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tidb: add description for var tidb_ddl_reorg_max_write_speed #19445

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tidb: add description for var tidb_ddl_reorg_max_write_speed #19445

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tidb: add description for var tidb_ddl_reorg_max_write_speed
CbcWestwolf Nov 18, 2024
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11 changes: 11 additions & 0 deletions system-variables.md
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Expand Up @@ -1699,6 +1699,17 @@ 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 v8.5.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
- Applies to hint [SET_VAR](/optimizer-hints.md#set_varvar_namevar_value): No
- Type: Integer
- Default value: `0`
- Range: `[0, 1125899906842624]` (the maximum value that can be set is 1 PiB)
- This variable 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`](#tidb_ddl_enable_fast_reorg-new-in-v630) variable). When the data size in your cluster is quite large (such as billions of rows), limiting the write bandwidth for index creation can effectively reduce the impact on application workloads.
- The default value `0` means no write bandwidth limit. The default unit is bytes per second. You can also set the value in formats such as `'1GiB'` or `'256MiB'`.

### tidb_ddl_reorg_worker_cnt

> **Note:**
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