/**
* 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 org.apache.hadoop.mapreduce.v2;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Random;
import org.junit.Assert;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.v2.api.records.JobState;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskAttemptState;
import org.apache.hadoop.mapreduce.v2.api.records.TaskId;
import org.apache.hadoop.mapreduce.v2.api.records.TaskState;
import org.apache.hadoop.mapreduce.v2.app.ControlledClock;
import org.apache.hadoop.mapreduce.v2.app.MRApp;
import org.apache.hadoop.mapreduce.v2.app.job.Job;
import org.apache.hadoop.mapreduce.v2.app.job.Task;
import org.apache.hadoop.mapreduce.v2.app.job.TaskAttempt;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptEventType;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent;
import org.apache.hadoop.mapreduce.v2.app.job.event.TaskAttemptStatusUpdateEvent.TaskAttemptStatus;
import org.apache.hadoop.service.Service;
import org.apache.hadoop.test.GenericTestUtils;
import org.apache.hadoop.yarn.event.EventHandler;
import org.apache.hadoop.yarn.util.Clock;
import org.apache.hadoop.yarn.util.SystemClock;
import org.junit.Test;
import com.google.common.base.Supplier;
@SuppressWarnings({ "unchecked", "rawtypes" })
public class TestSpeculativeExecutionWithMRApp {
private static final int NUM_MAPPERS = 5;
private static final int NUM_REDUCERS = 0;
@Test
public void testSpeculateSuccessfulWithoutUpdateEvents() throws Exception {
Clock actualClock = new SystemClock();
final ControlledClock clock = new ControlledClock(actualClock);
clock.setTime(System.currentTimeMillis());
MRApp app =
new MRApp(NUM_MAPPERS, NUM_REDUCERS, false, "test", true, clock);
Job job = app.submit(new Configuration(), true, true);
app.waitForState(job, JobState.RUNNING);
Map<TaskId, Task> tasks = job.getTasks();
Assert.assertEquals("Num tasks is not correct", NUM_MAPPERS + NUM_REDUCERS,
tasks.size());
Iterator<Task> taskIter = tasks.values().iterator();
while (taskIter.hasNext()) {
app.waitForState(taskIter.next(), TaskState.RUNNING);
}
// Process the update events
clock.setTime(System.currentTimeMillis() + 2000);
EventHandler appEventHandler = app.getContext().getEventHandler();
for (Map.Entry<TaskId, Task> mapTask : tasks.entrySet()) {
for (Map.Entry<TaskAttemptId, TaskAttempt> taskAttempt : mapTask
.getValue().getAttempts().entrySet()) {
TaskAttemptStatus status =
createTaskAttemptStatus(taskAttempt.getKey(), (float) 0.8,
TaskAttemptState.RUNNING);
TaskAttemptStatusUpdateEvent event =
new TaskAttemptStatusUpdateEvent(taskAttempt.getKey(), status);
appEventHandler.handle(event);
}
}
Random generator = new Random();
Object[] taskValues = tasks.values().toArray();
final Task taskToBeSpeculated =
(Task) taskValues[generator.nextInt(taskValues.length)];
// Other than one random task, finish every other task.
for (Map.Entry<TaskId, Task> mapTask : tasks.entrySet()) {
for (Map.Entry<TaskAttemptId, TaskAttempt> taskAttempt : mapTask
.getValue().getAttempts().entrySet()) {
if (mapTask.getKey() != taskToBeSpeculated.getID()) {
appEventHandler.handle(new TaskAttemptEvent(taskAttempt.getKey(),
TaskAttemptEventType.TA_DONE));
appEventHandler.handle(new TaskAttemptEvent(taskAttempt.getKey(),
TaskAttemptEventType.TA_CONTAINER_CLEANED));
app.waitForState(taskAttempt.getValue(), TaskAttemptState.SUCCEEDED);
}
}
}
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
if (taskToBeSpeculated.getAttempts().size() != 2) {
clock.setTime(System.currentTimeMillis() + 1000);
return false;
} else {
return true;
}
}
}, 1000, 60000);
// finish 1st TA, 2nd will be killed
TaskAttempt[] ta = makeFirstAttemptWin(appEventHandler, taskToBeSpeculated);
verifySpeculationMessage(app, ta);
app.waitForState(Service.STATE.STOPPED);
}
@Test
public void testSepculateSuccessfulWithUpdateEvents() throws Exception {
Clock actualClock = new SystemClock();
final ControlledClock clock = new ControlledClock(actualClock);
