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FLIP-176: Unified Iteration to Support Algorithms has introduced a unified iteration library in the flink-ml Flink ML repository. This library addresses all the issues present in the Iteration API of DataStream and could provide solution for all the iteration use-cases. However, maintaining two separate implementations of iteration in both the Flink repository and the Flink -ml ML repository would introduce unnecessary complexity and make it difficult to maintain the Iteration API.

We propose deprecating the Iteration API of DataStream and removing it completely before Flink 2.0. If other modules In the future, if other modules in the Flink repository require the use of the Iteration API in the future, we can consider extracting all Iteration implementations from the flink-ml Flink ML repository into an independent module.

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