public void testLostTracker() throws IOException {
// Tracker 0 contacts JT
FakeObjectUtilities.establishFirstContact(jobTracker, trackers[0]);
TaskAttemptID[] tid = new TaskAttemptID[2];
JobConf conf = new JobConf();
conf.setNumMapTasks(1);
conf.setNumReduceTasks(1);
FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
job.initTasks();
// Tracker 0 gets the map task
tid[0] = job.findMapTask(trackers[0]);
job.finishTask(tid[0]);
// Advance clock. Tracker 0 would have got lost
clock.advance(8 * 1000);
jobTracker.checkExpiredTrackers();
// Tracker 1 establishes contact with JT
FakeObjectUtilities.establishFirstContact(jobTracker, trackers[1]);
// Tracker1 should get assigned the lost map task
tid[1] = job.findMapTask(trackers[1]);
assertNotNull("Map Task from Lost Tracker did not get reassigned", tid[1]);
assertEquals(
"Task ID of reassigned map task does not match",
tid[0].getTaskID().toString(),
tid[1].getTaskID().toString());
job.finishTask(tid[1]);
}
/** Test whether the tracker gets blacklisted after its lost. */
public void testLostTrackerBeforeBlacklisting() throws Exception {
FakeObjectUtilities.establishFirstContact(jobTracker, trackers[0]);
TaskAttemptID[] tid = new TaskAttemptID[3];
JobConf conf = new JobConf();
conf.setNumMapTasks(1);
conf.setNumReduceTasks(1);
conf.set(MRJobConfig.MAX_TASK_FAILURES_PER_TRACKER, "1");
conf.set(MRJobConfig.SETUP_CLEANUP_NEEDED, "false");
FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
job.initTasks();
job.setClusterSize(4);
// Tracker 0 gets the map task
tid[0] = job.findMapTask(trackers[0]);
job.finishTask(tid[0]);
// validate the total tracker count
assertEquals(
"Active tracker count mismatch", 1, jobTracker.getClusterStatus(false).getTaskTrackers());
// lose the tracker
clock.advance(1100);
jobTracker.checkExpiredTrackers();
assertFalse(
"Tracker 0 not lost",
jobTracker.getClusterStatus(false).getActiveTrackerNames().contains(trackers[0]));
// validate the total tracker count
assertEquals(
"Active tracker count mismatch", 0, jobTracker.getClusterStatus(false).getTaskTrackers());
// Tracker 1 establishes contact with JT
FakeObjectUtilities.establishFirstContact(jobTracker, trackers[1]);
// Tracker1 should get assigned the lost map task
tid[1] = job.findMapTask(trackers[1]);
assertNotNull("Map Task from Lost Tracker did not get reassigned", tid[1]);
assertEquals(
"Task ID of reassigned map task does not match",
tid[0].getTaskID().toString(),
tid[1].getTaskID().toString());
// finish the map task
job.finishTask(tid[1]);
// finish the reduce task
tid[2] = job.findReduceTask(trackers[1]);
job.finishTask(tid[2]);
// check if job is successful
assertEquals("Job not successful", JobStatus.SUCCEEDED, job.getStatus().getRunState());
// check if the tracker is lost
// validate the total tracker count
assertEquals(
"Active tracker count mismatch", 1, jobTracker.getClusterStatus(false).getTaskTrackers());
// validate blacklisted count .. since we lost one blacklisted tracker
assertEquals(
"Blacklisted tracker count mismatch",
0,
jobTracker.getClusterStatus(false).getBlacklistedTrackers());
}
/** Test whether the tracker gets lost after its blacklisted. */
public void testLostTrackerAfterBlacklisting() throws Exception {
FakeObjectUtilities.establishFirstContact(jobTracker, trackers[0]);
clock.advance(600);
TaskAttemptID[] tid = new TaskAttemptID[2];
JobConf conf = new JobConf();
conf.setNumMapTasks(1);
conf.setNumReduceTasks(0);
conf.set(MRJobConfig.MAX_TASK_FAILURES_PER_TRACKER, "1");
conf.set(MRJobConfig.SETUP_CLEANUP_NEEDED, "false");
FakeJobInProgress job = new FakeJobInProgress(conf, jobTracker);
job.initTasks();
job.setClusterSize(4);
// check if the tracker count is correct
assertEquals("Active tracker count mismatch", 1, jobTracker.taskTrackers().size());
// Tracker 0 gets the map task
tid[0] = job.findMapTask(trackers[0]);
// Fail the task
job.failTask(tid[0]);
// Tracker 1 establishes contact with JT
FakeObjectUtilities.establishFirstContact(jobTracker, trackers[1]);
// check if the tracker count is correct
assertEquals("Active tracker count mismatch", 2, jobTracker.taskTrackers().size());
// Tracker 1 gets the map task
tid[1] = job.findMapTask(trackers[1]);
// Finish the task and also the job
job.finishTask(tid[1]);
// check if job is successful
assertEquals("Job not successful", JobStatus.SUCCEEDED, job.getStatus().getRunState());
// check if the trackers 1 got blacklisted
assertTrue(
"Tracker 0 not blacklisted",
jobTracker.getBlacklistedTrackers()[0].getTaskTrackerName().equals(trackers[0]));
// check if the tracker count is correct
assertEquals("Active tracker count mismatch", 2, jobTracker.taskTrackers().size());
// validate blacklisted count
assertEquals(
"Blacklisted tracker count mismatch",
1,
jobTracker.getClusterStatus(false).getBlacklistedTrackers());
// Advance clock. Tracker 0 should be lost
clock.advance(500);
jobTracker.checkExpiredTrackers();
// check if the task tracker is lost
assertFalse(
"Tracker 0 not lost",
jobTracker.getClusterStatus(false).getActiveTrackerNames().contains(trackers[0]));
// check if the lost tracker has removed from the jobtracker
assertEquals("Active tracker count mismatch", 1, jobTracker.taskTrackers().size());
// validate blacklisted count
assertEquals(
"Blacklisted tracker count mismatch",
0,
jobTracker.getClusterStatus(false).getBlacklistedTrackers());
}