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YARN-6895. [FairScheduler] Preemption reservation may cause regular reservation leaks. (Miklos Szegedi via Yufei Gu)

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This commit is contained in:
Yufei Gu 2017-08-02 09:25:19 -07:00
parent 48899134d2
commit 45535f8afa
4 changed files with 119 additions and 27 deletions
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17
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSAppAttempt.java
View File

@ -554,6 +554,15 @@ void resetMinshareStarvation() {
this.minshareStarvation = Resources.none();
}
/**
* Get last computed minshare starvation.
*
* @return last computed minshare starvation
*/
Resource getMinshareStarvation() {
return minshareStarvation;
}
void trackContainerForPreemption(RMContainer container) {
synchronized (preemptionVariablesLock) {
if (containersToPreempt.add(container)) {
@ -842,7 +851,10 @@ private Resource assignContainer(
}
// The desired container won't fit here, so reserve
// Reserve only, if app does not wait for preempted resources on the node,
// otherwise we may end up with duplicate reservations
if (isReservable(capability) &&
!node.isPreemptedForApp(this) &&
reserve(pendingAsk.getPerAllocationResource(), node, reservedContainer,
type, schedulerKey)) {
updateAMDiagnosticMsg(capability, " exceeds the available resources of "
@ -1110,7 +1122,8 @@ Resource fairShareStarvation() {
}
if (!starved ||
now - lastTimeAtFairShare < getQueue().getFairSharePreemptionTimeout()) {
now - lastTimeAtFairShare <
getQueue().getFairSharePreemptionTimeout()) {
fairshareStarvation = Resources.none();
} else {
// The app has been starved for longer than preemption-timeout.
@ -1138,7 +1151,7 @@ boolean isStarvedForFairShare() {
}
/**
* Is application starved for fairshare or minshare
* Is application starved for fairshare or minshare.
*/
boolean isStarved() {
return isStarvedForFairShare() || !Resources.isNone(minshareStarvation);

60
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/FSSchedulerNode.java
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@ -19,6 +19,7 @@
package org.apache.hadoop.yarn.server.resourcemanager.scheduler.fair;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Lists;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.classification.InterfaceAudience.Private;
@ -35,12 +36,15 @@
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListSet;
/**
* Fair Scheduler specific node features.
*/
@Private
@Unstable
public class FSSchedulerNode extends SchedulerNode {
@ -122,7 +126,8 @@ public synchronized void unreserveResource(
SchedulerApplicationAttempt application) {
// Cannot unreserve for wrong application...
ApplicationAttemptId reservedApplication =
getReservedContainer().getContainer().getId().getApplicationAttemptId();
getReservedContainer().getContainer().getId()
.getApplicationAttemptId();
if (!reservedApplication.equals(
application.getApplicationAttemptId())) {
throw new IllegalStateException("Trying to unreserve " +
@ -151,20 +156,37 @@ synchronized LinkedHashMap<FSAppAttempt, Resource> getPreemptionList() {
return new LinkedHashMap<>(resourcesPreemptedForApp);
}
/**
* Returns whether a preemption is tracked on the node for the specified app.
* @return if preempted containers are reserved for the app
*/
synchronized boolean isPreemptedForApp(FSAppAttempt app){
return resourcesPreemptedForApp.containsKey(app);
}
/**
* Remove apps that have their preemption requests fulfilled.
*/
private synchronized void cleanupPreemptionList() {
Iterator<Map.Entry<FSAppAttempt, Resource>> iterator =
resourcesPreemptedForApp.entrySet().iterator();
while(iterator.hasNext()) {
FSAppAttempt app = iterator.next().getKey();
if (app.isStopped() || !app.isStarved()) {
private void cleanupPreemptionList() {
// Synchronize separately to avoid potential deadlocks
// This may cause delayed deletion of reservations
LinkedList<FSAppAttempt> candidates;
synchronized (this) {
candidates = Lists.newLinkedList(resourcesPreemptedForApp.keySet());
}
for (FSAppAttempt app : candidates) {
if (app.isStopped() || !app.isStarved() ||
(Resources.isNone(app.getFairshareStarvation()) &&
Resources.isNone(app.getMinshareStarvation()))) {
// App does not need more resources
synchronized (this) {
Resource removed = resourcesPreemptedForApp.remove(app);
if (removed != null) {
Resources.subtractFrom(totalResourcesPreempted,
resourcesPreemptedForApp.get(app));
removed);
appIdToAppMap.remove(app.getApplicationAttemptId());
iterator.remove();
}
}
}
}
}
@ -180,15 +202,23 @@ private synchronized void cleanupPreemptionList() {
void addContainersForPreemption(Collection<RMContainer> containers,
FSAppAttempt app) {
appIdToAppMap.putIfAbsent(app.getApplicationAttemptId(), app);
resourcesPreemptedForApp.putIfAbsent(app, Resource.newInstance(0, 0));
Resource appReserved = resourcesPreemptedForApp.get(app);
Resource appReserved = Resources.createResource(0);
for(RMContainer container : containers) {
containersForPreemption.add(container);
if(containersForPreemption.add(container)) {
Resources.addTo(appReserved, container.getAllocatedResource());
}
}
synchronized (this) {
if (!Resources.isNone(appReserved)) {
Resources.addTo(totalResourcesPreempted,
container.getAllocatedResource());
appReserved);
appIdToAppMap.putIfAbsent(app.getApplicationAttemptId(), app);
resourcesPreemptedForApp.
putIfAbsent(app, Resource.newInstance(0, 0));
Resources.addTo(resourcesPreemptedForApp.get(app), appReserved);
}
}
}

