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Update 4.storage-service.md #1744

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Apr 28, 2022
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Update 4.storage-service.md #1744

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2 changes: 1 addition & 1 deletion docs-2.0/1.introduction/3.nebula-graph-architecture/4.storage-service.md
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Expand Up @@ -139,7 +139,7 @@ EdgeA_Out 和 EdgeA_In 以方向相反的两条边的形式存在于存储层，
如 EdgeA_Out 和 EdgeA_In 一样，Nebula Graph 冗余了存储每条边的信息，导致存储边所需的实际空间翻倍。因为边对应的 key 占用的硬盘空间较小，但 value 占用的空间与属性值的长度和数量成正比，所以，当边的属性值较大或数量较多时候，硬盘空间占用量会比较大。

如果对边进行操作，为了保证两个键值对的最终一致性，可以开启 [TOSS 功能](../../5.configurations-and-logs/1.configurations/3.graph-config.md)，开启后，会先在正向边所在的分片进行操作，然后在反向边所在分片进行操作，最后返回结果。
-->

### 分片算法

分片策略采用**静态 Hash **的方式，即对点 VID 进行取模操作，同一个点的所有 Tag、出边和入边信息都会存储到同一个分片，这种方式极大地提升了查询效率。
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