/**
* 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.app.launcher;
import static org.mockito.Mockito.mock;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.ThreadPoolExecutor;
import junit.framework.Assert;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.MRJobConfig;
import org.apache.hadoop.mapreduce.v2.api.records.JobId;
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.api.records.TaskType;
import org.apache.hadoop.mapreduce.v2.app.AppContext;
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.util.MRBuilderUtils;
import org.apache.hadoop.yarn.api.ContainerManager;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerToken;
import org.apache.hadoop.yarn.util.BuilderUtils;
import org.junit.Test;
public class TestContainerLauncher {
static final Log LOG = LogFactory
.getLog(TestContainerLauncher.class);
@Test
public void testPoolSize() throws InterruptedException {
ApplicationId appId = BuilderUtils.newApplicationId(12345, 67);
ApplicationAttemptId appAttemptId = BuilderUtils.newApplicationAttemptId(
appId, 3);
JobId jobId = MRBuilderUtils.newJobId(appId, 8);
TaskId taskId = MRBuilderUtils.newTaskId(jobId, 9, TaskType.MAP);
TaskAttemptId taskAttemptId = MRBuilderUtils.newTaskAttemptId(taskId, 0);
ContainerId containerId = BuilderUtils.newContainerId(appAttemptId, 10);
AppContext context = mock(AppContext.class);
CustomContainerLauncher containerLauncher = new CustomContainerLauncher(
context);
containerLauncher.init(new Configuration());
containerLauncher.start();
ThreadPoolExecutor threadPool = containerLauncher.getThreadPool();
// No events yet
Assert.assertEquals(0, threadPool.getPoolSize());
Assert.assertEquals(ContainerLauncherImpl.INITIAL_POOL_SIZE,
threadPool.getCorePoolSize());
Assert.assertNull(containerLauncher.foundErrors);
containerLauncher.expectedCorePoolSize = ContainerLauncherImpl.INITIAL_POOL_SIZE;
for (int i = 0; i < 10; i++) {
containerLauncher.handle(new ContainerLauncherEvent(taskAttemptId,
containerId, "host" + i + ":1234", null,
ContainerLauncher.EventType.CONTAINER_REMOTE_LAUNCH));
}
waitForEvents(containerLauncher, 10);
Assert.assertEquals(10, threadPool.getPoolSize());
Assert.assertNull(containerLauncher.foundErrors);
// Same set of hosts, so no change
containerLauncher.expectedCorePoolSize = ContainerLauncherImpl.INITIAL_POOL_SIZE;
containerLauncher.finishEventHandling = true;
for (int i = 0; i < 10; i++) {
containerLauncher.handle(new ContainerLauncherEvent(taskAttemptId,
containerId, "host" + i + ":1234", null,
ContainerLauncher.EventType.CONTAINER_REMOTE_LAUNCH));
}
waitForEvents(containerLauncher, 20);
Assert.assertEquals(10, threadPool.getPoolSize());
Assert.assertNull(containerLauncher.foundErrors);
// Different hosts, there should be an increase in core-thread-pool size to
// 21(11hosts+10buffer)
// Core pool size should be 21 but the live pool size should be only 11.
containerLauncher.expectedCorePoolSize = 12 + ContainerLauncherImpl.INITIAL_POOL_SIZE;
for (int i = 1; i <= 2; i++) {
containerLauncher.handle(new ContainerLauncherEvent(taskAttemptId,
containerId, "host1" + i + ":1234", null,
ContainerLauncher.EventType.CONTAINER_REMOTE_LAUNCH));
}
waitForEvents(containerLauncher, 22);
Assert.assertEquals(12, threadPool.getPoolSize());
Assert.assertNull(containerLauncher.foundErrors);
containerLauncher.stop();
}
@Test
public void testPoolLimits() throws InterruptedException {
ApplicationId appId = BuilderUtils.newApplicationId(12345, 67);
ApplicationAttemptId appAttemptId = BuilderUtils.newApplicationAttemptId(
appId, 3);
JobId jobId = MRBuilderUtils.newJobId(appId, 8);
TaskId taskId = MRBuilderUtils.newTaskId(jobId, 9, TaskType.MAP);
TaskAttemptId taskAttemptId = MRBuilderUtils.newTaskAttemptId(taskId, 0);
ContainerId containerId = BuilderUtils.newContainerId(appAttemptId, 10);
AppContext context = mock(AppContext.class);
CustomContainerLauncher containerLauncher = new CustomContainerLauncher(
context);
Configuration conf = new Configuration();
conf.setInt(MRJobConfig.MR_AM_CONTAINERLAUNCHER_THREAD_COUNT_LIMIT, 12);
containerLauncher.init(conf);
containerLauncher.start();
ThreadPoolExecutor threadPool = containerLauncher.getThreadPool();
// 10 different hosts
containerLauncher.expectedCorePoolSize = ContainerLauncherImpl.INITIAL_POOL_SIZE;
for (int i = 0; i < 10; i++) {
containerLauncher.handle(new ContainerLauncherEvent(taskAttemptId,
containerId, "host" + i + ":1234", null,
ContainerLauncher.EventType.CONTAINER_REMOTE_LAUNCH));
}
waitForEvents(containerLauncher, 10);
Assert.assertEquals(10, threadPool.getPoolSize());
Assert.assertNull(containerLauncher.foundErrors);
// 4 more different hosts, but thread pool size should be capped at 12
containerLauncher.expectedCorePoolSize = 12 ;
for (int i = 1; i <= 4; i++) {
containerLauncher.handle(new ContainerLauncherEvent(taskAttemptId,
containerId, "host1" + i + ":1234", null,
ContainerLauncher.EventType.CONTAINER_REMOTE_LAUNCH));
}
waitForEvents(containerLauncher, 12);
Assert.assertEquals(12, threadPool.getPoolSize());
Assert.assertNull(containerLauncher.foundErrors);
// Make some threads ideal so that remaining events are also done.