9
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
View File

@ -985,25 +985,22 @@ private boolean shouldContinueAssigning(int containers,
* Assign preempted containers to the applications that have reserved
* resources for preempted containers.
* @param node Node to check
* @return assignment has occurred
*/
static boolean assignPreemptedContainers(FSSchedulerNode node) {
boolean assignedAny = false;
static void assignPreemptedContainers(FSSchedulerNode node) {
for (Entry<FSAppAttempt, Resource> entry :
node.getPreemptionList().entrySet()) {
FSAppAttempt app = entry.getKey();
Resource preemptionPending = Resources.clone(entry.getValue());
while (!app.isStopped() && !Resources.isNone(preemptionPending)) {
Resource assigned = app.assignContainer(node);
if (Resources.isNone(assigned)) {
if (Resources.isNone(assigned) ||
assigned.equals(FairScheduler.CONTAINER_RESERVED)) {
// Fail to assign, let's not try further
break;
}
assignedAny = true;
Resources.subtractFromNonNegative(preemptionPending, assigned);
}
}
return assignedAny;
}
@VisibleForTesting

52
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/test/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/fair/TestFSSchedulerNode.java
View File

@ -31,6 +31,7 @@
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;
import static org.junit.Assert.assertTrue;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;
@ -68,6 +69,16 @@ private RMContainer createContainer(
when(container.getExecutionType()).thenReturn(ExecutionType.GUARANTEED);
when(container.getAllocatedResource()).
thenReturn(Resources.clone(request));
when(container.compareTo(any())).thenAnswer(new Answer<Integer>() {
public Integer answer(InvocationOnMock invocation) {
return
Long.compare(
((RMContainer)invocation.getMock()).getContainerId()
.getContainerId(),
((RMContainer)invocation.getArguments()[0]).getContainerId()
.getContainerId());
}
});
containers.add(container);
return container;
}
@ -224,6 +235,47 @@ public void testSimplePreemption() {
finalValidation(schedulerNode);
}
/**
* Allocate a single container twice and release.
*/
@Test
public void testDuplicatePreemption() {
RMNode node = createNode();
FSSchedulerNode schedulerNode = new FSSchedulerNode(node, false);
// Launch containers and saturate the cluster
saturateCluster(schedulerNode);
assertEquals("Container should be allocated",
Resources.multiply(containers.get(0).getContainer().getResource(),
containers.size()),
schedulerNode.getAllocatedResource());
// Request preemption twice
FSAppAttempt starvingApp = createStarvingApp(schedulerNode,
Resource.newInstance(1024, 1));
schedulerNode.addContainersForPreemption(
Collections.singletonList(containers.get(0)), starvingApp);
schedulerNode.addContainersForPreemption(
Collections.singletonList(containers.get(0)), starvingApp);
assertEquals(
"No resource amount should be reserved for preemptees",
containers.get(0).getAllocatedResource(),
schedulerNode.getTotalReserved());
// Preemption occurs release one container
schedulerNode.releaseContainer(containers.get(0).getContainerId(), true);
allocateContainers(schedulerNode);
assertEquals("Container should be allocated",
schedulerNode.getTotalResource(),
schedulerNode.getAllocatedResource());
// Release all remaining containers
for (int i = 1; i < containers.size(); ++i) {
schedulerNode.releaseContainer(containers.get(i).getContainerId(), true);
}
finalValidation(schedulerNode);
}
/**
* Allocate and release three containers requested by two apps.
*/