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tidb_ddl_reorg_max_write_speed: add the support info of v6.5.12 #20359

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tidb_ddl_reorg_max_write_speed: add the support info of v6.5.12 #20359

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Add temp.md
qiancai Feb 24, 2025
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Update system-variables.md
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qiancai Feb 25, 2025
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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 @@ Compared with the previous LTS 8.1.0, 8.5.0 includes new features, improvements,
| Variable name | Change type | Description |
|--------|------------------------------|------|
| [`tidb_enable_fast_create_table`](/system-variables.md#tidb_enable_fast_create_table-new-in-v800) | Modified | Changes the default value from `OFF` to `ON` after further tests, meaning that the [accelerated table creation](/accelerated-table-creation.md) feature is enabled by default. |
| [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v755-and-v850) | Newly added | Limits the write bandwidth for each TiKV node and only takes effect when index creation acceleration is enabled (controlled by the [`tidb_ddl_enable_fast_reorg`](/system-variables.md#tidb_ddl_enable_fast_reorg-new-in-v630) variable). For example, setting the variable to `200MiB` limits the maximum write speed to 200 MiB/s. |
| [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v6512-v755-and-v850) | Newly added | Limits the write bandwidth for each TiKV node and only takes effect when index creation acceleration is enabled (controlled by the [`tidb_ddl_enable_fast_reorg`](/system-variables.md#tidb_ddl_enable_fast_reorg-new-in-v630) variable). For example, setting the variable to `200MiB` limits the maximum write speed to 200 MiB/s. |

### Configuration parameters

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2 changes: 1 addition & 1 deletion sql-statements/sql-statement-admin-alter-ddl.md
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Expand Up @@ -23,7 +23,7 @@ The following are the supported parameters for different DDL jobs and their corr
- `ADD INDEX`:
- `THREAD`: the concurrency of the DDL job. The initial value is set by `tidb_ddl_reorg_worker_cnt`.
- `BATCH_SIZE`: the batch size. The initial value is set by [`tidb_ddl_reorg_batch_size`](/system-variables.md#tidb_ddl_reorg_batch_size).
- `MAX_WRITE_SPEED`: the maximum bandwidth limit for importing index records into each TiKV. The initial value is set by [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v755-and-v850).
- `MAX_WRITE_SPEED`: the maximum bandwidth limit for importing index records into each TiKV. The initial value is set by [`tidb_ddl_reorg_max_write_speed`](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v6512-v755-and-v850).

Currently, the preceding parameters only work for `ADD INDEX` jobs that are submitted and running after [`tidb_enable_dist_task`](/system-variables.md#tidb_enable_dist_task-new-in-v710) is disabled.

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2 changes: 1 addition & 1 deletion system-variable-reference.md
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Expand Up @@ -1206,7 +1206,7 @@ Referenced in:

- [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)
- [System Variables](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v755-and-v850)
- [System Variables](/system-variables.md#tidb_ddl_reorg_max_write_speed-new-in-v6512-v755-and-v850)
- [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 @@ -1705,7 +1705,7 @@ mysql> SELECT job_info FROM mysql.analyze_jobs ORDER BY end_time DESC LIMIT 1;
- This variable is used to set the priority of executing the `ADD INDEX` operation in the `re-organize` phase.
- You can set the value of this variable to `PRIORITY_LOW`, `PRIORITY_NORMAL` or `PRIORITY_HIGH`.

### tidb_ddl_reorg_max_write_speed <span class="version-mark">New in v7.5.5 and v8.5.0</span>
### tidb_ddl_reorg_max_write_speed <span class="version-mark">New in v6.5.12, v7.5.5, and v8.5.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
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