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YARN-2073. Fair Scheduler: Add a utilization threshold to prevent preempting resources when cluster is free (Karthik Kambatla via Sandy Ryza) 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1597209 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Sanford Ryza 2014-05-23 22:52:46 +00:00
parent 7f0724dddb
commit a00b2d4f37
7 changed files with 397 additions and 147 deletions
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3
hadoop-yarn-project/CHANGES.txt
View File

@ -104,6 +104,9 @@ Release 2.5.0 - UNRELEASED
YARN-2059. Added admin ACLs support to Timeline Server. (Zhijie Shen via
vinodkv)
YARN-2073. Fair Scheduler: Add a utilization threshold to prevent preempting
resources when cluster is free (Karthik Kambatla via Sandy Ryza)
OPTIMIZATIONS

32
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairScheduler.java
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@ -148,7 +148,11 @@ public class FairScheduler extends
// Time we last ran preemptTasksIfNecessary
private long lastPreemptCheckTime;
// How often tasks are preempted
// Preemption related variables
protected boolean preemptionEnabled;
protected float preemptionUtilizationThreshold;
// How often tasks are preempted
protected long preemptionInterval;
// ms to wait before force killing stuff (must be longer than a couple
@ -158,7 +162,6 @@ public class FairScheduler extends
// Containers whose AMs have been warned that they will be preempted soon.
private List<RMContainer> warnedContainers = new ArrayList<RMContainer>();
protected boolean preemptionEnabled;
protected boolean sizeBasedWeight; // Give larger weights to larger jobs
protected WeightAdjuster weightAdjuster; // Can be null for no weight adjuster
protected boolean continuousSchedulingEnabled; // Continuous Scheduling enabled or not
@ -318,7 +321,7 @@ public class FairScheduler extends
* and then select the right ones using preemptTasks.
*/
protected synchronized void preemptTasksIfNecessary() {
if (!preemptionEnabled) {
if (!shouldAttemptPreemption()) {
return;
}
@ -328,10 +331,9 @@ public class FairScheduler extends
}
lastPreemptCheckTime = curTime;
Resource resToPreempt = Resources.none();
Resource resToPreempt = Resources.clone(Resources.none());
for (FSLeafQueue sched : queueMgr.getLeafQueues()) {
resToPreempt = Resources.add(resToPreempt, resToPreempt(sched, curTime));
Resources.addTo(resToPreempt, resToPreempt(sched, curTime));
}
if (Resources.greaterThan(RESOURCE_CALCULATOR, clusterResource, resToPreempt,
Resources.none())) {
@ -1067,6 +1069,22 @@ public class FairScheduler extends
clusterResource, rootMetrics.getAllocatedResources()));
}
/**
* Check if preemption is enabled and the utilization threshold for
* preemption is met.
*
* @return true if preemption should be attempted, false otherwise.
*/
private boolean shouldAttemptPreemption() {
if (preemptionEnabled) {
return (preemptionUtilizationThreshold < Math.max(
(float) rootMetrics.getAvailableMB() / clusterResource.getMemory(),
(float) rootMetrics.getAvailableVirtualCores() /
clusterResource.getVirtualCores()));
}
return false;
}
@Override
public QueueMetrics getRootQueueMetrics() {
return rootMetrics;
@ -1172,6 +1190,8 @@ public class FairScheduler extends
nodeLocalityDelayMs = this.conf.getLocalityDelayNodeMs();
rackLocalityDelayMs = this.conf.getLocalityDelayRackMs();
preemptionEnabled = this.conf.getPreemptionEnabled();
preemptionUtilizationThreshold =
this.conf.getPreemptionUtilizationThreshold();
assignMultiple = this.conf.getAssignMultiple();
maxAssign = this.conf.getMaxAssign();
sizeBasedWeight = this.conf.getSizeBasedWeight();

8
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairSchedulerConfiguration.java
View File

@ -101,6 +101,10 @@ public class FairSchedulerConfiguration extends Configuration {
/** Whether preemption is enabled. */
protected static final String PREEMPTION = CONF_PREFIX + "preemption";
