Java SimulatorTaskTracker類代碼示例

import org.apache.hadoop.mapred.SimulatorTaskTracker; //導入依賴的package包/類
/**
 * Start simulated task trackers based on topology.
 * @param clusterStory The cluster topology.
 * @param now
 *    time stamp when the simulator is started, {@link SimulatorTaskTracker}s
 *    are started shortly after this time stamp
 */
void startTaskTrackers(ClusterStory clusterStory, long now) {
  /** port assigned to TTs, incremented by 1 for each TT */
  int port = 10000;
  long ms = now + 100;

  for (MachineNode node : clusterStory.getMachines()) {
    String hostname = node.getName();
    RackNode rackNode = node.getRackNode();
    StaticMapping.addNodeToRack(hostname, rackNode.getName());
    String taskTrackerName = "tracker_" + hostname + ":localhost/127.0.0.1:"
        + port;
    port++;
    SimulatorTaskTracker tt = new SimulatorTaskTracker(jt, taskTrackerName,
        hostname, node.getMapSlots(), node.getReduceSlots());
    queue.addAll(tt.init(ms++));
  }
}
 

import org.apache.hadoop.mapred.SimulatorTaskTracker; //導入依賴的package包/類
/**
 * Start simulated task trackers based on topology.
 * @param clusterStory the cluster topology.
 * @param jobConf configuration object.
 * @param now
 *    time stamp when the simulator is started, {@link SimulatorTaskTracker}s
 *    are started uniformly randomly spread in [now,now+startDuration).
 * @return time stamp by which the entire cluster is booted up and all task
 *    trackers are sending hearbeats in their steady rate.
 */
long startTaskTrackers(ClusterStory cluster, JobConf jobConf, long now) {
  /** port assigned to TTs, incremented by 1 for each TT */
  int port = 10000;
  int numTaskTrackers = 0;

  Random random = new Random(RandomSeedGenerator.getSeed(
     "forStartTaskTrackers()", masterRandomSeed));

  final int startDuration = jobConf.getInt("mumak.cluster.startup.duration",
      DEFAULT_CLUSTER_STARTUP_DURATION);
  
  for (MachineNode node : cluster.getMachines()) {
    jobConf.set("mumak.tasktracker.host.name", node.getName());
    jobConf.set("mumak.tasktracker.tracker.name",
        "tracker_" + node.getName() + ":localhost/127.0.0.1:" + port);
    long subRandomSeed = RandomSeedGenerator.getSeed(
       "forTaskTracker" + numTaskTrackers, masterRandomSeed);
    jobConf.setLong("mumak.tasktracker.random.seed", subRandomSeed);
    numTaskTrackers++;
    port++;
    SimulatorTaskTracker tt = new SimulatorTaskTracker(jt, jobConf);
    long firstHeartbeat = now + random.nextInt(startDuration);
    queue.addAll(tt.init(firstHeartbeat));
  }
  
  // In startDuration + heartbeat interval of the full cluster time each 
  // TT is started up and told on its 2nd heartbeat to beat at a rate 
  // corresponding to the steady state of the cluster    
  long clusterSteady = now + startDuration + jt.getNextHeartbeatInterval();
  return clusterSteady;
}
 

import org.apache.hadoop.mapred.SimulatorTaskTracker; //導入依賴的package包/類
/**
 * Initiate components in the simulation. The JobConf is
 * create separately and passed to the init().
 * @param JobConf: The configuration for the jobtracker.
 * @throws InterruptedException
 * @throws IOException if trace or topology files cannot be opened.
 */
@SuppressWarnings("deprecation")
void init(JobConf jobConf) throws InterruptedException, IOException {
  
  FileSystem lfs = FileSystem.getLocal(getConf());
  Path logPath =
    new Path(System.getProperty("hadoop.log.dir")).makeQualified(lfs);
  jobConf.set("mapred.system.dir", logPath.toString());
  jobConf.set("hadoop.job.history.location", (new Path(logPath, "history")
      .toString()));
  
  // start time for virtual clock
  // possible improvement: set default value to sth more meaningful based on
  // the 1st job
  long now = getTimeProperty(jobConf, "mumak.start.time", 
                             System.currentTimeMillis());

  jt = SimulatorJobTracker.startTracker(jobConf, now, this);
  jt.offerService();
  
  masterRandomSeed = jobConf.getLong("mumak.random.seed", System.nanoTime()); 
  
  // max Map/Reduce tasks per node
  int maxMaps = getConf().getInt(
      "mapred.tasktracker.map.tasks.maximum",
      SimulatorTaskTracker.DEFAULT_MAP_SLOTS);
  int maxReduces = getConf().getInt(
      "mapred.tasktracker.reduce.tasks.maximum",
  
    SimulatorTaskTracker.DEFAULT_REDUCE_SLOTS);

  MachineNode defaultNode = new MachineNode.Builder("default", 2)
      .setMapSlots(maxMaps).setReduceSlots(maxReduces).build();
          
  LoggedNetworkTopology topology = new ClusterTopologyReader(new Path(
      topologyFile), jobConf).get();
  // Setting the static mapping before removing numeric IP hosts.
  setStaticMapping(topology);
  if (getConf().getBoolean("mumak.topology.filter-numeric-ips", true)) {
    removeIpHosts(topology);
  }
  ZombieCluster cluster = new ZombieCluster(topology, defaultNode);
  
  // create TTs based on topology.json  
  long firstJobStartTime = startTaskTrackers(cluster, jobConf, now);

  long subRandomSeed = RandomSeedGenerator.getSeed("forSimulatorJobStoryProducer",
                                                   masterRandomSeed);
  JobStoryProducer jobStoryProducer = new SimulatorJobStoryProducer(
      new Path(traceFile), cluster, firstJobStartTime, jobConf, subRandomSeed);

  final SimulatorJobSubmissionPolicy submissionPolicy = SimulatorJobSubmissionPolicy
      .getPolicy(jobConf);

  jc = new SimulatorJobClient(jt, jobStoryProducer, submissionPolicy);
  queue.addAll(jc.init(firstJobStartTime));

  //if the taskScheduler is CapacityTaskScheduler start off the JobInitialization
  //threads too
  if (jobConf.get("mapred.jobtracker.taskScheduler").equals
     (CapacityTaskScheduler.class.getName())) {
    LOG.info("CapacityScheduler used: starting simulatorThreads");
    startSimulatorThreadsCapSched(now);
  }
  terminateTime = getTimeProperty(jobConf, "mumak.terminate.time",
                                  Long.MAX_VALUE);
}