Drug discovery

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Specifying KeysSome transformations (join, coGroup, keyBy, groupBy) require that a key be defined on a collection of elements. Other transformations (Reduce, GroupReduce, Aggregate, Windows) allow data being grouped on a key before they are applied.A Dat

All Flink programs are executed lazily: When the program’s main method is executed, the data loading and transformations do not happen directly. Rather, each operation is created and added to the program’s plan. The operations are actually executed when th

Flink program consists of the same basic parts:1.Obtain an execution environment,获取执行环境2.Load/create the initial data,获取数据3.Specify transformations on this data,指定数据转换4.Specify where to put the results of your computations,指定数据sink到哪里5.Trigger the pro

Flink has the special classes DataSet and DataStream to represent data in a program. You can think of them as immutable(不可变的) collections of data that can contain duplicates(可以重复).In the case of DataSet the data is finite(对于DataSet 数据是有界的,批处理使用)while for