protected static final boolean DEFAULT_PREEMPTION = false;
protected static final String PREEMPTION_THRESHOLD =
CONF_PREFIX + "preemption.cluster-utilization-threshold";
protected static final float DEFAULT_PREEMPTION_THRESHOLD = 0.8f;
protected static final String PREEMPTION_INTERVAL = CONF_PREFIX + "preemptionInterval";
protected static final int DEFAULT_PREEMPTION_INTERVAL = 5000;
@ -185,6 +189,10 @@ public class FairSchedulerConfiguration extends Configuration {
return getBoolean(PREEMPTION, DEFAULT_PREEMPTION);
}
public float getPreemptionUtilizationThreshold() {
return getFloat(PREEMPTION_THRESHOLD, DEFAULT_PREEMPTION_THRESHOLD);
}
public boolean getAssignMultiple() {
return getBoolean(ASSIGN_MULTIPLE, DEFAULT_ASSIGN_MULTIPLE);
}

172
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FairSchedulerTestBase.java Normal file
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@ -0,0 +1,172 @@
/**
* 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.yarn.server.resourcemanager.scheduler.fair;
import org.apache.hadoop.conf.Configuration;
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.Priority;
import org.apache.hadoop.yarn.api.records.ResourceRequest;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.factories.RecordFactory;
import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
import org.apache.hadoop.yarn.server.resourcemanager.ResourceManager;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
import org.apache.hadoop.yarn.server.utils.BuilderUtils;
import org.apache.hadoop.yarn.util.Clock;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
public class FairSchedulerTestBase {
protected static class MockClock implements Clock {
private long time = 0;
@Override
public long getTime() {
return time;
}
public void tick(int seconds) {
time = time + seconds * 1000;
}
}
protected final static String TEST_DIR =
new File(System.getProperty("test.build.data", "/tmp")).getAbsolutePath();
private static RecordFactory
recordFactory = RecordFactoryProvider.getRecordFactory(null);
protected int APP_ID = 1; // Incrementing counter for scheduling apps
protected int ATTEMPT_ID = 1; // Incrementing counter for scheduling attempts
protected Configuration conf;
protected FairScheduler scheduler;
protected ResourceManager resourceManager;
// Helper methods
protected Configuration createConfiguration() {
Configuration conf = new YarnConfiguration();
conf.setClass(YarnConfiguration.RM_SCHEDULER, FairScheduler.class,
ResourceScheduler.class);
conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB, 0);
conf.setInt(FairSchedulerConfiguration.RM_SCHEDULER_INCREMENT_ALLOCATION_MB,
1024);
conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_MB, 10240);
conf.setBoolean(FairSchedulerConfiguration.ASSIGN_MULTIPLE, false);
conf.setFloat(FairSchedulerConfiguration.PREEMPTION_THRESHOLD, 0f);
return conf;
}
protected ApplicationAttemptId createAppAttemptId(int appId, int attemptId) {
ApplicationId appIdImpl = ApplicationId.newInstance(0, appId);
return ApplicationAttemptId.newInstance(appIdImpl, attemptId);
}
protected ResourceRequest createResourceRequest(
int memory, String host, int priority, int numContainers,
boolean relaxLocality) {
return createResourceRequest(memory, 1, host, priority, numContainers,
relaxLocality);
}
protected ResourceRequest createResourceRequest(
int memory, int vcores, String host, int priority, int numContainers,
boolean relaxLocality) {
ResourceRequest request = recordFactory.newRecordInstance(ResourceRequest.class);
request.setCapability(BuilderUtils.newResource(memory, vcores));
request.setResourceName(host);
request.setNumContainers(numContainers);
Priority prio = recordFactory.newRecordInstance(Priority.class);
prio.setPriority(priority);
request.setPriority(prio);
request.setRelaxLocality(relaxLocality);
return request;
}
/**
* Creates a single container priority-1 request and submits to
* scheduler.
