shuai-xu commented on a change in pull request #8486: [FLINK-12372] [runtime] implement ExecutionSlotAllocator URL: https://github.com/apache/flink/pull/8486#discussion_r291936941
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/DefaultExecutionSlotAllocator.java ########## @@ -0,0 +1,250 @@ +/* + * 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.annotation.VisibleForTesting; +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.executiongraph.ExecutionVertex; +import org.apache.flink.runtime.instance.SlotSharingGroupId; +import org.apache.flink.runtime.jobmanager.scheduler.ScheduledUnit; +import org.apache.flink.runtime.jobmaster.LogicalSlot; +import org.apache.flink.runtime.jobmaster.SlotRequestId; +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.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; +import java.util.Arrays; +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Optional; +import java.util.Set; +import java.util.concurrent.CompletableFuture; + +import static org.apache.flink.runtime.executiongraph.ExecutionVertex.MAX_DISTINCT_LOCATIONS_TO_CONSIDER; + +import static org.apache.flink.util.Preconditions.checkNotNull; + +/** + * Default {@link ExecutionSlotAllocator} which will use {@link SlotProvider} to allocate slots and + * keep the unfulfilled requests for further cancellation. + */ +public class DefaultExecutionSlotAllocator implements ExecutionSlotAllocator { + + private static final Logger LOG = LoggerFactory.getLogger(DefaultExecutionSlotAllocator.class); + + /** + * Store the uncompleted slot assignments. + */ + private final Map<ExecutionVertexID, SlotExecutionVertexAssignment> pendingSlotAssignments; + + private final SlotProvider slotProvider; + + private final InputsLocationsRetriever inputsLocationsRetriever; + + private final Time allocationTimeout; + + public DefaultExecutionSlotAllocator( + SlotProvider slotProvider, + InputsLocationsRetriever inputsLocationsRetriever, + Time allocationTimeout) { + this.slotProvider = checkNotNull(slotProvider); + this.inputsLocationsRetriever = checkNotNull(inputsLocationsRetriever); + this.allocationTimeout = checkNotNull(allocationTimeout); + + pendingSlotAssignments = new HashMap<>(); + } + + @Override + public Collection<SlotExecutionVertexAssignment> allocateSlotsFor( + Collection<ExecutionVertexSchedulingRequirements> executionVertexSchedulingRequirements) { + + List<SlotExecutionVertexAssignment> slotExecutionVertexAssignments = + new ArrayList<>(executionVertexSchedulingRequirements.size()); + + Set<AllocationID> allPreviousAllocationIds = computeAllPriorAllocationIds(executionVertexSchedulingRequirements); + + for (ExecutionVertexSchedulingRequirements schedulingRequirements : executionVertexSchedulingRequirements) { + final ExecutionVertexID executionVertexId = schedulingRequirements.getExecutionVertexId(); + final SlotRequestId slotRequestId = new SlotRequestId(); + final SlotSharingGroupId slotSharingGroupId = schedulingRequirements.getSlotSharingGroupId(); + + LOG.debug("Allocate slot with id {} for execution {}", slotRequestId, executionVertexId); + + CompletableFuture<LogicalSlot> slotFuture = calculatePreferredLocations( + executionVertexId, + schedulingRequirements.getPreferredLocations(), + inputsLocationsRetriever).thenCompose( + (Collection<TaskManagerLocation> preferredLocations) -> + slotProvider.allocateSlot( + slotRequestId, + new ScheduledUnit( + null, + executionVertexId.getJobVertexId(), + slotSharingGroupId, + schedulingRequirements.getCoLocationConstraint()), + new SlotProfile( + schedulingRequirements.getResourceProfile(), + preferredLocations, + Arrays.asList(schedulingRequirements.getPreviousAllocationId()), + allPreviousAllocationIds), + true, + allocationTimeout)); + + SlotExecutionVertexAssignment slotExecutionVertexAssignment = + new SlotExecutionVertexAssignment(executionVertexId, slotFuture); + // add to map first to avoid the future completed before added. + pendingSlotAssignments.put(executionVertexId, slotExecutionVertexAssignment); + + slotFuture.whenComplete( + (ignored, throwable) -> { + pendingSlotAssignments.remove(executionVertexId); + if (throwable != null) { + slotProvider.cancelSlotRequest(slotRequestId, slotSharingGroupId, throwable); + } + }); + + slotExecutionVertexAssignments.add(slotExecutionVertexAssignment); + } + + return slotExecutionVertexAssignments; + } + + @Override + public void cancel(ExecutionVertexID executionVertexId) { + SlotExecutionVertexAssignment slotExecutionVertexAssignment = pendingSlotAssignments.get(executionVertexId); + if (slotExecutionVertexAssignment != null) { + slotExecutionVertexAssignment.getLogicalSlotFuture().cancel(false); + } + } + + @Override + public CompletableFuture<Void> stop() { + List<ExecutionVertexID> executionVertexIds = new ArrayList<>(pendingSlotAssignments.keySet()); + executionVertexIds.stream().forEach(executionVertexID -> cancel(executionVertexID)); + + return CompletableFuture.completedFuture(null); + } + + /** + * Calculates the preferred locations for an execution. + * It will first try to use preferred locations based on state, + * if null, will use the preferred locations based on inputs. + */ + private static CompletableFuture<Collection<TaskManagerLocation>> calculatePreferredLocations( + ExecutionVertexID executionVertexId, + Collection<TaskManagerLocation> preferredLocationsBasedOnState, + InputsLocationsRetriever inputsLocationsRetriever) { + + if (preferredLocationsBasedOnState != null && !preferredLocationsBasedOnState.isEmpty()) { Review comment: Done ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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