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tidb_ddl_reorg_max_write_speed: add the support info of v6.5.12 #19897

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tidb_ddl_reorg_max_write_speed: add the support info of v6.5.12 #19897

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Update system-variables.md
qiancai Feb 24, 2025
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fix broken links
qiancai Feb 24, 2025
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fix link errors
qiancai Feb 24, 2025
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Discard changes to releases/release-7.5.5.md
qiancai Feb 25, 2025
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2 changes: 1 addition & 1 deletion releases/release-7.5.5.md
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Expand Up @@ -13,7 +13,7 @@ TiDB 版本：7.5.5

## 兼容性变更

- 新增系统变量 [`tidb_ddl_reorg_max_write_speed`](https://docs.pingcap.com/zh/tidb/v7.5/system-variables#tidb_ddl_reorg_max_write_speed-从-v755-版本开始引入)，用于限制加索引时 ingest 阶段速度的上限 [#57156](https://github.com/pingcap/tidb/issues/57156) @[CbcWestwolf](https://github.com/CbcWestwolf)
- 新增系统变量 [`tidb_ddl_reorg_max_write_speed`](https://docs.pingcap.com/zh/tidb/v7.5/system-variables#tidb_ddl_reorg_max_write_speed-从-v6512-和-v755-版本开始引入)，用于限制加索引时 ingest 阶段速度的上限 [#57156](https://github.com/pingcap/tidb/issues/57156) @[CbcWestwolf](https://github.com/CbcWestwolf)
- TiKV 配置项 [`raft-client-queue-size`](/tikv-configuration-file.md#raft-client-queue-size) 默认值从 `8192` 修改为 `16384` [#17101](https://github.com/tikv/tikv/issues/17101) @[Connor1996](https://github.com/Connor1996)

## 改进提升
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2 changes: 1 addition & 1 deletion releases/release-8.5.0.md
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Expand Up @@ -228,7 +228,7 @@ TiDB 8.5.0 为长期支持版本 (Long-Term Support Release, LTS)。
| 变量名 | 修改类型 | 描述 |
|--------|------------------------------|------|
| [`tidb_enable_fast_create_table`](/system-variables.md#tidb_enable_fast_create_table-从-v800-版本开始引入) | 修改 | 经进一步的测试后，默认值从 `OFF` 修改为 `ON`，即默认开启 [TiDB 加速建表](/accelerated-table-creation.md)。|
| [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v755-和-v850-版本开始引入) | 新增 | 限制每个 TiKV 节点写入的带宽，仅在开启添加索引加速功能时生效（由变量 [`tidb_ddl_enable_fast_reorg`](/system-variables.md#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入) 控制）。例如，当该值设置为 `200MiB` 时，最大写入速度限制为 200 MiB/s。 |
| [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v6512-v755-和-v850-版本开始引入) | 新增 | 限制每个 TiKV 节点写入的带宽，仅在开启添加索引加速功能时生效（由变量 [`tidb_ddl_enable_fast_reorg`](/system-variables.md#tidb_ddl_enable_fast_reorg-从-v630-版本开始引入) 控制）。例如，当该值设置为 `200MiB` 时，最大写入速度限制为 200 MiB/s。 |

### 配置参数

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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-admin-alter-ddl.md
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Expand Up @@ -25,7 +25,7 @@ ADMIN ALTER DDL JOBS 101 THREAD = 8;
- `ADD INDEX`：
- `THREAD`：并发度，初始值由系统变量 `tidb_ddl_reorg_worker_cnt` 设置。
- `BATCH_SIZE`：批大小，初始值由系统变量 [`tidb_ddl_reorg_batch_size`](/system-variables.md#tidb_ddl_reorg_batch_size) 设置。
- `MAX_WRITE_SPEED`：向每个 TiKV 导入索引记录时的最大带宽限制，初始值由系统变量 [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v755-和-v850-版本开始引入) 设置。
- `MAX_WRITE_SPEED`：向每个 TiKV 导入索引记录时的最大带宽限制，初始值由系统变量 [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v6512-v755-和-v850-版本开始引入) 设置。

以上设置，当前仅对关闭 [`tidb_enable_dist_task`](/system-variables.md#tidb_enable_dist_task-从-v710-版本开始引入) 后，提交并运行中的 `ADD INDEX` 的作业生效。

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2 changes: 1 addition & 1 deletion system-variable-reference.md
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Expand Up @@ -1183,7 +1183,7 @@ summary: 查看 TiDB 所有的系统变量，以及引用这些变量的文档

- [ADMIN ALTER DDL JOBS](/sql-statements/sql-statement-admin-alter-ddl.md)
- [ADMIN SHOW DDL [JOBS|JOB QUERIES]](/sql-statements/sql-statement-admin-show-ddl.md)
- [系统变量](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v755-和-v850-版本开始引入)
- [系统变量](/system-variables.md#tidb_ddl_reorg_max_write_speed-从-v6512-v755-和-v850-版本开始引入)
- [TiDB 8.5.0 Release Notes](/releases/release-8.5.0.md)
- [TiDB 7.5.5 Release Notes](/releases/release-7.5.5.md)

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2 changes: 1 addition & 1 deletion system-variables.md
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Expand Up @@ -1516,7 +1516,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- 可选值：`PRIORITY_LOW`、`PRIORITY_NORMAL`、`PRIORITY_HIGH`
- 这个变量用来设置 `ADD INDEX` 操作 `re-organize` 阶段的执行优先级，可设置为 `PRIORITY_LOW`/`PRIORITY_NORMAL`/`PRIORITY_HIGH`。

### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">从 v7.5.5 和 v8.5.0 版本开始引入</span>
### `tidb_ddl_reorg_max_write_speed` <span class="version-mark">从 v6.5.12、v7.5.5 和 v8.5.0 版本开始引入</span>

- 作用域：GLOBAL
- 是否持久化到集群：是
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