*/
protected ApplicationAttemptId createSchedulingRequest(
int memory, String queueId, String userId) {
return createSchedulingRequest(memory, queueId, userId, 1);
}
protected ApplicationAttemptId createSchedulingRequest(
int memory, int vcores, String queueId, String userId) {
return createSchedulingRequest(memory, vcores, queueId, userId, 1);
}
protected ApplicationAttemptId createSchedulingRequest(
int memory, String queueId, String userId, int numContainers) {
return createSchedulingRequest(memory, queueId, userId, numContainers, 1);
}
protected ApplicationAttemptId createSchedulingRequest(
int memory, int vcores, String queueId, String userId, int numContainers) {
return createSchedulingRequest(memory, vcores, queueId, userId, numContainers, 1);
}
protected ApplicationAttemptId createSchedulingRequest(
int memory, String queueId, String userId, int numContainers, int priority) {
return createSchedulingRequest(memory, 1, queueId, userId, numContainers,
priority);
}
protected ApplicationAttemptId createSchedulingRequest(
int memory, int vcores, String queueId, String userId, int numContainers,
int priority) {
ApplicationAttemptId id = createAppAttemptId(this.APP_ID++, this.ATTEMPT_ID++);
scheduler.addApplication(id.getApplicationId(), queueId, userId);
// This conditional is for testAclSubmitApplication where app is rejected
// and no app is added.
if (scheduler.getSchedulerApplications().containsKey(id.getApplicationId())) {
scheduler.addApplicationAttempt(id, false);
}
List<ResourceRequest> ask = new ArrayList<ResourceRequest>();
ResourceRequest request = createResourceRequest(memory, vcores, ResourceRequest.ANY,
priority, numContainers, true);
ask.add(request);
scheduler.allocate(id, ask, new ArrayList<ContainerId>(), null, null);
return id;
}
protected void createSchedulingRequestExistingApplication(
int memory, int priority, ApplicationAttemptId attId) {
ResourceRequest request = createResourceRequest(memory, ResourceRequest.ANY,
priority, 1, true);
createSchedulingRequestExistingApplication(request, attId);
}
protected void createSchedulingRequestExistingApplication(
int memory, int vcores, int priority, ApplicationAttemptId attId) {
ResourceRequest request = createResourceRequest(memory, vcores, ResourceRequest.ANY,
priority, 1, true);
createSchedulingRequestExistingApplication(request, attId);
}
protected void createSchedulingRequestExistingApplication(
ResourceRequest request, ApplicationAttemptId attId) {
List<ResourceRequest> ask = new ArrayList<ResourceRequest>();
ask.add(request);
scheduler.allocate(attId, ask, new ArrayList<ContainerId>(), null, null);
}
}

145
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairScheduler.java
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@ -55,7 +55,6 @@ import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerLaunchContext;
import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
import org.apache.hadoop.yarn.api.records.NodeId;
import org.apache.hadoop.yarn.api.records.Priority;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.api.records.ResourceRequest;
import org.apache.hadoop.yarn.api.records.impl.pb.ApplicationSubmissionContextPBImpl;
@ -63,8 +62,6 @@ import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.event.AsyncDispatcher;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.exceptions.YarnRuntimeException;
import org.apache.hadoop.yarn.factories.RecordFactory;
import org.apache.hadoop.yarn.factory.providers.RecordFactoryProvider;
import org.apache.hadoop.yarn.server.resourcemanager.ApplicationMasterService;
import org.apache.hadoop.yarn.server.resourcemanager.MockNodes;
import org.apache.hadoop.yarn.server.resourcemanager.RMContext;
@ -94,7 +91,6 @@ import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeUpdateS
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.DominantResourceFairnessPolicy;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair.policies.FifoPolicy;
import org.apache.hadoop.yarn.server.utils.BuilderUtils;
import org.apache.hadoop.yarn.util.Clock;
import org.apache.hadoop.yarn.util.resource.Resources;
import org.junit.After;
import org.junit.Assert;
@ -105,46 +101,14 @@ import org.xml.sax.SAXException;
