java - 我在 spout 类中的失败方法仅适用于第一个 bolt ，从第二个 bolt 开始它不起作用。

Question

注意:
Bolt1 包含前三个质数(2,3,5)的列表。
Bolt2 包含后三组质数(7,11,13)的列表。
在 Bolt3 中，它只是检查数字是否为素数。
从第一个 bolt 开始，我可以从 spout 类调用 Fail()，但从第二个 bolt 开始，我无法从 spout 类调用 Fail()。

拓扑类:

        ......
        TopologyBuilder builder = new TopologyBuilder();
        builder.setSpout("spout", new SpoutClass(), 1);
        builder.setBolt("bolt1", new Bolt1(), 1).shuffleGrouping("spout");
        builder.setBolt("bolt2", new Bolt2(), 1).shuffleGrouping("bolt1");
        builder.setBolt("bolt3", new Bolt3(), 1).shuffleGrouping("bolt2");  

Spout 类:

SpoutClass implements IRichSpout{
    private SpoutOutputCollector collector;
    private TopologyContext context;

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

    public void nextTuple() {
        try {
            //messageQueue is blocking queue which contains data 
            String msg = messageQueue.take();
            String ackId = msg;
            this.collector.emit(new Values(msg), ackId);

        }catch (Exception e) {
            e.printStackTrace();
        }
    }
    public void ack(Object msgId) {

        System.out.println("Acknowledges that this tuple has been processed ........... " + msgId);

    }

    public void fail(Object msgId) {

        System.out.println("FAILED To Process Message :-" + msgId);

    }
}

Bolt1 类:

public class Bolt1 extends BaseRichBolt {
private OutputCollector collector;
ArrayList<Integer> firstthreePrime = new ArrayList<Integer>();
        firstthreePrime.add(2);
        firstthreePrime.add(3);
        firstthreePrime.add(5);
public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
        this.collector = collector;
    }
    public void execute(Tuple tuple) {

        String message = (String) tuple.getValueByField("msg");

        System.out.println("Received " + message + " in Bolt1.");
        Integer number = Integer.valueOf(message);
        if (check this number contains bolt1 or not) {
            //if number is contains
            System.out.println(" Number is prime ............." + number + " and Throw from Bolt1");
            this.collector.fail(tuple);
        } else {
            collector.emit(new Values(message));
            collector.ack(tuple);
        }
    }
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("msg"));
    }
}

Bolt2 类:

public class Bolt2 extends BaseRichBolt {
private OutputCollector collector;
ArrayList<Integer> secondthreePrime = new ArrayList<Integer>();
        secondthreePrime.add(7);
        secondthreePrime.add(11);
        secondthreePrime.add(13);
public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
        this.collector = collector;

    }
    public void execute(Tuple tuple) {

        String message = (String) tuple.getValueByField("msg");

        System.out.println("Received " + message + " in Bolt2.");
        Integer number = Integer.valueOf(message);
        if (check this number contains bolt2 or not) {
            //if number is contains
            System.out.println(" Number is prime ............." + number + " and Throw from Bolt2");
            this.collector.fail(tuple);
        } else {
            collector.emit(new Values(message));
            collector.ack(tuple);
        }
    }
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("msg"));
    }
}

Bolt3 类:

public class Bolt3 extends BaseRichBolt {
private OutputCollector collector;

public void prepare(Map stormConf, TopologyContext context, OutputCollector collector) {
        this.collector = collector;

    }
    public void execute(Tuple tuple) {

        String message = (String) tuple.getValueByField("msg");

        System.out.println("Received " + message + " in Bolt3.");
        Integer number = Integer.valueOf(message);
        if (check this number is prime or not) {
            //if number is prime
            System.out.println(" Number is prime ............." + number + " and Throw from Bolt3");
            this.collector.fail(tuple);
        } else {
            collector.emit(new Values(message));
            collector.ack(tuple);
        }
    }
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
    }
}

Answer 1

既然您使用的是 BaseRichBolt，您不想锚定传出元组吗？

_collector.emit(tuple, new Values(message));

如果你不锚定它们，那么它们就没有到来自 spout 的元组的链接。查看文档:Guaranteeing Message Processing