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

weiqiangyuan · 2016-09-11T10:23:32Z

No description provided.

cdma · 2016-09-20T08:03:28Z

404_Parent_Child/40_Parent_child.asciidoc

-within the same document while, with parent-child, the parent and children
-are completely separate documents.
+父-子关系文档((("relationships", "parent-child")))((("parent-child relationship")))和
+ <<nested-objects,nested model>> 有一个相似点：允许将一个对象实体和另外一个对象实体关联起来。((("nested objects", "parent-child relationships versus")))而这两种类型的主要区别是：在 在 <<nested-objects,`nested` objects>> 文档中，所有对象都是在同一个文档中，而在父-子关系文档中，父对象和子对象都是完全独立的文档。


建议：1. 改成在实质上类似于xxx
2. (((这种符号好像都要留空格

ok, 按照给出的建议修改

cdma · 2016-09-20T08:06:03Z

404_Parent_Child/40_Parent_child.asciidoc

-The parent-child functionality allows you to associate one document type with
-another, in a _one-to-many_ relationship--one parent to many children.((("one-to-many relationships")))   The
-advantages that parent-child has over <<nested-objects,`nested` objects>> are as follows:
+父-子关系的主要作用是允许把一个 type 的文档和另外一个 type 的文档关联起来，构成1对n的关系：一个父文档可以对应多个子文档((("one-to-many relationships")))。与 <<nested-objects,`nested` objects>> 相比，父-子关系的主要优势有：


建议：1. 这里document就是指type，翻译中去掉type的
2. 一对多的关系
3. 格式符号都要留空格

关于第一条，我觉得type保留下来，能够更加清楚地说明P-C是关联不同type类型的文档（而不是用来关联同一个type下的不同文档）。
第2、3条按照建议修改。

可能一对多更好，当然1对多也看得懂

cdma · 2016-09-20T08:13:01Z

404_Parent_Child/40_Parent_child.asciidoc

-* The parent document can be updated without reindexing the children.
+* 更新父文档时，不会重新索引子文档。
+* 创建，修改或删除子文档时，不会影响父文档和其他子文档。这一点在这种场景下尤其有用：子文档数量较多，并且子文档创建和修改的频率高时。
+* 子文档可以作为搜索结果，独立返回。


父文档或其他子文档
子文档可以作为搜索结果独立返回（不要逗号）

按照给出的建议修改

cdma · 2016-09-20T08:29:58Z

404_Parent_Child/40_Parent_child.asciidoc

-* Child documents can be added, changed, or deleted without affecting either
-  the parent or other children. This is especially useful when child documents
-  are large in number and need to be added or changed frequently.
+Elasticsearch 维护了一个父文档和子文档的映射关系——ID maps，实现了快速的父-子文档查询操作。但是，有一点需要指出：父文档和其所有子文档，都必须要存储在同一个分片中。


建议：1. 去掉——ID maps
2. 得益于这个映射，父-子文档关联查询操作非常快
3. 但是这个映射也对父-子文档关系有个限制条件

按照给出的建议修改

cdma · 2016-09-20T08:49:37Z

404_Parent_Child/40_Parent_child.asciidoc


-* Child documents can be returned as the results of a search request.
+ID maps 维护在 <<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。


建议：

父-子文档ID映射存储在

which allows them to execute quickly when fully hot in memory这句我也没有好的翻译方法，建议请教下其他人

第1个建议按照要求修改。第2个在请教中

cdma · 2016-09-20T09:18:41Z

404_Parent_Child/40_Parent_child.asciidoc



 [[parent-child-mapping]]
-=== Parent-Child Mapping
+=== 父-子映射


父-子文档映射

按照给出的建议修改

cdma · 2016-09-20T09:24:29Z

404_Parent_Child/40_Parent_child.asciidoc

-specify which document type should be the parent of a child type.((("mapping (types)", "parent-child")))((("parent-child relationship", "parent-child mapping")))  This must
-be done at index creation time, or with the `update-mapping` API before the
-child type has been created.
+建立父-子映射关系时需要指定某一个文档 type 是另一个文档 type 的父亲。((("mapping (types)", "parent-child")))((("parent-child relationship", "parent-child mapping")))该关系可以在如下两个时间点设置：1）创建索引时；2）在子文档的 type 创建之前，通过更新父文档的 mapping。


1.只需要
2. update-mapping API不要翻译

按照给出的建议修改

cdma · 2016-09-20T09:30:31Z

404_Parent_Child/40_Parent_child.asciidoc

-use <<application-joins,application-side-joins>> or
-<<denormalization,data denormalization>> here instead, but for demonstration
-purposes we will use parent-child.
+举例说明，有一个公司在多个城市有分公司，并且每一个分公司下面都有很多员工。有这样的需求：按照分公司、员工的维度去搜索，并且搜索某些特定分公司下的员工。针对该需求，用嵌套模型是无法实现的。当然，如果使用 <<application-joins,application-side-joins>> 或者 <<denormalization,data denormalization>> 也是可以实现的。


我们想把员工和他们工作的分公司联系起来

cdma · 2016-09-20T09:33:51Z

404_Parent_Child/40_Parent_child.asciidoc

-All that we have to do is to tell Elasticsearch that the `employee` type has
-the `branch` document type as its `_parent`, which we can do when we create
-the index:
+在这里我们使用父-子文档，首先需要父子文档的映射关系，我们在创建员工 `employee` 文档 type 时，指定分公司 `branch` 的文档 type 为其父亲。


但是为了演示的目的

我们需要告诉Elasticsearch

cdma · 2016-09-26T13:27:01Z

LGTM

medcl · 2016-10-21T07:42:50Z

LGTM

…earch-cn#275) * 完成Parent-Child第1部分的翻译 * revise nested model name * reisve pull request according to first inner team review * reisve pull request according to first inner team review * revise docvalue and maps * revise 1 to 一

weiqiang.yuan added 2 commits September 11, 2016 18:04

完成Parent-Child第1部分的翻译

0b74749

revise nested model name

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cdma reviewed Sep 20, 2016

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luotitan added the to be improve label Sep 21, 2016

weiqiang.yuan added 4 commits September 25, 2016 16:41

reisve pull request according to first inner team review

8f44a6f

reisve pull request according to first inner team review

655eb6d

revise docvalue and maps

4bf0ce8

revise 1 to 一

b9172c1

cdma added to be final review and removed to be improve labels Oct 10, 2016

medcl added to be merge and removed to be final review labels Oct 21, 2016

medcl merged commit e42e492 into elasticsearch-cn:cn Oct 22, 2016

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

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

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cdma commented Sep 26, 2016

medcl commented Oct 21, 2016


		* Child documents can be returned as the results of a search request.
		ID maps 维护在 <<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。

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

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

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weiqiangyuan commented Sep 11, 2016

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cdma commented Sep 26, 2016

medcl commented Oct 21, 2016

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