zentol commented on a change in pull request #13464: URL: https://github.com/apache/flink/pull/13464#discussion_r494200862
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/resourcemanager/slotmanager/JobScopedResourceTracker.java ########## @@ -0,0 +1,224 @@ +/* + * 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.flink.runtime.resourcemanager.slotmanager; + +import org.apache.flink.api.common.JobID; +import org.apache.flink.runtime.clusterframework.types.ResourceProfile; +import org.apache.flink.runtime.slots.ResourceCounter; +import org.apache.flink.runtime.slots.ResourceRequirement; +import org.apache.flink.util.Preconditions; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.Set; + +/** + * Tracks resource for a single job. + */ +class JobScopedResourceTracker { + + private static final Logger LOG = LoggerFactory.getLogger(JobScopedResourceTracker.class); + + // only for logging purposes + private final JobID jobId; + + private final ResourceCounter resourceRequirements = new ResourceCounter(); + private final BiDirectionalResourceToRequirementMapping resourceToRequirementMapping = new BiDirectionalResourceToRequirementMapping(); + private final ResourceCounter excessResources = new ResourceCounter(); + + JobScopedResourceTracker(JobID jobId) { + this.jobId = Preconditions.checkNotNull(jobId); + } + + public void notifyResourceRequirements(Collection<ResourceRequirement> newResourceRequirements) { + Preconditions.checkNotNull(newResourceRequirements); + + resourceRequirements.clear(); + for (ResourceRequirement newResourceRequirement : newResourceRequirements) { + resourceRequirements.incrementCount(newResourceRequirement.getResourceProfile(), newResourceRequirement.getNumberOfRequiredSlots()); + } + findExcessSlots(); + tryAssigningExcessSlots(); + } + + public void notifyAcquiredResource(ResourceProfile resourceProfile) { + Preconditions.checkNotNull(resourceProfile); + final Optional<ResourceProfile> matchingRequirement = findMatchingRequirement(resourceProfile); + if (matchingRequirement.isPresent()) { + resourceToRequirementMapping.incrementCount(matchingRequirement.get(), resourceProfile, 1); + } else { + LOG.debug("Job {} acquired excess resource {}.", resourceProfile, jobId); + excessResources.incrementCount(resourceProfile, 1); + } + } + + private Optional<ResourceProfile> findMatchingRequirement(ResourceProfile resourceProfile) { + for (Map.Entry<ResourceProfile, Integer> requirementCandidate : resourceRequirements.getResourceProfilesWithCount()) { + ResourceProfile requirementProfile = requirementCandidate.getKey(); + + // beware the order when matching resources to requirements, because ResourceProfile.UNKNOWN (which only + // occurs as a requirement) does not match any resource! + if (resourceProfile.isMatching(requirementProfile) && requirementCandidate.getValue() > resourceToRequirementMapping.getNumFulfillingResources(requirementProfile)) { + return Optional.of(requirementProfile); + } + } + return Optional.empty(); + } + + public void notifyLostResource(ResourceProfile resourceProfile) { + Preconditions.checkNotNull(resourceProfile); + if (excessResources.getResourceCount(resourceProfile) > 0) { + LOG.trace("Job {} lost excess resource {}.", jobId, resourceProfile); + excessResources.decrementCount(resourceProfile, 1); + return; + } + + Set<ResourceProfile> fulfilledRequirements = resourceToRequirementMapping.getFulfilledRequirementsBy(resourceProfile).getResourceProfiles(); + + if (!fulfilledRequirements.isEmpty()) { + // determine for which of the requirements, that the resource could be used for, the resource count should be reduced for + ResourceProfile assignedRequirement = null; + + for (ResourceProfile requirementProfile : fulfilledRequirements) { + assignedRequirement = requirementProfile; + + // try finding a requirement that has too many resources, otherwise use any + if (resourceRequirements.getResourceCount(requirementProfile) < resourceToRequirementMapping.getNumFulfillingResources(requirementProfile)) { + break; + } + } + + if (assignedRequirement == null) { + // safeguard against