import com.google.common.collect.Sets;
@SuppressWarnings("unchecked")
public class TestFairScheduler {
public class TestFairScheduler extends FairSchedulerTestBase {
private final static String ALLOC_FILE =
new File(TEST_DIR, "test-queues").getAbsolutePath();
static class MockClock implements Clock {
private long time = 0;
@Override
public long getTime() {
return time;
}
public void tick(int seconds) {
time = time + seconds * 1000;
}
}
final static String TEST_DIR = new File(System.getProperty("test.build.data",
"/tmp")).getAbsolutePath();
final static String ALLOC_FILE = new File(TEST_DIR,
"test-queues").getAbsolutePath();
private FairScheduler scheduler;
private ResourceManager resourceManager;
private Configuration conf;
private static RecordFactory recordFactory = RecordFactoryProvider.getRecordFactory(null);
private int APP_ID = 1; // Incrementing counter for schedling apps
private int ATTEMPT_ID = 1; // Incrementing counter for scheduling attempts
// HELPER METHODS
@Before
public void setUp() throws IOException {
scheduler = new FairScheduler();
conf = createConfiguration();
conf.setInt(YarnConfiguration.RM_SCHEDULER_MINIMUM_ALLOCATION_MB, 0);
conf.setInt(FairSchedulerConfiguration.RM_SCHEDULER_INCREMENT_ALLOCATION_MB,
1024);
conf.setInt(YarnConfiguration.RM_SCHEDULER_MAXIMUM_ALLOCATION_MB, 10240);
// All tests assume only one assignment per node update
conf.set(FairSchedulerConfiguration.ASSIGN_MULTIPLE, "false");
resourceManager = new ResourceManager();
resourceManager.init(conf);
@ -198,107 +162,6 @@ public class TestFairScheduler {
}
}
private Configuration createConfiguration() {
Configuration conf = new YarnConfiguration();
conf.setClass(YarnConfiguration.RM_SCHEDULER, FairScheduler.class,
ResourceScheduler.class);
return conf;
}
private ApplicationAttemptId createAppAttemptId(int appId, int attemptId) {
ApplicationId appIdImpl = ApplicationId.newInstance(0, appId);
ApplicationAttemptId attId =
ApplicationAttemptId.newInstance(appIdImpl, attemptId);
return attId;
}
private ResourceRequest createResourceRequest(int memory, String host,
int priority, int numContainers, boolean relaxLocality) {
return createResourceRequest(memory, 1, host, priority, numContainers,
relaxLocality);
}
private ResourceRequest createResourceRequest(int memory, int vcores, String host,
int priority, int numContainers, boolean relaxLocality) {
ResourceRequest request = recordFactory.newRecordInstance(ResourceRequest.class);
request.setCapability(BuilderUtils.newResource(memory, vcores));
request.setResourceName(host);
request.setNumContainers(numContainers);
Priority prio = recordFactory.newRecordInstance(Priority.class);
prio.setPriority(priority);
request.setPriority(prio);
request.setRelaxLocality(relaxLocality);
return request;
}
/**
* Creates a single container priority-1 request and submits to
* scheduler.
*/
private ApplicationAttemptId createSchedulingRequest(int memory, String queueId,
String userId) {
return createSchedulingRequest(memory, queueId, userId, 1);
}
private ApplicationAttemptId createSchedulingRequest(int memory, int vcores,
String queueId, String userId) {
return createSchedulingRequest(memory, vcores, queueId, userId, 1);
}
private ApplicationAttemptId createSchedulingRequest(int memory, String queueId,
String userId, int numContainers) {
return createSchedulingRequest(memory, queueId, userId, numContainers, 1);
}
private ApplicationAttemptId createSchedulingRequest(int memory, int vcores,
String queueId, String userId, int numContainers) {
return createSchedulingRequest(memory, vcores, queueId, userId, numContainers, 1);
}
private ApplicationAttemptId createSchedulingRequest(int memory, String queueId,
String userId, int numContainers, int priority) {
return createSchedulingRequest(memory, 1, queueId, userId, numContainers,
priority);
}
private ApplicationAttemptId createSchedulingRequest(int memory, int vcores,
String queueId, String userId, int numContainers, int priority) {
ApplicationAttemptId id = createAppAttemptId(this.APP_ID++, this.ATTEMPT_ID++);
scheduler.addApplication(id.getApplicationId(), queueId, userId);
// This conditional is for testAclSubmitApplication where app is rejected
// and no app is added.
