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As the first sub-FLIP for DataStream API V2, we'd like to discuss and try to answer some of the most fundamental questions in stream processing.

  1. What kinds of data streams do we have?
  2. How to partition data over the streams?
  3. How to define a processing on the data stream?

The answer to these questions involve three core concepts: DataStream, Partitioning and ProcessFunction. In this FLIP, we will discuss the definitions and related API primitives of these concepts in detail.

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