programming errors + throw new IllegalStateException(String.format("Job %s lost a (non-excess) resource %s but no requirement was assigned to it.", jobId, resourceProfile)); + } + + resourceToRequirementMapping.decrementCount(assignedRequirement, resourceProfile, 1); + + tryAssigningExcessSlots(); + } else { + LOG.warn("Job {} lost a resource {} but no such resource was tracked.", jobId, resourceProfile); + } + } + + public Collection<ResourceRequirement> getRequiredResources() { + final Collection<ResourceRequirement> requiredResources = new ArrayList<>(); + for (Map.Entry<ResourceProfile, Integer> requirement : resourceRequirements.getResourceProfilesWithCount()) { + ResourceProfile requirementProfile = requirement.getKey(); + + int numRequiredResources = requirement.getValue(); + int numAcquiredResources = resourceToRequirementMapping.getNumFulfillingResources(requirementProfile); + + if (numAcquiredResources < numRequiredResources) { + requiredResources.add(ResourceRequirement.create(requirementProfile, numRequiredResources - numAcquiredResources)); + } + + } + return requiredResources; + } + + public Collection<ResourceRequirement> getAcquiredResources() { + final Set<ResourceProfile> knownResourceProfiles = new HashSet<>(); + knownResourceProfiles.addAll(resourceToRequirementMapping.getAllResourceProfiles()); + knownResourceProfiles.addAll(excessResources.getResourceProfiles()); + + final List<ResourceRequirement> acquiredResources = new ArrayList<>(); + for (ResourceProfile knownResourceProfile : knownResourceProfiles) { + int numTotalAcquiredResources = resourceToRequirementMapping.getNumFulfilledRequirements(knownResourceProfile) + excessResources.getResourceCount(knownResourceProfile); + ResourceRequirement resourceRequirement = ResourceRequirement.create(knownResourceProfile, numTotalAcquiredResources); + acquiredResources.add(resourceRequirement); + } + + return acquiredResources; + } + + public boolean isEmpty() { + return resourceRequirements.isEmpty() && excessResources.isEmpty(); + } + + private void findExcessSlots() { + final Collection<ExcessResource> excessResources = new ArrayList<>(); + + for (ResourceProfile requirementProfile : resourceToRequirementMapping.getAllRequirementProfiles()) { + int numTotalRequiredResources = resourceRequirements.getResourceCount(requirementProfile); + int numTotalAcquiredResources = resourceToRequirementMapping.getNumFulfillingResources(requirementProfile); + + if (numTotalAcquiredResources > numTotalRequiredResources) { + int numExcessResources = numTotalAcquiredResources - numTotalRequiredResources; + + for (Map.Entry<ResourceProfile, Integer> acquiredResource : resourceToRequirementMapping.getFulfillingResourcesFor(requirementProfile).getResourceProfilesWithCount()) { + ResourceProfile acquiredResourceProfile = acquiredResource.getKey(); + int numAcquiredResources = acquiredResource.getValue(); + + if (numAcquiredResources <= numExcessResources) { + excessResources.add(new ExcessResource(requirementProfile, acquiredResourceProfile, numAcquiredResources)); + + numExcessResources -= numAcquiredResources; + } else { + excessResources.add(new ExcessResource(requirementProfile, acquiredResourceProfile, numExcessResources)); + break; + } + } + } + } + + LOG.debug("Detected excess resources for job {}: {}", jobId, excessResources); + for (ExcessResource excessResource : excessResources) { + resourceToRequirementMapping.decrementCount(excessResource.requirementProfile, excessResource.resourceProfile, excessResource.numExcessResources); + this.excessResources.incrementCount(excessResource.resourceProfile, excessResource.numExcessResources); + } + } + + private void tryAssigningExcessSlots() { + if (LOG.isTraceEnabled()) { + LOG.trace("There are {} excess resources for job {} before re-assignment.", jobId, excessResources.getResourceCount()); + } + // this is a quick-and-dirty solution; in the worse case we copy the excessResources map twice Review comment: yes, this is only temporary ;) ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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