containerLauncher.finishEventHandling = true;
waitForEvents(containerLauncher, 14);
Assert.assertEquals(12, threadPool.getPoolSize());
Assert.assertNull(containerLauncher.foundErrors);
containerLauncher.stop();
}
private void waitForEvents(CustomContainerLauncher containerLauncher,
int expectedNumEvents) throws InterruptedException {
int timeOut = 20;
while (expectedNumEvents != containerLauncher.numEventsProcessed
|| timeOut++ < 20) {
LOG.info("Waiting for number of events to become " + expectedNumEvents
+ ". It is now " + containerLauncher.numEventsProcessed);
Thread.sleep(1000);
}
Assert
.assertEquals(expectedNumEvents, containerLauncher.numEventsProcessed);
}
@Test
public void testSlowNM() throws Exception {
test(false);
}
@Test
public void testSlowNMWithInterruptsSwallowed() throws Exception {
test(true);
}
private void test(boolean swallowInterrupts) throws Exception {
MRApp app = new MRAppWithSlowNM(swallowInterrupts);
Configuration conf = new Configuration();
int maxAttempts = 1;
conf.setInt(MRJobConfig.MAP_MAX_ATTEMPTS, maxAttempts);
conf.setBoolean(MRJobConfig.JOB_UBERTASK_ENABLE, false);
// Set low timeout for NM commands
conf.setInt(ContainerLauncher.MR_AM_NM_COMMAND_TIMEOUT, 3000);
Job job = app.submit(conf);
app.waitForState(job, JobState.RUNNING);
Map<TaskId, Task> tasks = job.getTasks();
Assert.assertEquals("Num tasks is not correct", 1, tasks.size());
Task task = tasks.values().iterator().next();
app.waitForState(task, TaskState.SCHEDULED);
Map<TaskAttemptId, TaskAttempt> attempts = tasks.values().iterator()
.next().getAttempts();
Assert.assertEquals("Num attempts is not correct", maxAttempts, attempts
.size());
TaskAttempt attempt = attempts.values().iterator().next();
app.waitForState(attempt, TaskAttemptState.ASSIGNED);
app.waitForState(job, JobState.FAILED);
String diagnostics = attempt.getDiagnostics().toString();
LOG.info("attempt.getDiagnostics: " + diagnostics);
if (swallowInterrupts) {
Assert.assertEquals("[Container launch failed for "
+ "container_0_0000_01_000000 : Start-container for "
+ "container_0_0000_01_000000 got interrupted. Returning.]",
diagnostics);
} else {
Assert.assertTrue(diagnostics.contains("Container launch failed for "
+ "container_0_0000_01_000000 : "));
Assert.assertTrue(diagnostics
.contains(": java.lang.InterruptedException"));
}
app.stop();
}
private final class CustomContainerLauncher extends ContainerLauncherImpl {
private volatile int expectedCorePoolSize = 0;
private volatile int numEventsProcessed = 0;
private volatile String foundErrors = null;
private volatile boolean finishEventHandling;
private CustomContainerLauncher(AppContext context) {
super(context);
}
public ThreadPoolExecutor getThreadPool() {
return super.launcherPool;
}
protected ContainerLauncherImpl.EventProcessor createEventProcessor(
ContainerLauncherEvent event) {
// At this point of time, the EventProcessor is being created and so no
// additional threads would have been created.
// Core-pool-size should have increased by now.
if (expectedCorePoolSize != launcherPool.getCorePoolSize()) {
foundErrors = "Expected " + expectedCorePoolSize + " but found "
+ launcherPool.getCorePoolSize();
}
return new ContainerLauncherImpl.EventProcessor(event) {
@Override
public void run() {
// do nothing substantial
numEventsProcessed++;
// Stall
synchronized(this) {
try {
while(!finishEventHandling) {
wait(1000);
}
} catch (InterruptedException e) {
;
}
}
}
};
}
}
private static class MRAppWithSlowNM extends MRApp {
final boolean swallowInterrupts;
public MRAppWithSlowNM(boolean swallowInterrupts) {
super(1, 0, false, "TestContainerLauncher", true);
this.swallowInterrupts = swallowInterrupts;
}
@Override
protected ContainerLauncher createContainerLauncher(AppContext context) {
return new ContainerLauncherImpl(context) {
@Override
protected ContainerManager getCMProxy(ContainerId containerID,
String containerManagerBindAddr, ContainerToken containerToken)
throws IOException {
try {
synchronized (this) {
wait(); // Just hang the thread simulating a very slow NM.
}
} catch (InterruptedException e) {
LOG.info(e);
if (!MRAppWithSlowNM.this.swallowInterrupts) {
throw new IOException(e);
}
Thread.currentThread().interrupt();
}
return null;
}
};
};
}
}