"Speed of light topology Roshan provided" + printing metrics

BasicTopology.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package storm.starter;

import org.apache.storm.Config;
import org.apache.storm.StormSubmitter;
import org.apache.storm.generated.ClusterSummary;
import org.apache.storm.generated.ExecutorSummary;
import org.apache.storm.generated.KillOptions;
import org.apache.storm.generated.Nimbus;
import org.apache.storm.generated.SpoutStats;
import org.apache.storm.generated.TopologyInfo;
import org.apache.storm.generated.TopologySummary;
import org.apache.storm.hdfs.spout.Configs;
import org.apache.storm.hdfs.spout.HdfsSpout;
import org.apache.storm.metric.LoggingMetricsConsumer;
import org.apache.storm.spout.SpoutOutputCollector;
import org.apache.storm.starter.FastWordCountTopology;
import org.apache.storm.task.OutputCollector;
import org.apache.storm.task.TopologyContext;
import org.apache.storm.topology.IRichSpout;
import org.apache.storm.topology.OutputFieldsDeclarer;
import org.apache.storm.topology.TopologyBuilder;
import org.apache.storm.topology.base.BaseRichBolt;
import org.apache.storm.topology.base.BaseRichSpout;
import org.apache.storm.tuple.Fields;
import org.apache.storm.tuple.Tuple;
import org.apache.storm.tuple.Values;
import org.apache.storm.utils.NimbusClient;
import org.apache.storm.utils.Utils;


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


public class BasicTopology {

  public static final String SPOUT_ID = "spoutRand";
  public static final String BOLT_ID = "boltIncDouble";

  /** Copies text file content from sourceDir to destinationDir. Moves source files into sourceDir
   * after its done consuming */
  public static void main(String[] args) throws Exception {

    String topologyName = "BasicTopology";

    TopologyBuilder builder = new TopologyBuilder();

    // setup spout
    IRichSpout spout = new RandomNumberSpout();
    builder.setSpout(SPOUT_ID, spout, 1);

    // setup bolt
    builder.setBolt(BOLT_ID, new IncrementDoubleBolt(), 1)
            .localOrShuffleGrouping(SPOUT_ID);
    builder.createTopology();

    // configure topology and submit
    Config conf = new Config();
    conf.setNumWorkers(1);
    conf.setNumAckers(0);
    conf.setMaxTaskParallelism(1);
    conf.setNumWorkers(1);
    conf.setDebug(false);

    // submit topology
    StormSubmitter.submitTopologyWithProgressBar(topologyName, conf, builder.createTopology());

    Map clusterConf = Utils.readStormConfig();
    clusterConf.putAll(Utils.readCommandLineOpts());
    Nimbus.Client client = NimbusClient.getConfiguredClient(clusterConf).getClient();

    TopologyInfo latestTopologyInfo = null;
    //Sleep for 10 mins
    for (int i = 0; i < 20; i++) {
      Thread.sleep(30 * 1000);
      TopologyInfo newTopologyInfo = getLatestTopologyInfo(client, topologyName);
      printMetrics(latestTopologyInfo, newTopologyInfo);
      latestTopologyInfo = newTopologyInfo;
    }
    kill(client, topologyName);
  } // main

  private static TopologyInfo getLatestTopologyInfo(Nimbus.Client client, String topologyName) throws Exception {
    ClusterSummary summary = client.getClusterInfo();
    String id = null;
    for (TopologySummary ts: summary.get_topologies()) {
      if (topologyName.equals(ts.get_name())) {
        id = ts.get_id();
      }
    }
    if (id == null) {
      throw new Exception("Could not find a topology named "+topologyName);
    }
    return client.getTopologyInfo(id);
  }

  static class MetricInfo {
    private int uptime;
    private long emittedSpout;
    private long emittedBolt;

    public MetricInfo(int uptime, long emittedSpout, long emittedBolt) {
      this.uptime = uptime;
      this.emittedSpout = emittedSpout;
      this.emittedBolt = emittedBolt;
    }

    public int getUptime() {
      return uptime;
    }

    public long getEmittedSpout() {
      return emittedSpout;
    }

    public long getEmittedBolt() {
      return emittedBolt;
    }
  }

  public static void printMetrics(TopologyInfo oldInfo, TopologyInfo newInfo) throws Exception {
    MetricInfo lastMetric;
    if (oldInfo == null) {
      lastMetric = new MetricInfo(0, 0, 0);
    } else {
      lastMetric = extractMetricInfo(oldInfo);
    }

