zhuzhurk commented on a change in pull request #12256: URL: https://github.com/apache/flink/pull/12256#discussion_r438860287
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/OneSlotPerExecutionSlotAllocator.java ########## @@ -0,0 +1,240 @@ +/* + * 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.scheduler; + +import org.apache.flink.api.common.time.Time; +import org.apache.flink.runtime.clusterframework.types.AllocationID; +import org.apache.flink.runtime.clusterframework.types.SlotProfile; +import org.apache.flink.runtime.concurrent.FutureUtils; +import org.apache.flink.runtime.jobmanager.scheduler.Locality; +import org.apache.flink.runtime.jobmaster.LogicalSlot; +import org.apache.flink.runtime.jobmaster.SlotOwner; +import org.apache.flink.runtime.jobmaster.SlotRequestId; +import org.apache.flink.runtime.jobmaster.slotpool.BulkSlotProvider; +import org.apache.flink.runtime.jobmaster.slotpool.PhysicalSlotRequest; +import org.apache.flink.runtime.jobmaster.slotpool.SingleLogicalSlot; +import org.apache.flink.runtime.jobmaster.slotpool.SlotProvider; +import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID; +import org.apache.flink.runtime.taskmanager.TaskManagerLocation; +import org.apache.flink.util.FlinkException; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; +import java.util.Collection; +import java.util.Collections; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.CompletableFuture; +import java.util.function.Function; +import java.util.stream.Collectors; + +import static org.apache.flink.util.Preconditions.checkNotNull; +import static org.apache.flink.util.Preconditions.checkState; + +/** + * This slot allocator will request one physical slot for each single execution vertex. + * The slots will be requested in bulks so that the {@link SlotProvider} can check + * whether this bulk of slot requests can be fulfilled at the same time. + * It has several limitations: + * + * <p>1. Slot sharing will be ignored. + * + * <p>2. Co-location constraints are not allowed. + * + * <p>3. Intra-bulk input location preferences will be ignored. + */ +class OneSlotPerExecutionSlotAllocator extends AbstractExecutionSlotAllocator { + + private static final Logger LOG = LoggerFactory.getLogger(OneSlotPerExecutionSlotAllocator.class); + + private final BulkSlotProvider slotProvider; + + private final SlotOwner slotOwner; + + private final boolean slotWillBeOccupiedIndefinitely; + + private final Time allocationTimeout; + + OneSlotPerExecutionSlotAllocator( + final BulkSlotProvider slotProvider, + final PreferredLocationsRetriever preferredLocationsRetriever, + final boolean slotWillBeOccupiedIndefinitely, + final Time allocationTimeout) { + + super(preferredLocationsRetriever); + + this.slotProvider = checkNotNull(slotProvider); + this.slotWillBeOccupiedIndefinitely = slotWillBeOccupiedIndefinitely; + this.allocationTimeout = checkNotNull(allocationTimeout); + + this.slotOwner = new OneSlotPerExecutionSlotAllocatorSlotOwner(); + } + + @Override + public List<SlotExecutionVertexAssignment> allocateSlotsFor( + final List<ExecutionVertexSchedulingRequirements> executionVertexSchedulingRequirements) { + + validateSchedulingRequirements(executionVertexSchedulingRequirements); + + validateNoCoLocationConstraint(executionVertexSchedulingRequirements); + + final List<SlotExecutionVertexAssignment> slotExecutionVertexAssignments = + createSlotExecutionVertexAssignments(executionVertexSchedulingRequirements); + + final Map<ExecutionVertexID, SlotRequestId> executionVertexSlotRequestIds = slotExecutionVertexAssignments + .stream() + .collect( + Collectors.toMap( + SlotExecutionVertexAssignment::getExecutionVertexId, + SlotExecutionVertexAssignment::getSlotRequestId)); + + final List<CompletableFuture<PhysicalSlotRequest>> physicalSlotRequestFutures = + createPhysicalSlotRequestFutures( + executionVertexSchedulingRequirements, + executionVertexSlotRequestIds); + + allocateSlotsForAssignments( + physicalSlotRequestFutures, + slotExecutionVertexAssignments); + + return Collections.unmodifiableList(slotExecutionVertexAssignments); + } + + private static void validateNoCoLocationConstraint( + final Collection<ExecutionVertexSchedulingRequirements> schedulingRequirements) { + + final boolean hasCoLocationConstraint = schedulingRequirements.stream() + .anyMatch(r -> r.getCoLocationConstraint() != null); + checkState( + !hasCoLocationConstraint, + "Jobs with co-location constraints are not allowed to run with pipelined region scheduling strategy."); + } + + private List<SlotExecutionVertexAssignment> createSlotExecutionVertexAssignments( + final List<ExecutionVertexSchedulingRequirements> executionVertexSchedulingRequirements) { + + final List<SlotExecutionVertexAssignment> slotExecutionVertexAssignments = + new ArrayList<>(executionVertexSchedulingRequirements.size()); + for (ExecutionVertexSchedulingRequirements schedulingRequirements : executionVertexSchedulingRequirements) { + final ExecutionVertexID executionVertexId = schedulingRequirements.getExecutionVertexId(); + + final SlotExecutionVertexAssignment slotExecutionVertexAssignment = + createAndRegisterSlotExecutionVertexAssignment( + executionVertexId, + new CompletableFuture<>(), + (slotRequestId, throwable) -> slotProvider.cancelSlotRequest(slotRequestId, throwable)); + slotExecutionVertexAssignments.add(slotExecutionVertexAssignment); + } + + return slotExecutionVertexAssignments; + } + + private List<CompletableFuture<PhysicalSlotRequest>> createPhysicalSlotRequestFutures( + final List<ExecutionVertexSchedulingRequirements> executionVertexSchedulingRequirements, + final Map<ExecutionVertexID, SlotRequestId> executionVertexSlotRequestIds) { + + final Set<ExecutionVertexID> allExecutionVertexIds = executionVertexSchedulingRequirements.stream() + .map(ExecutionVertexSchedulingRequirements::getExecutionVertexId) + .collect(Collectors.toSet()); + + final Set<AllocationID> allPreviousAllocationIds = + computeAllPriorAllocationIds(executionVertexSchedulingRequirements); + + final List<CompletableFuture<PhysicalSlotRequest>> physicalSlotRequestFutures = + new ArrayList<>(executionVertexSchedulingRequirements.size()); + for (ExecutionVertexSchedulingRequirements schedulingRequirements : executionVertexSchedulingRequirements) { + final ExecutionVertexID executionVertexId = schedulingRequirements.getExecutionVertexId(); + final SlotRequestId slotRequestId = executionVertexSlotRequestIds.get(executionVertexId); + + LOG.debug("Allocate slot with id {} for execution {}", slotRequestId, executionVertexId); + + final CompletableFuture<Collection<TaskManagerLocation>> preferredLocationsFuture = + calculatePreferredLocations(executionVertexId, allExecutionVertexIds); + + // use the task resource profile as the physical slot resource requirement since slot sharing is ignored + final CompletableFuture<SlotProfile> slotProfileFuture = preferredLocationsFuture.thenApply( + preferredLocations -> + SlotProfile.priorAllocation( + schedulingRequirements.getTaskResourceProfile(), + schedulingRequirements.getTaskResourceProfile(), + preferredLocations, + Collections.singletonList(schedulingRequirements.getPreviousAllocationId()), + allPreviousAllocationIds)); + + final CompletableFuture<PhysicalSlotRequest> physicalSlotRequestFuture = + slotProfileFuture.thenApply( + slotProfile -> createPhysicalSlotRequest(slotRequestId, slotProfile)); + physicalSlotRequestFutures.add(physicalSlotRequestFuture); + } + + return physicalSlotRequestFutures; + } + + private PhysicalSlotRequest createPhysicalSlotRequest( + final SlotRequestId slotRequestId, + final SlotProfile slotProfile) { + return new PhysicalSlotRequest(slotRequestId, slotProfile, slotWillBeOccupiedIndefinitely); + } + + private void allocateSlotsForAssignments( + final List<CompletableFuture<PhysicalSlotRequest>> physicalSlotRequestFutures, + final List<SlotExecutionVertexAssignment> slotExecutionVertexAssignments) { + + final Map<SlotRequestId, SlotExecutionVertexAssignment> requestToAssignmentMapping = + slotExecutionVertexAssignments.stream() + .collect(Collectors.toMap(SlotExecutionVertexAssignment::getSlotRequestId, Function.identity())); + + FutureUtils.combineAll(physicalSlotRequestFutures) + .thenCompose(physicalSlotRequests -> slotProvider.allocatePhysicalSlots(physicalSlotRequests, allocationTimeout)) + .thenAccept(physicalSlotRequestResults -> { + for (PhysicalSlotRequest.Result result : physicalSlotRequestResults) { + final SlotRequestId slotRequestId = result.getSlotRequestId(); + final SlotExecutionVertexAssignment assignment = requestToAssignmentMapping.get(slotRequestId); + + checkState(assignment != null); + + final LogicalSlot logicalSlot = SingleLogicalSlot.allocateFromPhysicalSlot( + slotRequestId, + result.getPhysicalSlot(), + Locality.UNKNOWN, + slotOwner, + slotWillBeOccupiedIndefinitely); + assignment.getLogicalSlotFuture().complete(logicalSlot); + } + }) + .exceptionally(ex -> { + slotExecutionVertexAssignments.forEach( + assignment -> assignment.getLogicalSlotFuture().completeExceptionally(ex)); + return null; + }); + } + + private class OneSlotPerExecutionSlotAllocatorSlotOwner implements SlotOwner { + + @Override + public void returnLogicalSlot(LogicalSlot logicalSlot) { + slotProvider.cancelSlotRequest( + logicalSlot.getSlotRequestId(), + new FlinkException("Slot is being returned to OneSlotPerExecutionSlotAllocator.")); + } + } Review comment: I think you are right. done. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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