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v7.5.5: introduce tidb_ddl_reorg_max_write_speed #19668

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v7.5.5: introduce tidb_ddl_reorg_max_write_speed #19668

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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-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-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-variables.md
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Expand Up @@ -1695,7 +1695,7 @@ 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 v8.5.0</span>
### tidb_ddl_reorg_max_write_speed <span class="version-mark">New in v7.5.5 and v8.5.0</span>

- Scope: GLOBAL
- Persists to cluster: Yes
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