Beispiel #1
1
  /**
   * We lost the task tracker! All task-tracker structures have already been updated. Just process
   * the contained tasks and any jobs that might be affected.
   */
  void lostTaskTracker(String trackerName) {
    LOG.info("Lost tracker '" + trackerName + "'");
    TreeSet lostTasks = (TreeSet) trackerToTaskMap.get(trackerName);
    trackerToTaskMap.remove(trackerName);

    if (lostTasks != null) {
      for (Iterator it = lostTasks.iterator(); it.hasNext(); ) {
        String taskId = (String) it.next();
        TaskInProgress tip = (TaskInProgress) taskidToTIPMap.get(taskId);

        // Tell the job to fail the relevant task
        JobInProgress job = tip.getJob();
        job.failedTask(tip, taskId, trackerName);
      }
    }
  }
Beispiel #2
0
 /**
  * A tracker wants to know if any of its Tasks have been closed (because the job completed,
  * whether successfully or not)
  */
 public synchronized String pollForTaskWithClosedJob(String taskTracker) {
   TreeSet taskIds = (TreeSet) trackerToTaskMap.get(taskTracker);
   if (taskIds != null) {
     for (Iterator it = taskIds.iterator(); it.hasNext(); ) {
       String taskId = (String) it.next();
       TaskInProgress tip = (TaskInProgress) taskidToTIPMap.get(taskId);
       if (tip.shouldCloseForClosedJob(taskId)) {
         //
         // This is how the JobTracker ends a task at the TaskTracker.
         // It may be successfully completed, or may be killed in
         // mid-execution.
         //
         return taskId;
       }
     }
   }
   return null;
 }
Beispiel #3
0
 public synchronized TaskReport[] getReduceTaskReports(String jobid) {
   JobInProgress job = (JobInProgress) jobs.get(jobid);
   if (job == null) {
     return new TaskReport[0];
   } else {
     Vector reports = new Vector();
     Vector completeReduceTasks = job.reportTasksInProgress(false, true);
     for (Iterator it = completeReduceTasks.iterator(); it.hasNext(); ) {
       TaskInProgress tip = (TaskInProgress) it.next();
       reports.add(tip.generateSingleReport());
     }
     Vector incompleteReduceTasks = job.reportTasksInProgress(false, false);
     for (Iterator it = incompleteReduceTasks.iterator(); it.hasNext(); ) {
       TaskInProgress tip = (TaskInProgress) it.next();
       reports.add(tip.generateSingleReport());
     }
     return (TaskReport[]) reports.toArray(new TaskReport[reports.size()]);
   }
 }
Beispiel #4
0
  /**
   * Accept and process a new TaskTracker profile. We might have known about the TaskTracker
   * previously, or it might be brand-new. All task-tracker structures have already been updated.
   * Just process the contained tasks and any jobs that might be affected.
   */
  void updateTaskStatuses(TaskTrackerStatus status) {
    for (Iterator it = status.taskReports(); it.hasNext(); ) {
      TaskStatus report = (TaskStatus) it.next();
      TaskInProgress tip = (TaskInProgress) taskidToTIPMap.get(report.getTaskId());
      if (tip == null) {
        LOG.info(
            "Serious problem.  While updating status, cannot find taskid " + report.getTaskId());
      } else {
        JobInProgress job = tip.getJob();
        job.updateTaskStatus(tip, report);

        if (report.getRunState() == TaskStatus.SUCCEEDED) {
          job.completedTask(tip, report.getTaskId());
        } else if (report.getRunState() == TaskStatus.FAILED) {
          // Tell the job to fail the relevant task
          job.failedTask(tip, report.getTaskId(), status.getTrackerName());
        }
      }
    }
  }
Beispiel #5
0
  /**
   * A TaskTracker wants to know the physical locations of completed, but not yet closed, tasks.
   * This exists so the reduce task thread can locate map task outputs.
   */
  public synchronized MapOutputLocation[] locateMapOutputs(
      String taskId, String[][] mapTasksNeeded) {
    ArrayList v = new ArrayList();
    for (int i = 0; i < mapTasksNeeded.length; i++) {
      for (int j = 0; j < mapTasksNeeded[i].length; j++) {
        TaskInProgress tip = (TaskInProgress) taskidToTIPMap.get(mapTasksNeeded[i][j]);
        if (tip != null && tip.isComplete(mapTasksNeeded[i][j])) {
          String trackerId = (String) taskidToTrackerMap.get(mapTasksNeeded[i][j]);
          TaskTrackerStatus tracker;
          synchronized (taskTrackers) {
            tracker = (TaskTrackerStatus) taskTrackers.get(trackerId);
          }
          v.add(new MapOutputLocation(mapTasksNeeded[i][j], tracker.getHost(), tracker.getPort()));
          break;
        }
      }
    }
    // randomly shuffle results to load-balance map output requests
    Collections.shuffle(v);

