# Filter cache and field data caches

**URL:** <https://discuss.elastic.co/t/filter-cache-and-field-data-caches/22857>\
**Category:** Elasticsearch\
**Created:** [March 24, 2015, 2:17pm UTC](https://discuss.elastic.co/t/filter-cache-and-field-data-caches/22857 "2015-03-24T14:17:12Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Vladi\_Feigin](https://avatars.discourse-cdn.com/v4/letter/v/258eb7/32.png) [@Vladi\_Feigin](https://discuss.elastic.co/u/Vladi_Feigin)\
**Post date:** [March 24, 2015, 2:17pm UTC](https://discuss.elastic.co/t/filter-cache-and-field-data-caches/22857/1 "2015-03-24T14:17:12Z")

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Hi All,

We observe the relatively high heap usage : 70-75% per node. Our heap size  
is 32G. Each node has 2 shards (one primary , one replica). Each shard size  
is approximately 43G  
The size of the field data cache is ~22G and there are zero evictions from  
this cache  
The size of the filter cache is ~28G and there are many evictions  
Is it normal having such large cache sizes? We think it affects our queries  
performance. On an empty cache a query latency is 2-3 minutes for the first  
run. Second run takes 10 seconds (and after some time again 2 min)  
Does it those 2-3 min take to Elastic to rebuild/refresh the caches? Why  
it's so long?  
Please help us to understand how Elastic creates filter cache and field  
data cache. When does Elastic create these caches and how does it affect  
the queries performance?

Thank you in advance,  
Vladi

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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, 12:24am UTC](https://discuss.elastic.co/t/filter-cache-and-field-data-caches/22857/2 "2017-07-06T00:24:29Z")

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