if (scheduler.getSchedulerApplications().containsKey(id.getApplicationId())) {
scheduler.addApplicationAttempt(id, false);
}
List<ResourceRequest> ask = new ArrayList<ResourceRequest>();
ResourceRequest request = createResourceRequest(memory, vcores, ResourceRequest.ANY,
priority, numContainers, true);
ask.add(request);
scheduler.allocate(id, ask, new ArrayList<ContainerId>(), null, null);
return id;
}
private void createSchedulingRequestExistingApplication(int memory, int priority,
ApplicationAttemptId attId) {
ResourceRequest request = createResourceRequest(memory, ResourceRequest.ANY,
priority, 1, true);
createSchedulingRequestExistingApplication(request, attId);
}
private void createSchedulingRequestExistingApplication(int memory, int vcores,
int priority, ApplicationAttemptId attId) {
ResourceRequest request = createResourceRequest(memory, vcores, ResourceRequest.ANY,
priority, 1, true);
createSchedulingRequestExistingApplication(request, attId);
}
private void createSchedulingRequestExistingApplication(ResourceRequest request,
ApplicationAttemptId attId) {
List<ResourceRequest> ask = new ArrayList<ResourceRequest>();
ask.add(request);
scheduler.allocate(attId, ask, new ArrayList<ContainerId>(), null, null);
}
// TESTS
@Test(timeout=2000)
@ -1455,7 +1318,7 @@ public class TestFairScheduler {
assertEquals(
1536, scheduler.resToPreempt(schedD, clock.getTime()).getMemory());
}
@Test (timeout = 5000)
public void testMultipleContainersWaitingForReservation() throws IOException {
scheduler.reinitialize(conf, resourceManager.getRMContext());

178
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFairSchedulerPreemption.java Normal file
View File

@ -0,0 +1,178 @@
/**
* 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.yarn.server.resourcemanager.scheduler.fair;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.conf.YarnConfiguration;
import org.apache.hadoop.yarn.server.resourcemanager.MockNodes;
import org.apache.hadoop.yarn.server.resourcemanager.MockRM;
import org.apache.hadoop.yarn.server.resourcemanager.rmnode.RMNode;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeAddedSchedulerEvent;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.event.NodeUpdateSchedulerEvent;
import org.apache.hadoop.yarn.util.resource.Resources;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Collection;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
public class TestFairSchedulerPreemption extends FairSchedulerTestBase {
private final static String ALLOC_FILE = new File(TEST_DIR,
TestFairSchedulerPreemption.class.getName() + ".xml").getAbsolutePath();
private MockClock clock;
private static class StubbedFairScheduler extends FairScheduler {
public int lastPreemptMemory = -1;
@Override
protected void preemptResources(
Collection<FSLeafQueue> scheds, Resource toPreempt) {
lastPreemptMemory = toPreempt.getMemory();
}
public void resetLastPreemptResources() {
lastPreemptMemory = -1;
}
}
@Override
protected Configuration createConfiguration() {
Configuration conf = super.createConfiguration();
conf.setClass(YarnConfiguration.RM_SCHEDULER, StubbedFairScheduler.class,
ResourceScheduler.class);
conf.setBoolean(FairSchedulerConfiguration.PREEMPTION, true);
conf.set(FairSchedulerConfiguration.ALLOCATION_FILE, ALLOC_FILE);
return conf;
}
@Before
public void setup() throws IOException {
conf = createConfiguration();
clock = new MockClock();
}
@After
public void teardown() {
if (resourceManager != null) {
resourceManager.stop();
resourceManager = null;
}
conf = null;
}
private void startResourceManager(float utilizationThreshold) {
conf.setFloat(FairSchedulerConfiguration.PREEMPTION_THRESHOLD,
utilizationThreshold);
resourceManager = new MockRM(conf);
