discuss.elastic.co/t/memory-suddenly-bumps-which-cause-full-gc/19186/1 "2014-08-11T08:02:28Z")

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I have a cluster of 2 nodes, index 150GB data with SSD, every node have 32G RAM and I set heap size to 16GB for elasticsearch.

I use realtime index which means I write/search indices at the same time. I use bigdesk to monitor the JVM.

However, I find that the memory suddenly bumps from 50% heap size to 80% heap size every several minutes and then cause Full GC which will make search request hang up for 10 seconds. This happened frequently.

I have set the indices.store.throttle.max\_bytes\_per\_sec for merge. And the index request is about 500MB per hour while query request per second is 150.

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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:** [July 6, 2017, 1:09am UTC](https://discuss.elastic.co/t/memory-suddenly-bumps-which-cause-full-gc/19186/2 "2017-07-06T01:09:40Z")

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Closed on July 6, 2017, 1:09am UTC