    MetricInfo currMetric = extractMetricInfo(newInfo);

    int uptimeDiff = currMetric.getUptime() - lastMetric.getUptime();
    long emittedSpoutDiff = (currMetric.getEmittedSpout() - lastMetric.getEmittedSpout());
    long emittedBoltDiff = (currMetric.getEmittedBolt() - lastMetric.getEmittedBolt());
    double spoutEmitsPerSecInDuration = ((double)emittedSpoutDiff) / uptimeDiff;
    double boltEmitsPerSecInDuration = ((double)emittedBoltDiff) / uptimeDiff;

    System.out.println("uptime: " + currMetric.getUptime() + " duration: " + uptimeDiff + " secs");
    System.out.println("spout emitted: " + emittedSpoutDiff + " (total: " + currMetric.getEmittedSpout() + ") emitted/sec (in duration): " + spoutEmitsPerSecInDuration);
    System.out.println("bolt emitted: " + emittedBoltDiff + " (total: " + currMetric.getEmittedBolt() + ") emitted/sec (in duration): " + boltEmitsPerSecInDuration);
  }

  private static MetricInfo extractMetricInfo(TopologyInfo info) {
    int uptime = info.get_uptime_secs();
    long emittedSpout = 0;
    long emittedBolt = 0;

    for (ExecutorSummary exec: info.get_executors()) {
      if (SPOUT_ID.equals(exec.get_component_id())) {
        Map<String, Long> emittedMap = exec.get_stats().get_emitted().get(":all-time");
        for (String key: emittedMap.keySet()) {
          long emitVal = emittedMap.get(key);
          emittedSpout += emitVal;
        }
      } else if (BOLT_ID.equals(exec.get_component_id())) {
        Map<String, Long> emittedMap = exec.get_stats().get_emitted().get(":all-time");
        for (String key: emittedMap.keySet()) {
          long emitVal = emittedMap.get(key);
          emittedBolt += emitVal;
        }
      }
    }

    return new MetricInfo(uptime, emittedSpout, emittedBolt);
  }

  public static void kill(Nimbus.Client client, String name) throws Exception {
    KillOptions opts = new KillOptions();
    opts.set_wait_secs(0);
    client.killTopologyWithOpts(name, opts);
  }

  public static class RandomNumberSpout extends BaseRichSpout {

    private static final long serialVersionUID = -4100642374496292646L;
    public static final String FIELDS = "number";

    private long messageCount = 0;
    private SpoutOutputCollector collector = null;
    //  private StringBuffer message = null;
    private Random rand = null;


    public void open(Map conf, TopologyContext context, SpoutOutputCollector collector) {
      this.rand = new Random();
      this.collector = collector;
    }


    @Override
    public void nextTuple() {
      collector.emit(new Values(new Long(rand.nextInt(Integer.MAX_VALUE))), messageCount);
      messageCount++;
    }


    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields(FIELDS));
    }
  } // class RandomNumberSpout


  public static class IncrementDoubleBolt extends BaseRichBolt {
    private static final long serialVersionUID = -5313598399155365865L;
    public static final String FIELDS = "number";
    private OutputCollector collector;


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

    @Override
    public void execute(Tuple tuple) {
      Long val = (Long) tuple.getValue(0);
      collector.emit(new Values( 2*(val+1)) );  // increment and double the value
      collector.ack(tuple);
    }

    @Override
    public void declareOutputFields(OutputFieldsDeclarer declarer) {
      declarer.declare(new Fields(FIELDS));
    }
  } // class IncrementDoubleBolt

}