resourceManager.start();
assertTrue(
resourceManager.getResourceScheduler() instanceof StubbedFairScheduler);
scheduler = (FairScheduler)resourceManager.getResourceScheduler();
scheduler.setClock(clock);
scheduler.UPDATE_INTERVAL = 60 * 1000;
}
private void registerNodeAndSubmitApp(
int memory, int vcores, int appContainers, int appMemory) {
RMNode node1 = MockNodes.newNodeInfo(
1, Resources.createResource(memory, vcores), 1, "node1");
NodeAddedSchedulerEvent nodeEvent1 = new NodeAddedSchedulerEvent(node1);
scheduler.handle(nodeEvent1);
assertEquals("Incorrect amount of resources in the cluster",
memory, scheduler.rootMetrics.getAvailableMB());
assertEquals("Incorrect amount of resources in the cluster",
vcores, scheduler.rootMetrics.getAvailableVirtualCores());
createSchedulingRequest(appMemory, "queueA", "user1", appContainers);
scheduler.update();
// Sufficient node check-ins to fully schedule containers
for (int i = 0; i < 3; i++) {
NodeUpdateSchedulerEvent nodeUpdate1 = new NodeUpdateSchedulerEvent(node1);
scheduler.handle(nodeUpdate1);
}
assertEquals("app1's request is not met",
memory - appContainers * appMemory,
scheduler.rootMetrics.getAvailableMB());
}
@Test
public void testPreemptionWithFreeResources() throws Exception {
PrintWriter out = new PrintWriter(new FileWriter(ALLOC_FILE));
out.println("<?xml version=\"1.0\"?>");
out.println("<allocations>");
out.println("<queue name=\"default\">");
out.println("<maxResources>0mb,0vcores</maxResources>");
out.println("</queue>");
out.println("<queue name=\"queueA\">");
out.println("<weight>1</weight>");
out.println("<minResources>1024mb,0vcores</minResources>");
out.println("</queue>");
out.println("<queue name=\"queueB\">");
out.println("<weight>1</weight>");
out.println("<minResources>1024mb,0vcores</minResources>");
out.println("</queue>");
out.print("<defaultMinSharePreemptionTimeout>5</defaultMinSharePreemptionTimeout>");
out.print("<fairSharePreemptionTimeout>10</fairSharePreemptionTimeout>");
out.println("</allocations>");
out.close();
startResourceManager(0f);
// Create node with 4GB memory and 4 vcores
registerNodeAndSubmitApp(4 * 1024, 4, 2, 1024);
// Verify submitting another request doesn't trigger preemption
createSchedulingRequest(1024, "queueB", "user1", 1, 1);
scheduler.update();
clock.tick(6);
((StubbedFairScheduler) scheduler).resetLastPreemptResources();
scheduler.preemptTasksIfNecessary();
assertEquals("preemptResources() should have been called", 1024,
((StubbedFairScheduler) scheduler).lastPreemptMemory);
resourceManager.stop();
startResourceManager(0.8f);
// Create node with 4GB memory and 4 vcores
registerNodeAndSubmitApp(4 * 1024, 4, 3, 1024);
// Verify submitting another request doesn't trigger preemption
createSchedulingRequest(1024, "queueB", "user1", 1, 1);
scheduler.update();
clock.tick(6);
((StubbedFairScheduler) scheduler).resetLastPreemptResources();
scheduler.preemptTasksIfNecessary();
assertEquals("preemptResources() should not have been called", -1,
((StubbedFairScheduler) scheduler).lastPreemptMemory);
}
}

6
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-site/src/site/apt/FairScheduler.apt.vm
View File

@ -156,6 +156,12 @@ Properties that can be placed in yarn-site.xml
* Whether to use preemption. Note that preemption is experimental in the current
version. Defaults to false.
* <<<yarn.scheduler.fair.preemption.cluster-utilization-threshold>>>
* The utilization threshold after which preemption kicks in. The
utilization is computed as the maximum ratio of usage to capacity among
all resources. Defaults to 0.8f.
* <<<yarn.scheduler.fair.sizebasedweight>>>
* Whether to assign shares to individual apps based on their size, rather than