JingsongLi opened a new pull request #11496: [FLINK-16743][table] Introduce datagen, print, blackhole connectors URL: https://github.com/apache/flink/pull/11496 ## What is the purpose of the change Introduce built-in connectors for better startup, test, production-debug, and etc... 1.datagen source: - easy startup/test for streaming job - performance testing 2.print sink: - easy test for streaming job - be very useful in production debugging 3.blackhole sink - very useful for high performance testing of Flink - I've also run into users trying UDF to output, not sink, so they need this sink as well. ## Brief change log Introduce: - DataGeneratorSource - DataGenTableSourceFactory - PrintTableSinkFactory - BlackHoleTableSinkFactory ## Verifying this change - `DataGenTableSourceFactoryTest` - `TableSinkFactoryTest` - `DataGeneratorSourceTest` ## 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, Kubernetes/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) - If yes, how is the feature documented? (JavaDocs)
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