sunhaibotb opened a new pull request #8642: [FLINK-1722][datastream] Enable the InitializeOnMaster and FinalizeOnMaster interfaces on datastream URL: https://github.com/apache/flink/pull/8642 ## What is the purpose of the change This pull request enables the InitializeOnMaster and FinalizeOnMaster interfaces on datastream. The aim is to merge blink batch tables into master and move toward the goal of streaming-batch unification. ## Brief change log - Introduces a new class `InputOutputFormatVertex` (a derived class of JobVertex) to handle global initialization and finalization of `InputFormat(s)` and `OutputFormat(s)`. - Changes the logic that generates `JobGraph` from `StreamGraph`, and when a job vertex contains `InputFormat` or `OutputFormat`, create it with `InputOutputFormatVertex.` - Replaces all places where `InputFormatVertex` and `OutputFormatVertex `are used with `InputOutputFormatVertex`, and delete `InputFormatVertex` and `OutputFormatVertex`. ## Verifying this change This change added tests and can be verified as follows: - Extended test that validates the logic of `InputOutputFormatVertex`. - Extended test that checks if `InputOutputFormatVertex` is created correctly when a job contains `InputFormat` and `OutputFormat` on generating a job graph. - Added test for new `InputOutputFormatStub` class. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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