java - Storm java.io.NotSerializableException : when running topology

Question

我终于想到我有一个写在redis数据库上的拓扑。我有一个要打印的 bolt ，还有一个要插入 redis 的 bolt 。但是当我尝试启动拓扑时，它出现了这个错误:

...5333 [main-EventThread] INFO  o.a.s.s.o.a.c.f.s.ConnectionStateManager - State change: CONNECTED
5376 [main] INFO  b.s.d.supervisor - Starting supervisor with id 1917ef54-0f16-47b8-86ea-b6722aa33c68 at host amnor-A88XPLUS
5405 [main] ERROR o.a.s.s.o.a.z.s.NIOServerCnxnFactory - Thread Thread[main,5,main] died
java.lang.RuntimeException: java.io.NotSerializableException: Storm.practice.Storm.Prova.ProvaTopology
    at backtype.storm.utils.Utils.javaSerialize(Utils.java:91) ~[storm-core-0.10.0.jar:0.10.0]
    at backtype.storm.topology.TopologyBuilder.createTopology(TopologyBuilder.java:107) ~[storm-core-0.10.0.jar:0.10.0]
    at Storm.practice.Storm.Prova.ProvaTopology.main(ProvaTopology.java:383) ~[classes/:?]
Caused by: java.io.NotSerializableException: Storm.practice.Storm.Prova.ProvaTopology
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1183) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1547) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1508) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1431) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1177) ~[?:1.7.0_91]
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347) ~[?:1.7.0_91]
    at backtype.storm.utils.Utils.javaSerialize(Utils.java:87) ~[storm-core-0.10.0.jar:0.10.0]
    ... 2 more

我认为它可能是 Spout，但我已经尝试使用 Storm Examples 上可用的示例 Spout 并且发生了相同的情况。我的代码只是在读取的名称中添加笑脸，例如 (John :) :))，我只是想真正将流存储到 redis 数据库，它只是一个从文件中读取名称的小测试拓扑。之后，我正在为我大学的一个大数据项目做一个严肃的拓扑。这是我的代码(有很多未使用的导入，但那是因为我尝试了不同的方法来写入数据库):

package Storm.practice.Storm.Prova;
import backtype.storm.Config;
import backtype.storm.LocalCluster;
import backtype.storm.StormSubmitter;
import backtype.storm.task.OutputCollector;
import backtype.storm.task.TopologyContext;
import backtype.storm.testing.TestWordSpout;
import backtype.storm.topology.BasicOutputCollector;
import backtype.storm.topology.IRichBolt;
import backtype.storm.topology.OutputFieldsDeclarer;
import backtype.storm.topology.TopologyBuilder;
import backtype.storm.topology.base.BaseBasicBolt;
import backtype.storm.topology.base.BaseRichBolt;
import backtype.storm.tuple.Fields;
import backtype.storm.tuple.ITuple;
import backtype.storm.tuple.Tuple;
import backtype.storm.tuple.Values;
import backtype.storm.utils.Utils;
import backtype.storm.spout.SpoutOutputCollector;
import backtype.storm.topology.base.BaseRichSpout;

import java.util.List;
import java.util.Map;
import java.util.Random;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Logger;

import org.apache.storm.redis.bolt.AbstractRedisBolt;
import org.apache.storm.redis.bolt.RedisStoreBolt;
import org.apache.storm.redis.common.config.JedisClusterConfig;
import org.apache.storm.redis.common.config.JedisPoolConfig;
import org.apache.storm.redis.common.mapper.RedisDataTypeDescription;
import org.apache.storm.redis.common.mapper.RedisLookupMapper;
import org.apache.storm.redis.common.mapper.RedisStoreMapper;
import org.apache.storm.redis.trident.state.RedisState;
import org.apache.storm.redis.trident.state.RedisStateQuerier;
import org.apache.storm.redis.trident.state.RedisStateUpdater;
import org.apache.storm.shade.com.google.common.collect.Lists;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.JedisCommands;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
//import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.JedisPubSub;
import storm.trident.Stream;
import storm.trident.TridentState;
import storm.trident.TridentTopology;

/**
 * This is a basic example of a Storm topology.
 */
public class ProvaTopology {

  public static class ProvaBolt extends BaseRichBolt {
    OutputCollector _collector;

    public void prepare(Map conf, TopologyContext context, OutputCollector collector) {
      _collector = collector;
    }

    public void execute(Tuple tuple) {
      _collector.emit(tuple, new Values(tuple.getString(0) + "  :-)"));
      _collector.ack(tuple);
    }

    public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields("Morts"));
    }


