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Highlight TiFlash does not support Lightning in TiFlash section #5122

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Highlight TiFlash does not support Lightning in TiFlash section #5122

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28 changes: 13 additions & 15 deletions tiflash/use-tiflash.md
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Expand Up @@ -44,21 +44,19 @@ Delete the replica:
ALTER TABLE `tpch50`.`lineitem` SET TIFLASH REPLICA 0
```

**Notes:**

* If the table `t` is replicated to TiFlash through the above DDL statements, the table created using the following statement will also be automatically replicated to TiFlash:

{{< copyable "sql" >}}

```sql
CREATE TABLE table_name like t
```

* For versions earlier than v4.0.6, if you create the TiFlash replica before using TiDB Lightning to import the data, the data import will fail. You must import data to the table before creating the TiFlash replica for the table.

* If TiDB and TiDB Lightning are both v4.0.6 or later, no matter a table has TiFlash replica(s) or not, you can import data to that table using TiDB Lightning. Note that this might slow the TiDB Lightning procedure, which depends on the NIC bandwidth on the lightning host, the CPU and disk load of the TiFlash node, and the number of TiFlash replicas.

* It is recommended that you do not replicate more than 1,000 tables because this lowers the PD scheduling performance. This limit will be removed in later versions.
> **Notes:**
>
> * If the table `t` is replicated to TiFlash through the above DDL statements, the table created using the following statement will also be automatically replicated to TiFlash:
> {{< copyable "sql" >}}
>
> ```sql
> CREATE TABLE table_name like t
> ```
>
> * For versions earlier than v4.0.6, if you create the TiFlash replica before using TiDB Lightning to import the data, the data import will fail. You must import data to the table before creating the TiFlash replica for the table.
> * If TiDB and TiDB Lightning are both v4.0.6 or later, no matter a table has TiFlash replica(s) or not, you can import data to that table using TiDB Lightning. Note that this might slow the TiDB Lightning procedure, which depends on the NIC bandwidth on the lightning host, the CPU and disk load of the TiFlash node, and the number of TiFlash replicas.
> * It is recommended that you do not replicate more than 1,000 tables because this lowers the PD scheduling performance. This limit will be removed in later versions.
> * TiDB Lightning does not support importing data into tables with TiFlash replicas. Make sure to remove all TiFlash replcas before importing data. You can add TiFlash replicas back after import is finished.

## Check the replication progress

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