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Clarify Local-backend in tidb-lightning-backends.md (#6006) #6022

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Clarify Local-backend in tidb-lightning-backends.md (#6006) #6022

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2 changes: 1 addition & 1 deletion tidb-lightning/tidb-lightning-backends.md
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Expand Up @@ -15,7 +15,7 @@ TiDB Lightning 的[后端](/tidb-lightning/tidb-lightning-glossary.md#backend)

* **Importer-backend**：`tidb-lightning` 先将 SQL 或 CSV 数据编码成键值对，由 `tikv-importer` 对写入的键值对进行排序，然后把这些键值对 Ingest 到 TiKV 节点中。

* **Local-backend**：`tidb-lightning` 先将数据编码成键值对并排序存储在本地临时目录，然后批量将这些键值对写到各个 TiKV 节点，然后由 TiKV 将它们 Ingest 到集群中。和 `Importer-backend` 原理相同，不过不依赖额外的 `tikv-importer` 组件。
* **Local-backend**：`tidb-lightning` 先将数据编码成键值对并排序存储在本地临时目录，然后将这些键值对以 SST 文件的形式上传到各个 TiKV 节点，然后由 TiKV 将这些 SST 文件 Ingest 到集群中。和 `Importer-backend` 原理相同，不过不依赖额外的 `tikv-importer` 组件。

* **TiDB-backend**：`tidb-lightning` 先将数据编码成 `INSERT` 语句，然后直接在 TiDB 节点上运行这些 SQL 语句进行数据导入。

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