一、概述

       将所有的 tuple 复制后分发给所有 bolt task。每个订阅数据流的 task 都会收到 tuple 的拷贝。

二、代码

1. Spout

package com.test.csdn.allgrouping;

import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Values;

import java.util.Map;
import java.util.Random;

/**
 * Created by Simon on 2018/8/1.
 */
public class AllGroupingSpout extends BaseRichSpout {

    private SpoutOutputCollector collector;

    private String[] str =  {"xiaomi","huawei","apple","oppo","vivo","lenovo","LG",
            "samsung","htc","honor","nokia","smartisan","Sony","BlackBerry","sharp"};


    @Override
    public void open(Map map, TopologyContext topologyContext, SpoutOutputCollector spoutOutputCollector) {
        this.collector=spoutOutputCollector;
    }

    @Override
    public void nextTuple() {
            try {
                Thread.sleep(1000);
                int i = new Random().nextInt(10);
                String string = str[i];
                collector.emit(new Values(string));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {
        outputFieldsDeclarer.declare(new Fields("string"));
    }
}

    2.Bolt

package com.test.csdn.allgrouping;

import org.apache.storm.topology.BasicOutputCollector;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.base.BaseBasicBolt;
import org.apache.storm.tuple.Tuple;

/**
 * Created by Simon on 2018/8/1.
 */
public class AllGroupingBolt extends BaseBasicBolt {

    @Override
    public void execute(Tuple tuple, BasicOutputCollector basicOutputCollector) {
        System.out.println(Thread.currentThread().getName()+"___"+tuple.getValue(0));
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer outputFieldsDeclarer) {

    }
}

     3.Topo

package com.test.csdn.allgrouping;

import com.test.csdn.globalgrouping.GlobalGroupingBolt;
import com.test.csdn.globalgrouping.GlobalGroupingSpout;
import org.apache.storm.Config;
import org.apache.storm.LocalCluster;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.utils.Utils;

/**
 * Created by Simon on 2018/8/1.
 */
public class AllGroupingTopo {

    public static void main(String[] args) {

        TopologyBuilder builder = new TopologyBuilder();

        builder.setSpout("spout", new AllGroupingSpout(),2).setNumTasks(3);
        //指定3个，便于测试
        builder.setBolt("bolt", new AllGroupingBolt(),3).setNumTasks(5).allGrouping("spout");

        Config conf = new Config();
        conf.setDebug(false);

        LocalCluster cluster = new LocalCluster();
        cluster.submitTopology("toplogy", conf, builder.createTopology());
        Utils.sleep(Long.MAX_VALUE);
        cluster.shutdown();

    }
}

三、运行输出

     3个Executor(24、18、30)  5个Task(5个Bolt实例)        每个task bolt都有接收到消息。