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* 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.reservation;
import org.apache.hadoop.yarn.api.records.ApplicationAttemptId;
import org.apache.hadoop.yarn.api.records.ReservationId;
import org.apache.hadoop.yarn.api.records.Resource;
import org.apache.hadoop.yarn.exceptions.YarnException;
import org.apache.hadoop.yarn.server.resourcemanager.reservation.exceptions.PlanningException;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.Queue;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.ResourceScheduler;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.YarnScheduler;
import org.apache.hadoop.yarn.server.resourcemanager.scheduler.common.QueueEntitlement;
import org.apache.hadoop.yarn.util.Clock;
import org.apache.hadoop.yarn.util.resource.Resources;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
public abstract class AbstractSchedulerPlanFollower implements PlanFollower {
private static final Logger LOG = LoggerFactory
.getLogger(CapacitySchedulerPlanFollower.class);
protected Collection plans = new ArrayList();
protected YarnScheduler scheduler;
protected Clock clock;
@Override
public void init(Clock clock, ResourceScheduler sched, Collection plans) {
this.clock = clock;
this.scheduler = sched;
this.plans.addAll(plans);
}
@Override
public synchronized void run() {
for (Plan plan : plans) {
synchronizePlan(plan);
}
}
@Override
public synchronized void setPlans(Collection plans) {
this.plans.clear();
this.plans.addAll(plans);
}
@Override
public synchronized void synchronizePlan(Plan plan) {
String planQueueName = plan.getQueueName();
if (LOG.isDebugEnabled()) {
LOG.debug("Running plan follower edit policy for plan: " + planQueueName);
}
// align with plan step
long step = plan.getStep();
long now = clock.getTime();
if (now % step != 0) {
now += step - (now % step);
}
Queue planQueue = getPlanQueue(planQueueName);
if (planQueue == null) return;
// first we publish to the plan the current availability of resources
Resource clusterResources = scheduler.getClusterResource();
Resource planResources = getPlanResources(plan, planQueue,
clusterResources);
Set currentReservations =
plan.getReservationsAtTime(now);
Set curReservationNames = new HashSet();
Resource reservedResources = Resource.newInstance(0, 0);
int numRes = getReservedResources(now, currentReservations,
curReservationNames, reservedResources);
// create the default reservation queue if it doesnt exist
String defReservationId = getReservationIdFromQueueName(planQueueName) +
ReservationConstants.DEFAULT_QUEUE_SUFFIX;
String defReservationQueue = getReservationQueueName(planQueueName,
defReservationId);
createDefaultReservationQueue(planQueueName, planQueue,
defReservationId);
curReservationNames.add(defReservationId);
// if the resources dedicated to this plan has shrunk invoke replanner
if (arePlanResourcesLessThanReservations(clusterResources, planResources,
reservedResources)) {
try {
plan.getReplanner().plan(plan, null);
} catch (PlanningException e) {
LOG.warn("Exception while trying to replan: {}", planQueueName, e);
}
}
// identify the reservations that have expired and new reservations that
// have to be activated
List resQueues = getChildReservationQueues(planQueue);
Set expired = new HashSet();
for (Queue resQueue : resQueues) {
String resQueueName = resQueue.getQueueName();
String reservationId = getReservationIdFromQueueName(resQueueName);
if (curReservationNames.contains(reservationId)) {
// it is already existing reservation, so needed not create new
// reservation queue
