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                # Fielddata cache(列數據緩存) 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.3/modules-fielddata.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/modules-fielddata.html) 譯文鏈接 : [Fielddata cache(列數據緩存)](/pages/viewpage.action?pageId=9406419) 貢獻者 : [趙芳城](/display/~zhaofangcheng),[ApacheCN](/display/~apachecn),[Apache中文網](/display/~apachechina) (field date)列數據緩存主要用于對字段進行排序或計算聚合。 它將所有字段值加載到內存,以便為這些值提供快速的基于文檔的訪問。 (field date)列數據高速緩存對于一個字段的構建來說可能是昂貴的,所以它建議有足夠的內存分配它,并讓它持續保存在內存中。可以使用indices.fielddata.cache.size控制用于現(field date)列數據高速緩存的內存量。 注意:重新加載不適合您的緩存的字段數據將是昂貴的,并且性能不佳。 indices.fielddata.cache.size:列數據緩存的最大大小,例如節點堆空間的30%,或絕對值,例如12GB。 默認無限制。你也可以參考[“Field data circuit breaker](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/circuit-breaker.html#fielddata-circuit-breaker "Field data circuit breakeredit")[edit](https://github.com/elastic/elasticsearch/edit/5.3/docs/reference/modules/indices/circuit_breaker.asciidoc "Edit this page on GitHub")”. 提示 這些配置都是靜態的,你必須在集群的每個節點上都做配置。 ## Monitoring field data(監控列數據) 你可以通過?[Nodes Stats API](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/cluster-nodes-stats.html "Nodes Stats")?來監控fieldate內存和fielddata熔斷器的使用情況。
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