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ElasticSearch 分页查询及深度分页原理与实现

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By searchScroll Request.scroll, int sortNum, highLevel Client.clearScroll
| CSDN
查询流程 查询阶段 在初始化查询阶段(query phase)，查询被向索引中的每个分片副本(原本或副本)广播。每个分片在本地执行搜索并且建 立了匹配 document 的优先队列(priority queue)。 优先队列：一个优先队列(priority queue)只是一个存有前n个(top-n)匹配document的有序列表。这个优先队列的大小由分页参数 from + size 决定。 查询阶段 客户端发送一个 search(搜索) 请求给 Node 3 , Node 3 创建了一个长度为 from+size 的空优先级队列。 Node 3 转发(根据ID选择路由) 这个搜索请求到索引中每个分片的原本或副本。每个分片在本地执行这个查询并且将结果到一个大小为 from+size 的有序本地优先队列里去。 每个分片返回 document 的ID和它优先队列里的所有 document 的排序值给协调节点 Node 3 。Node 3 把这些值合并到自己的优先队列里产生全局排序结果。...
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