curReservationNames.remove(reservationId);
} else {
// the reservation has termination, mark for cleanup
expired.add(reservationId);
}
}
// garbage collect expired reservations
cleanupExpiredQueues(planQueueName, plan.getMoveOnExpiry(), expired,
defReservationQueue);
// Add new reservations and update existing ones
float totalAssignedCapacity = 0f;
if (currentReservations != null) {
// first release all excess capacity in default queue
try {
setQueueEntitlement(planQueueName, defReservationQueue, 0f, 1.0f);
} catch (YarnException e) {
LOG.warn(
"Exception while trying to release default queue capacity for plan: {}",
planQueueName, e);
}
// sort allocations from the one giving up the most resources, to the
// one asking for the most
// avoid order-of-operation errors that temporarily violate 100%
// capacity bound
List sortedAllocations =
sortByDelta(
new ArrayList(currentReservations), now,
plan);
for (ReservationAllocation res : sortedAllocations) {
String currResId = res.getReservationId().toString();
if (curReservationNames.contains(currResId)) {
addReservationQueue(planQueueName, planQueue, currResId);
}
Resource capToAssign = res.getResourcesAtTime(now);
float targetCapacity = 0f;
if (planResources.getMemory() > 0
&& planResources.getVirtualCores() > 0) {
targetCapacity =
calculateReservationToPlanRatio(clusterResources,
planResources,
capToAssign);
}
if (LOG.isDebugEnabled()) {
LOG.debug(
"Assigning capacity of {} to queue {} with target capacity {}",
capToAssign, currResId, targetCapacity);
}
// set maxCapacity to 100% unless the job requires gang, in which
// case we stick to capacity (as running early/before is likely a
// waste of resources)
float maxCapacity = 1.0f;
if (res.containsGangs()) {
maxCapacity = targetCapacity;
}
try {
setQueueEntitlement(planQueueName, currResId, targetCapacity, maxCapacity);
} catch (YarnException e) {
LOG.warn("Exception while trying to size reservation for plan: {}",
currResId, planQueueName, e);
}
totalAssignedCapacity += targetCapacity;
}
}
// compute the default queue capacity
float defQCap = 1.0f - totalAssignedCapacity;
if (LOG.isDebugEnabled()) {
LOG.debug("PlanFollowerEditPolicyTask: total Plan Capacity: {} "
+ "currReservation: {} default-queue capacity: {}", planResources,
numRes, defQCap);
}
// set the default queue to eat-up all remaining capacity
try {
setQueueEntitlement(planQueueName, defReservationQueue, defQCap, 1.0f);
} catch (YarnException e) {
LOG.warn(
"Exception while trying to reclaim default queue capacity for plan: {}",
planQueueName, e);
}
// garbage collect finished reservations from plan
try {
plan.archiveCompletedReservations(now);
} catch (PlanningException e) {
LOG.error("Exception in archiving completed reservations: ", e);
}
LOG.info("Finished iteration of plan follower edit policy for plan: "
+ planQueueName);
// Extension: update plan with app states,
// useful to support smart replanning
}
protected String getReservationIdFromQueueName(String resQueueName) {
return resQueueName;
}
protected void setQueueEntitlement(String planQueueName, String currResId,
float targetCapacity,
float maxCapacity) throws YarnException {
String reservationQueueName = getReservationQueueName(planQueueName,
currResId);
scheduler.setEntitlement(reservationQueueName, new QueueEntitlement(
targetCapacity, maxCapacity));
}
// Schedulers have different ways of naming queues. See YARN-2773
protected String getReservationQueueName(String planQueueName,
String reservationId) {
return reservationId;
}
/**
* First sets entitlement of queues to zero to prevent new app submission.