clock.setTime(System.currentTimeMillis());
MRApp app =
new MRApp(NUM_MAPPERS, NUM_REDUCERS, false, "test", true, clock);
Job job = app.submit(new Configuration(), true, true);
app.waitForState(job, JobState.RUNNING);
Map<TaskId, Task> tasks = job.getTasks();
Assert.assertEquals("Num tasks is not correct", NUM_MAPPERS + NUM_REDUCERS,
tasks.size());
Iterator<Task> taskIter = tasks.values().iterator();
while (taskIter.hasNext()) {
app.waitForState(taskIter.next(), TaskState.RUNNING);
}
// Process the update events
clock.setTime(System.currentTimeMillis() + 1000);
EventHandler appEventHandler = app.getContext().getEventHandler();
for (Map.Entry<TaskId, Task> mapTask : tasks.entrySet()) {
for (Map.Entry<TaskAttemptId, TaskAttempt> taskAttempt : mapTask
.getValue().getAttempts().entrySet()) {
TaskAttemptStatus status =
createTaskAttemptStatus(taskAttempt.getKey(), (float) 0.5,
TaskAttemptState.RUNNING);
TaskAttemptStatusUpdateEvent event =
new TaskAttemptStatusUpdateEvent(taskAttempt.getKey(), status);
appEventHandler.handle(event);
}
}
Task speculatedTask = null;
int numTasksToFinish = NUM_MAPPERS + NUM_REDUCERS - 1;
clock.setTime(System.currentTimeMillis() + 1000);
for (Map.Entry<TaskId, Task> task : tasks.entrySet()) {
for (Map.Entry<TaskAttemptId, TaskAttempt> taskAttempt : task.getValue()
.getAttempts().entrySet()) {
if (numTasksToFinish > 0) {
appEventHandler.handle(new TaskAttemptEvent(taskAttempt.getKey(),
TaskAttemptEventType.TA_DONE));
appEventHandler.handle(new TaskAttemptEvent(taskAttempt.getKey(),
TaskAttemptEventType.TA_CONTAINER_CLEANED));
numTasksToFinish--;
app.waitForState(taskAttempt.getValue(), TaskAttemptState.SUCCEEDED);
} else {
// The last task is chosen for speculation
TaskAttemptStatus status =
createTaskAttemptStatus(taskAttempt.getKey(), (float) 0.75,
TaskAttemptState.RUNNING);
speculatedTask = task.getValue();
TaskAttemptStatusUpdateEvent event =
new TaskAttemptStatusUpdateEvent(taskAttempt.getKey(), status);
appEventHandler.handle(event);
}
}
}
clock.setTime(System.currentTimeMillis() + 15000);
for (Map.Entry<TaskId, Task> task : tasks.entrySet()) {
for (Map.Entry<TaskAttemptId, TaskAttempt> taskAttempt : task.getValue()
.getAttempts().entrySet()) {
if (taskAttempt.getValue().getState() != TaskAttemptState.SUCCEEDED) {
TaskAttemptStatus status =
createTaskAttemptStatus(taskAttempt.getKey(), (float) 0.75,
TaskAttemptState.RUNNING);
TaskAttemptStatusUpdateEvent event =
new TaskAttemptStatusUpdateEvent(taskAttempt.getKey(), status);
appEventHandler.handle(event);
}
}
}
final Task speculatedTaskConst = speculatedTask;
GenericTestUtils.waitFor(new Supplier<Boolean>() {
@Override
public Boolean get() {
if (speculatedTaskConst.getAttempts().size() != 2) {
clock.setTime(System.currentTimeMillis() + 1000);
return false;
} else {
return true;
}
}
}, 1000, 60000);
TaskAttempt[] ta = makeFirstAttemptWin(appEventHandler, speculatedTask);
verifySpeculationMessage(app, ta);
app.waitForState(Service.STATE.STOPPED);
}
private static TaskAttempt[] makeFirstAttemptWin(
EventHandler appEventHandler, Task speculatedTask) {
// finish 1st TA, 2nd will be killed
Collection<TaskAttempt> attempts = speculatedTask.getAttempts().values();
TaskAttempt[] ta = new TaskAttempt[attempts.size()];
attempts.toArray(ta);
appEventHandler.handle(
new TaskAttemptEvent(ta[0].getID(), TaskAttemptEventType.TA_DONE));
appEventHandler.handle(new TaskAttemptEvent(ta[0].getID(),
TaskAttemptEventType.TA_CONTAINER_CLEANED));
return ta;
}
private static void verifySpeculationMessage(MRApp app, TaskAttempt[] ta)
throws Exception {
app.waitForState(ta[0], TaskAttemptState.SUCCEEDED);
// The speculative attempt may be not killed before the MR job succeeds.
}
private TaskAttemptStatus createTaskAttemptStatus(TaskAttemptId id,
float progress, TaskAttemptState state) {
TaskAttemptStatus status = new TaskAttemptStatus();
status.id = id;
status.progress = progress;
status.taskState = state;
return status;
}
}