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Merged
merged 6 commits into from
Oct 22, 2016
Merged

chapter43_part1: /404_Parent_Child/40_Parent_child.asciidoc #275

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0b74749
完成Parent-Child第1部分的翻译
Sep 11, 2016
181a79d
revise nested model name
Sep 11, 2016
8f44a6f
reisve pull request according to first inner team review
Sep 25, 2016
655eb6d
reisve pull request according to first inner team review
Sep 25, 2016
4bf0ce8
revise docvalue and maps
Sep 25, 2016
b9172c1
revise 1 to 一
Sep 26, 2016
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revise docvalue and maps
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weiqiang.yuan committed Sep 25, 2016
commit 4bf0ce85c591e6ef946737540938a4806bb0c430
4 changes: 1 addition & 3 deletions 404_Parent_Child/40_Parent_child.asciidoc
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Elasticsearch 维护了一个父文档和子文档的映射关系，得益于这个映射，父-子文档关联查询操作非常快。但是这个映射也对父-子文档关系有个限制条件：父文档和其所有子文档，都必须要存储在同一个分片中。

父-子文档ID映射存储在 <<docvalues>> 中。通过 <<docvalues>>，可以将热点查询的 ID maps 维护在内存中；当 ID maps 变得非常大时，还可以将其扩展加载到硬盘中。


父-子文档ID映射存储在 <<docvalues>> 中。当映射完全在内存中时， <<docvalues>> 提供对映射的快速处理能力，另一方面当映射非常大时，可以通过溢出到磁盘提供足够的扩展能力

[[parent-child-mapping]]
=== 父-子关系文档映射
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