* Then move all apps in the set of queues to the parent plan queue's default
* reservation queue if move is enabled. Finally cleanups the queue by killing
* any apps (if move is disabled or move failed) and removing the queue
*/
protected void cleanupExpiredQueues(String planQueueName,
boolean shouldMove, Set toRemove, String defReservationQueue) {
for (String expiredReservationId : toRemove) {
try {
// reduce entitlement to 0
String expiredReservation = getReservationQueueName(planQueueName,
expiredReservationId);
setQueueEntitlement(planQueueName, expiredReservation, 0.0f, 0.0f);
if (shouldMove) {
moveAppsInQueueSync(expiredReservation, defReservationQueue);
}
if (scheduler.getAppsInQueue(expiredReservation).size() > 0) {
scheduler.killAllAppsInQueue(expiredReservation);
LOG.info("Killing applications in queue: {}", expiredReservation);
} else {
scheduler.removeQueue(expiredReservation);
LOG.info("Queue: " + expiredReservation + " removed");
}
} catch (YarnException e) {
LOG.warn("Exception while trying to expire reservation: {}",
expiredReservationId, e);
}
}
}
/**
* Move all apps in the set of queues to the parent plan queue's default
* reservation queue in a synchronous fashion
*/
private void moveAppsInQueueSync(String expiredReservation,
String defReservationQueue) {
List activeApps =
scheduler.getAppsInQueue(expiredReservation);
if (activeApps.isEmpty()) {
return;
}
for (ApplicationAttemptId app : activeApps) {
// fallback to parent's default queue
try {
scheduler.moveApplication(app.getApplicationId(), defReservationQueue);
} catch (YarnException e) {
LOG.warn(
"Encountered unexpected error during migration of application: {}" +
" from reservation: {}",
app, expiredReservation, e);
}
}
}
protected int getReservedResources(long now, Set
currentReservations, Set curReservationNames,
Resource reservedResources) {
int numRes = 0;
if (currentReservations != null) {
numRes = currentReservations.size();
for (ReservationAllocation reservation : currentReservations) {
curReservationNames.add(reservation.getReservationId().toString());
Resources.addTo(reservedResources, reservation.getResourcesAtTime(now));
}
}
return numRes;
}
/**
* Sort in the order from the least new amount of resources asked (likely
* negative) to the highest. This prevents "order-of-operation" errors related
* to exceeding 100% capacity temporarily.
*/
protected List sortByDelta(
List currentReservations, long now, Plan plan) {
Collections.sort(currentReservations, new ReservationAllocationComparator(
now, this, plan));
return currentReservations;
}
/**
* Get queue associated with reservable queue named
* @param planQueueName Name of the reservable queue
* @return queue associated with the reservable queue
*/
protected abstract Queue getPlanQueue(String planQueueName);
/**
* Calculates ratio of reservationResources to planResources
*/
protected abstract float calculateReservationToPlanRatio(
Resource clusterResources, Resource planResources,
Resource reservationResources);
/**
* Check if plan resources are less than expected reservation resources
*/
protected abstract boolean arePlanResourcesLessThanReservations(
Resource clusterResources, Resource planResources,
Resource reservedResources);
/**
* Get a list of reservation queues for this planQueue
*/
protected abstract List getChildReservationQueues(
Queue planQueue);
/**
* Add a new reservation queue for reservation currResId for this planQueue
*/
protected abstract void addReservationQueue(
String planQueueName, Queue queue, String currResId);
/**
* Creates the default reservation queue for use when no reservation is
* used for applications submitted to this planQueue
*/
protected abstract void createDefaultReservationQueue(
String planQueueName, Queue queue, String defReservationQueue);
/**
* Get plan resources for this planQueue
*/
protected abstract Resource getPlanResources(
Plan plan, Queue queue, Resource clusterResources);
/**
* Get reservation queue resources if it exists otherwise return null
*/
protected abstract Resource getReservationQueueResourceIfExists(Plan plan,
ReservationId reservationId);
private static class ReservationAllocationComparator implements
Comparator {
AbstractSchedulerPlanFollower planFollower;
long now;
Plan plan;
ReservationAllocationComparator(long now,
AbstractSchedulerPlanFollower planFollower, Plan plan) {
this.now = now;
this.planFollower = planFollower;
this.plan = plan;
}
private Resource getUnallocatedReservedResources(
ReservationAllocation reservation) {
Resource resResource;
Resource reservationResource = planFollower
.getReservationQueueResourceIfExists
(plan, reservation.getReservationId());
if (reservationResource != null) {
resResource =
Resources.subtract(
reservation.getResourcesAtTime(now),
reservationResource);
} else {
resResource = reservation.getResourcesAtTime(now);
}
return resResource;
}
@Override
public int compare(ReservationAllocation lhs, ReservationAllocation rhs) {
// compute delta between current and previous reservation, and compare
// based on that
Resource lhsRes = getUnallocatedReservedResources(lhs);
Resource rhsRes = getUnallocatedReservedResources(rhs);
return lhsRes.compareTo(rhsRes);
}
}
}