[GitHub] [incubator-doris] EmmyMiao87 commented on a change in pull request #5459: [Bucket Shuffle Join] Support the some featrue of Bucket Shuffle Join

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EmmyMiao87 commented on a change in pull request #5459:
URL: https://github.com/apache/incubator-doris/pull/5459#discussion_r587448251



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File path: docs/zh-CN/administrator-guide/bucket-shuffle-join.md
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+{
+    "title": "Bucket Shuffle Join",
+    "language": "zh-CN"
+}
+
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+-->
+
+# Bucket Shuffle Join
+
+Bucket Shuffle Join 是在 Doris 0.14 版本中正式加入的新功能。旨在为某些 Join 查询提供本地性优化，来减少数据在节点间的传输耗时，来加速查询。
+
+它的设计、实现和效果可以参阅 [ISSUE 4394](https://github.com/apache/incubator-doris/issues/4394)。
+
+## 名词解释
+
+* FE：Frontend，Doris 的前端节点。负责元数据管理和请求接入。
+* BE：Backend，Doris 的后端节点。负责查询执行和数据存储。
+* 左表：Join查询时，左边的表。进行Probe操作。可被Join Reorder调整顺序。
+* 右表：Join查询时，右边的表。进行Build操作。可被Join Reorder调整顺序。
+
+## 原理
+除了Bucket Shuffle Join, Doris 支持3种类型的join: `Shuffle Join, Broadcast Join, Colocate Join`。除了`Colocate Join`, 其他类型的join都会导致较大的网络和内存的开销。

Review comment:
       这句要不这么写？常规的分布式Join方式包括，shuffle join 和broadcast join。这两种join都会导致不小的网络开销。




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