  }
  public class ProvaSpout extends BaseRichSpout {
      SpoutOutputCollector _collector;
      //Random _rand;
      private String fileName;
      //private SpoutOutputCollector _collector;
      private BufferedReader reader;
      private AtomicLong linesRead;

      public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
        _collector = collector;
        try {
            fileName= (String)"/home/prova.txt";
            reader = new BufferedReader(new FileReader(fileName));
            // read and ignore the header if one exists
          } catch (Exception e) {
            throw new RuntimeException(e);
          }
       // _rand = new Random();
      }

      public void nextTuple() {
        Utils.sleep(100);


      try {
            String line = reader.readLine();
            if (line != null) {
              long id = linesRead.incrementAndGet();
              System.out.println("Finished reading line, " + line);
              _collector.emit(new Values((String)line));
            } else {
              System.out.println("Finished reading file, " + linesRead.get() + " lines read");
              Thread.sleep(10000);
            }
          } catch (Exception e) {
            e.printStackTrace();
          }
      }

      public void ack(Object id) {
      }

      public void fail(Object id) {
      }

      public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields("Morts"));
      }

    }

  public class RedisBolt implements IRichBolt {

        protected String channel = "Somriures";
        //    protected String configChannel;
        protected OutputCollector collector;
        //    protected Tuple currentTuple;
        //    protected Logger log;
        protected JedisPool pool;
        //    protected ConfigListenerThread configListenerThread;

        public RedisBolt(){}
        public RedisBolt(String channel) {

        //  log = Logger.getLogger(getClass().getName());
        //  setupNonSerializableAttributes();
        }

        public void prepare(Map stormConf, TopologyContext context,
                OutputCollector collector) {
        this.collector = collector;
        pool = new JedisPool("localhost");
        }



        public void execute(Tuple tuple) {
        String current = tuple.getString(0);
        if(current != null) {
            //      for(Object obj: result) {
            publish(current);
            collector.emit(tuple, new Values(current));
            //      }
            collector.ack(tuple);
        }
        }

        public void cleanup() {
        if(pool != null) {
            pool.destroy();
        }
        }

        public void declareOutputFields(OutputFieldsDeclarer declarer) {
        declarer.declare(new Fields(channel));
        }

        public void publish(String msg) {
        Jedis jedis = pool.getResource();
        jedis.publish(channel, msg);
        pool.returnResource(jedis);
        }

        protected void setupNonSerializableAttributes() {

        }

        public Map getComponentConfiguration() {
        return null;
        }
    }



  public class PrinterBolt extends BaseBasicBolt {

      public void execute(Tuple tuple, BasicOutputCollector collector) {
          System.out.println(tuple);
      }

      public void declareOutputFields(OutputFieldsDeclarer ofd) {
      }

  }


    public static void main(String[] args) throws Exception {
    TopologyBuilder builder = new TopologyBuilder();
   ProvaTopology Pt = new ProvaTopology();
   JedisPoolConfig poolConfig = new JedisPoolConfig.Builder()
            .setHost("127.0.0.1").setPort(666).build();



    builder.setSpout("Morts", Pt.new ProvaSpout(), 10);//emisorTestWordSpout
    builder.setBolt("happy", new ProvaBolt(), 3).shuffleGrouping("Morts");// de on llig?
    builder.setBolt("meal", new ProvaBolt(), 2).shuffleGrouping("happy");// de on llig?
    builder.setBolt("bd", Pt.new RedisBolt(), 2).shuffleGrouping("meal");// de on llig?
    builder.setBolt("print", Pt.new PrinterBolt(), 2).shuffleGrouping("meal");
   // builder.setBolt("StoreM", (storeMapperS));
    Config conf = new Config();
    conf.setDebug(true);

    if (args != null && args.length > 0) {
      conf.setNumWorkers(5);

      StormSubmitter.submitTopology(args[0], conf, builder.createTopology());
                                   //WithProgressBar
    }
    else {

      LocalCluster cluster = new LocalCluster();
      cluster.submitTopology("test", conf, builder.createTopology());
      Utils.sleep(10000);
      cluster.killTopology("test");
      cluster.shutdown();
    }
  }
}

提前致谢

Answer 1

这里的异常(exception)非常明显。如果您只是查看有关 java.io.NotSerializableException 的文档，您会发现正在打印的消息是不可序列化的类。要修复，只需让您的 Topology 类实现 Serializable:

public class ProvaTopology implements Serializable {
    ...
}

这是必需的，以便 Storm 可以序列化您的 Topology 并将其发送到 Nimbus 执行。由于您的 Bolt 和 Spout 扩展或实现了 Storm 提供的类或接口(interface)，您不必担心将它们标记为可序列化，因为这些父类和接口(interface)已经这样做了。