Question

我是暴风雨的新手，我正在运行一个toplogy

public class FakeCallLogReaderSpout implements IRichSpout {
   //Create instance for SpoutOutputCollector which passes tuples to bolt.
   private SpoutOutputCollector collector;
   private boolean completed = false;

   //Create instance for TopologyContext which contains topology data.
   private TopologyContext context;

   //Create instance for Random class.
   private Random randomGenerator = new Random();
   private Integer idx = 0;

   @Override
   public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
      this.context = context;
      this.collector = collector;
   }

   @Override
   public void nextTuple() {
      if(this.idx <= 1000) {
         List<String> mobileNumbers = new ArrayList<String>();
         mobileNumbers.add("1234123401");
         mobileNumbers.add("1234123402");
         mobileNumbers.add("1234123403");
         mobileNumbers.add("1234123404");

         Integer localIdx = 0;
         while(localIdx++ < 100 && this.idx++ < 1000) {
            String fromMobileNumber = mobileNumbers.get(randomGenerator.nextInt(4));
            String toMobileNumber = mobileNumbers.get(randomGenerator.nextInt(4));

            while(fromMobileNumber == toMobileNumber) {
               toMobileNumber = mobileNumbers.get(randomGenerator.nextInt(4));
            }

            Integer duration = randomGenerator.nextInt(60);
            this.collector.emit(new Values(fromMobileNumber, toMobileNumber, duration),duration);
         }
      }
   }

   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("from", "to", "duration"));
   }

   //Override all the interface methods
   @Override
   public void close() {}

   public boolean isDistributed() {
      return false;
   }

   @Override
   public void activate() {}

   @Override 
   public void deactivate() {}

   @Override
   public void ack(Object msgId) {
       System.out.println(msgId);
   }

   @Override
   public void fail(Object msgId) {}

   @Override
   public Map<String, Object> getComponentConfiguration() {
      return null;
   }
}

//Create a class CallLogCreatorBolt which implement IRichBolt interface
public class CallLogCreatorBolt implements IRichBolt {
   //Create instance for OutputCollector which collects and emits tuples to produce output
   private OutputCollector collector;

   @Override
   public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      this.collector = collector;
   }

   @Override
   public void execute(Tuple tuple) {
      String from = tuple.getString(0);
      String to = tuple.getString(1);
      Integer duration = tuple.getInteger(2);
      collector.emit(new Values(from + " - " + to, duration));
   }

   @Override
   public void cleanup() {}

   @Override
   public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("call", "duration"));
   }

   @Override
   public Map<String, Object> getComponentConfiguration() {
      return null;
   }

}

public class CallLogCounterBolt implements IRichBolt {
   Map<String, Integer> counterMap;
   private OutputCollector collector;

   @Override
   public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      this.counterMap = new HashMap<String, Integer>();
      this.collector = collector;
   }

   @Override
   public void execute(Tuple tuple) {
      String call = tuple.getString(0);
      Integer duration = tuple.getInteger(1);

      if(!counterMap.containsKey(call)){
         counterMap.put(call, 1);
      }else{
         Integer c = counterMap.get(call) + 1;
         counterMap.put(call, c);
      }

      collector.ack(tuple);
   }

   @Override
   public void cleanup() {
      for(Map.Entry<String, Integer> entry:counterMap.entrySet()){
         System.out.println(entry.getKey()+" : " + entry.getValue());
      }
   }

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

   @Override
   public Map<String, Object> getComponentConfiguration() {
      return null;
   }

}

我从CallLogCounterBolt调用collector.ack(tuple)，但是ack没有被调用。

有没有人知道为什么没有被召唤？

另外如果从代码中完全删除ack，它会产生什么影响？

Answer 1

你需要在每个螺栓中锚定和确认元组。我猜你的拓扑结构就像FakeCallLogReaderSpout =＆gt; CallLogCreatorBolt =＆GT; CallLogCounterBolt。因此，在CallLogCreatorBolt你应该做

collector.emit(tuple, new Values(from + " - " + to, duration));
collector.ack();

阅读https://storm.apache.org/releases/0.10.0/Guaranteeing-message-processing.html了解详情。

在此风暴拓扑中没有收到确认？

}

1 个答案: