flink之keyby groupby區別

之前學習spark 的時候對rdd和ds經常用的groupby操作，在flink中居然變少了 取而代之的是keyby 顧名思義，keyby是根據key的hashcode對分區數取模   For instance, if we know that the load of the parallel partitions of a DataStream is skewed, we might want

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