Flink 系例 之 Union

Flink 系例 之 Union

Union算子：将多个数据流合并成一个新的数据流（数据类型必需一致）

示例环境、

java.version: 1.8.x
flink.version: 1.11.1

示例数据源 （项目码云下载）

Flink 系例 之 搭建开发环境与数据

Union.java

import com.flink.examples.DataSource;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import java.util.List;


public class Union {

    
    public static void main(String[] args) throws Exception {
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        List> tuple3List = DataSource.getTuple3ToList();
        //Datastream 1
        DataStream> dataStream1 = env.fromCollection(tuple3List);
        //Datastream 2
        DataStream> dataStream2 = env.fromCollection(tuple3List);
        //Datastream 3
        DataStream> dataStream = dataStream1.union(dataStream2);
        dataStream.print();
        env.execute("flink Union job");
    }

}

 打印结果

3> (王五,man,29)
2> (李四,girl,24)
3> (王五,man,29)
1> (张三,man,20)
1> (张三,man,20)
1> (伍七,girl,18)
1> (伍七,girl,18)
2> (吴八,man,30)
2> (李四,girl,24)
2> (吴八,man,30)
4> (刘六,girl,32)
4> (刘六,girl,32)