THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Motivation
As discussed in FLIP-131, Flink will deprecate the DataSet API in favor of DataStream API and Table API. Users should be able to use DataStream API to write jobs that support both bounded and unbounded execution modes. However Flink does not provide a sink API to guarantee the exactly once semantics in both bounded and unbounded scenarios, which blocks the unification.
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