yangyichao-mango opened a new pull request #3417:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/3417
## What is the purpose of the pull request
*Introduce users service interface for clear code*
## Brief change log
- *Add `UserServiceImpl` and change `UserService` to interface*
## Verify this pull request
This pull request is already covered by existing tests, such as *(please
describe tests)*.
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