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这篇文章主要讲解了“Flink的Split怎么使用”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“Flink的Split怎么使用”吧!
Split算子:将数据流切分成多个数据流(已过时,并且不能二次切分,不建议使用)
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
Split.java
package com.flink.examples.functions; import com.flink.examples.DataSource; import org.apache.flink.api.common.functions.MapFunction; import org.apache.flink.api.java.tuple.Tuple3; import org.apache.flink.api.java.tuple.Tuple4; import org.apache.flink.streaming.api.collector.selector.OutputSelector; import org.apache.flink.streaming.api.datastream.DataStream; import org.apache.flink.streaming.api.datastream.SplitStream; import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment; import java.util.ArrayList; import java.util.List; /** * @Description Split算子:将数据流切分成多个数据流(已过时,并且不能二次切分,不建议使用) */ public class Split { /** * 遍历集合,将数据流切分成多个流并打印 * @param args * @throws Exception */ public static void main(String[] args) throws Exception { final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(); env.setParallelism(1); List<Tuple3<String, String, Integer>> tuple3List = DataSource.getTuple3ToList(); //Datastream DataStream<Tuple3<String, String, Integer>> dataStream = env.fromCollection(tuple3List); //按性别进行拆分 //flink.1.11.1显示SplitStream类过时,推荐用keyBy的方式进行窗口处理或SideOutput侧输出流处理;注意,使用split切分后的流,不可二次切分,否则会抛异常 SplitStream<Tuple3<String, String, Integer>> split = dataStream.split(new OutputSelector<Tuple3<String, String, Integer>>() { @Override public Iterable<String> select(Tuple3<String, String, Integer> value) { List<String> output = new ArrayList<String>(); if (value.f1.equals("man")) { output.add("man"); } else { output.add("girl"); } return output; } }); //查询指定名称的数据流 DataStream<Tuple4<String, String, Integer, String>> dataStream1 = split.select("man") .map(new MapFunction<Tuple3<String, String, Integer>, Tuple4<String, String, Integer, String>>() { @Override public Tuple4<String, String, Integer, String> map(Tuple3<String, String, Integer> t3) throws Exception { return Tuple4.of(t3.f0, t3.f1, t3.f2, "男"); } }); DataStream<Tuple4<String, String, Integer, String>> dataStream2 = split.select("girl") .map(new MapFunction<Tuple3<String, String, Integer>, Tuple4<String, String, Integer, String>>() { @Override public Tuple4<String, String, Integer, String> map(Tuple3<String, String, Integer> t3) throws Exception { return Tuple4.of(t3.f0, t3.f1, t3.f2, "女"); } }); //打印:男 dataStream1.print(); //打印:女 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)
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