hailin0 opened a new pull request #4270:
URL: https://github.com/apache/incubator-dolphinscheduler/pull/4270
## What is the purpose of the pull request
- Refactor code to support tracing
## Brief change log
- Extension network protocol, support context and version
- Extension master asynchronous queue support context
- Extract scan task method from MasterSchedulerService for tracing
## Verify this pull request
This change added tests and can be verified as follows:
- *Update Test case to verify the change.*
- *Manually verified the change by testing locally.*
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