# Doubts about Field-data cache
**URL:** https://discuss.elastic.co/t/doubts-about-field-data-cache/74481
**Category:** Elasticsearch
**Created:** [February 9, 2017, 10:04am UTC](https://discuss.elastic.co/t/doubts-about-field-data-cache/74481 "2017-02-09T10:04:39Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@Balamurali](https://discuss.elastic.co/u/Balamurali)
#### Post date: [February 9, 2017, 10:04am UTC](https://discuss.elastic.co/t/doubts-about-field-data-cache/74481/1 "2017-02-09T10:04:39Z")
Hi all,
some doubts about caches
(i)as default ,field data cache has 30% of heap space and breaker limit is 60% of heap size.
how come field data cache (30%) can accept request of 59% data of heap space (more than 60 % is limit).????????
(ii) if field data cache is larger than cache size , what will happen if aggregation happens?
FYI , we are using ES 1.3.7 cluster
can you all please help us!!!
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### Author:  [@Balamurali](https://discuss.elastic.co/u/Balamurali)
#### Post date: [February 10, 2017, 6:59am UTC](https://discuss.elastic.co/t/doubts-about-field-data-cache/74481/2 "2017-02-10T06:59:35Z")
can anybody help us
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### Author:  [@warkolm](https://discuss.elastic.co/u/warkolm)
#### Post date: [February 13, 2017, 8:44am UTC](https://discuss.elastic.co/t/doubts-about-field-data-cache/74481/3 "2017-02-13T08:44:09Z")
1. It means by default it'll use 30%, but may take up to 60%.
2. It'll fail.
> [@Balamurali](#):
>
> FYI , we are using ES 1.3.7 cluster
Upgrade! 😃
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### Author:  [@Balamurali](https://discuss.elastic.co/u/Balamurali)
#### Post date: [February 13, 2017, 9:00am UTC](https://discuss.elastic.co/t/doubts-about-field-data-cache/74481/4 "2017-02-13T09:00:56Z")
thanks much @warkolm
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### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [March 13, 2017, 9:01am UTC](https://discuss.elastic.co/t/doubts-about-field-data-cache/74481/5 "2017-03-13T09:01:37Z")
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