PartitionCustom

package com.atguigu.partition;

import org.apache.flink.api.java.functions.KeySelector;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.DataStreamSource;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;

public class PartitionCustomDemo {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment.createLocalEnvironmentWithWebUI(new Configuration());
        env.setParallelism(2);

        DataStreamSource<String> socketDS = env.socketTextStream("192.168.1.7", 9091);

        socketDS
                .partitionCustom(new MyPartitioner(), r->r)
                .print();

        env.execute();
    }
}

package com.atguigu.partition;

import org.apache.flink.api.common.functions.Partitioner;

public class MyPartitioner implements Partitioner<String> {
    @Override
    public int partition(String key, int numPartitions) {
        return Integer.parseInt(key) % numPartitions;
    }
}