Flink 系例 之 SideOutput

SideOutput方法：（侧输出）从主数据流中根据outputTag获取额外的输出流（分流场景下使用）

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

SideOutput.java

import com.flink.examples.DataSource;
import org.apache.flink.api.java.tuple.Tuple3;
import org.apache.flink.api.java.tuple.Tuple4;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.ProcessFunction;
import org.apache.flink.util.Collector;
import org.apache.flink.util.OutputTag;

import java.util.List;


public class SideOutput {
    
    public static void main(String[] args) throws Exception {
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        List> tuple3List = DataSource.getTuple3ToList();
        //Datastream
        DataStream> dataStream = env.fromCollection(tuple3List);
        //自定义man和girl两个性别tag
        OutputTag> manTag = new OutputTag>("man"){};
        OutputTag> girlTag = new OutputTag>("girl"){};
        //将所有流数据输入到process做处理
        SingleOutputStreamOperator> output = dataStream.process(new ProcessFunction, Tuple4>() {
            @Override
            public void processElement(Tuple3 value, Context ctx, Collector> out) throws Exception {
                //将数据流按不同的性别划分，创建新的Tuple4，分别绑定到不同性别的tag
                if (value.f1.equals("man")){
                    ctx.output(manTag, Tuple4.of(value.f0, value.f1, value.f2, "男"));
                }else {
                    ctx.output(girlTag, Tuple4.of(value.f0, value.f1, value.f2, "女"));
                }
            }
        });
        //获取指定tag的数据流
        DataStream> dataStream1 = output.getSideOutput(manTag);
        DataStream> dataStream2 = output.getSideOutput(girlTag);
        //打印
        dataStream1.print();
        dataStream2.print();
        env.execute("flink Split job");
    }
}

打印结果

(张三,man,20,男)
(李四,girl,24,女)
(王五,man,29,男)
(刘六,girl,32,女)
(伍七,girl,18,女)
(吴八,man,30,男)