    return (MapOutputLocation[]) v.toArray(new MapOutputLocation[v.size()]);
  }
Beispiel #6
0
  ///////////////////////////////////////////////////////
  // Maintain lookup tables; called by JobInProgress
  // and TaskInProgress
  ///////////////////////////////////////////////////////
  void createTaskEntry(String taskid, String taskTracker, TaskInProgress tip) {
    LOG.info(
        "Adding task '"
            + taskid
            + "' to tip "
            + tip.getTIPId()
            + ", for tracker '"
            + taskTracker
            + "'");

    // taskid --> tracker
    taskidToTrackerMap.put(taskid, taskTracker);

    // tracker --> taskid
    TreeSet taskset = (TreeSet) trackerToTaskMap.get(taskTracker);
    if (taskset == null) {
      taskset = new TreeSet();
      trackerToTaskMap.put(taskTracker, taskset);
    }
    taskset.add(taskid);

    // taskid --> TIP
    taskidToTIPMap.put(taskid, tip);
  }
  private void printFailedAttempts(
      JspWriter out,
      JobTracker tracker,
      JobID jobId,
      TaskInProgress tip,
      TaskStatus.State failState)
      throws IOException {
    TaskStatus[] statuses = tip.getTaskStatuses();
    TaskID tipId = tip.getTIPId();
    for (int i = 0; i < statuses.length; ++i) {
      TaskStatus.State taskState = statuses[i].getRunState();
      if ((failState == null
              && (taskState == TaskStatus.State.FAILED || taskState == TaskStatus.State.KILLED))
          || taskState == failState) {
        String taskTrackerName = statuses[i].getTaskTracker();
        TaskTrackerStatus taskTracker = tracker.getTaskTrackerStatus(taskTrackerName);
        out.print(
            "<tr><td>"
                + statuses[i].getTaskID()
                + "</td><td><a href=\"taskdetails.jsp?jobid="
                + jobId
                + "&tipid="
                + tipId
                + "\">"
                + tipId
                + "</a></td>");
        if (taskTracker == null) {
          out.print("<td>" + taskTrackerName + "</td>");
        } else {
          out.print(
              "<td><a href=\"http://"
                  + taskTracker.getHost()
                  + ":"
                  + taskTracker.getHttpPort()
                  + "\">"
                  + taskTracker.getHost()
                  + "</a></td>");
        }
        out.print("<td>" + taskState + "</td>");
        out.print("<td><pre>");
        String[] failures = tracker.getTaskDiagnostics(statuses[i].getTaskID());
        if (failures == null) {
          out.print("&nbsp;");
        } else {
          for (int j = 0; j < failures.length; j++) {
            out.print(failures[j]);
            if (j < (failures.length - 1)) {
              out.print("\n-------\n");
            }
          }
        }
        out.print("</pre></td>");

        out.print("<td>");
        String taskLogUrl = null;
        if (taskTracker != null) {
          taskLogUrl =
              TaskLogServlet.getTaskLogUrl(
                  taskTracker.getHost(),
                  String.valueOf(taskTracker.getHttpPort()),
                  statuses[i].getTaskID().toString());
        }
        if (taskLogUrl != null) {
          String tailFourKBUrl = taskLogUrl + "&start=-4097";
          String tailEightKBUrl = taskLogUrl + "&start=-8193";
          String entireLogUrl = taskLogUrl;
          out.print("<a href=\"" + tailFourKBUrl + "\">Last 4KB</a><br/>");
          out.print("<a href=\"" + tailEightKBUrl + "\">Last 8KB</a><br/>");
          out.print("<a href=\"" + entireLogUrl + "\">All</a><br/>");
        } else {
          out.print("n/a"); // task tracker was lost
        }
        out.print("</td>");

        out.print("</tr>\n");
      }
    }
  }