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Introduction
The DataStream API is one of the two main APIs that Flink provides for writing data processing programs. As an API that was introduced practically since day-1 of the project and has been evolved for nearly a decade, we are observing more and more problems of it. Improvements on these problems require significant breaking changes, which makes in-place refactor impractical. Therefore, we propose to introduce a new set of APIs, the DataStream API V2, to gradually replace the original DataStream API.
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