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ES学习笔记之-AvgAggregation的实现过程分析-每天进步一点点
source link: http://blog.51cto.com/sbp810050504/2324922
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我们需要查看数据的统计量时，均值是最重要的特征之一。对于海量数据，这类简单的聚合ES可以做到秒级别返回。聚合是ES的特色功能。那么ES是如何实现这一功能的呢？我们知道，ES的数据存储在各个节点中，所以ES的实现AvgAggregation时基本思路就是先统计各个节点，然后汇总。先了解ES是如何统计单个节点:参考AvgAggregator@OverridepublicLeafBucketCollec
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