v7.5.5: introduce tidb_ddl_reorg_max_write_speed (#19668) (#19843)

pingcap · Dec 31, 2024 · 8c2ca56 · 8c2ca56
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diff --git a/releases/release-8.5.0.md b/releases/release-8.5.0.md
@@ -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-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-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
 

diff --git a/sql-statements/sql-statement-admin-alter-ddl.md b/sql-statements/sql-statement-admin-alter-ddl.md
@@ -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.
 

diff --git a/system-variables.md b/system-variables.md
@@ -1694,7 +1694,7 @@ 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