restore: adapt the new `SplitAndScatter` API
Open
type/enhancement
- Dominant language
- Go
- Stars
- 40.5k
- Forks
- 6.2k
- PR merge metrics
- PR metrics pending
Description
## Enhancement
Now, PD provides a new API `SplitAndScatter`, which allows us to finish split & scatter in one RPC. This can help us preventing some problems caused by scattering a region more than once.
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