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Add description of --overwrite-checkpoint-ts for changefeed resume #9796

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Aug 10, 2022
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Add description of --overwrite-checkpoint-ts for changefeed resume #9796

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overwrite checkpiont ts
ran-huang Aug 2, 2022
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Update ticdc/manage-ticdc.md
ran-huang Aug 3, 2022
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9 changes: 7 additions & 2 deletions ticdc/manage-ticdc.md
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Expand Up @@ -522,9 +522,14 @@ Execute the following command to resume a paused replication task:
cdc cli changefeed resume --pd=http://10.0.10.25:2379 --changefeed-id simple-replication-task
```

In the above command:

- `--changefeed-id=uuid` represents the ID of the `changefeed` that corresponds to the replication task you want to resume.
- `--overwrite-checkpoint-ts`: starting from v6.2.0, you can specify the starting TSO of resuming the replication task. TiCDC starts pulling data from the specified TSO. The argument accepts `now` or a specific TSO (such as 434873584621453313). The specified TSO must be (GC safe point, CurrentTSO]. If this argument is not specified, TiCDC replicates data from the current `checkpoint-ts` by default.
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- `--no-confirm`: when the replication is resumed, you do not need to confirm the related information. Defaults to `false`.

> **Note:**
>
> - If the TSO specified in `--overwrite-checkpoint-ts` (`t2`) is larger than the current checkpoint TSO in the changefeed (`t1`), data between `t1` and `t2` will not be replicated to the downstream. This causes data loss. You can obtain `t1` by running `cdc cli changefeed query`.
> - If the TSO specified in `--overwrite-checkpoint-ts` (`t2`) is smaller than the current checkpoint TSO in the changefeed (`t1`), TiCDC pulls data from an old time point (`t2`), which might cause data duplication (for example, if the downstream is MQ sink).

#### Remove a replication task

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