zhuzhurk commented on a change in pull request #13009: URL: https://github.com/apache/flink/pull/13009#discussion_r464556118
########## File path: flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/LocalInputPreferredSlotSharingStrategy.java ########## @@ -0,0 +1,297 @@ +/* + * 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.runtime.instance.SlotSharingGroupId; +import org.apache.flink.runtime.jobgraph.JobVertexID; +import org.apache.flink.runtime.jobmanager.scheduler.CoLocationConstraintDesc; +import org.apache.flink.runtime.jobmanager.scheduler.CoLocationGroupDesc; +import org.apache.flink.runtime.jobmanager.scheduler.SlotSharingGroup; +import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID; +import org.apache.flink.runtime.scheduler.strategy.SchedulingExecutionVertex; +import org.apache.flink.runtime.scheduler.strategy.SchedulingResultPartition; +import org.apache.flink.runtime.scheduler.strategy.SchedulingTopology; + +import java.util.ArrayList; +import java.util.HashMap; +import java.util.HashSet; +import java.util.IdentityHashMap; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.Set; + +import static org.apache.flink.util.Preconditions.checkNotNull; +import static org.apache.flink.util.Preconditions.checkState; + +/** + * This strategy tries to reduce remote data exchanges. Execution vertices, which are connected + * and belong to the same SlotSharingGroup, tend to be put in the same ExecutionSlotSharingGroup. + * Co-location constraints will be respected. + */ +class LocalInputPreferredSlotSharingStrategy implements SlotSharingStrategy { + + private final Map<ExecutionVertexID, ExecutionSlotSharingGroup> executionSlotSharingGroupMap; + + LocalInputPreferredSlotSharingStrategy( + final SchedulingTopology topology, + final Set<SlotSharingGroup> logicalSlotSharingGroups, + final Set<CoLocationGroupDesc> coLocationGroups) { + + this.executionSlotSharingGroupMap = new ExecutionSlotSharingGroupBuilder( + topology, + logicalSlotSharingGroups, + coLocationGroups).build(); + } + + @Override + public ExecutionSlotSharingGroup getExecutionSlotSharingGroup(final ExecutionVertexID executionVertexId) { + return executionSlotSharingGroupMap.get(executionVertexId); + } + + @Override + public Set<ExecutionSlotSharingGroup> getExecutionSlotSharingGroups() { + return new HashSet<>(executionSlotSharingGroupMap.values()); + } + + static class Factory implements SlotSharingStrategy.Factory { + + public LocalInputPreferredSlotSharingStrategy create( + final SchedulingTopology topology, + final Set<SlotSharingGroup> logicalSlotSharingGroups, + final Set<CoLocationGroupDesc> coLocationGroups) { + + return new LocalInputPreferredSlotSharingStrategy(topology, logicalSlotSharingGroups, coLocationGroups); + } + } + + private static class ExecutionSlotSharingGroupBuilder { + private final SchedulingTopology topology; + + private final Map<JobVertexID, SlotSharingGroupId> slotSharingGroupMap; + + private final Map<JobVertexID, CoLocationGroupDesc> coLocationGroupMap; + + private final Map<ExecutionVertexID, ExecutionSlotSharingGroup> executionSlotSharingGroupMap; + + final Map<CoLocationConstraintDesc, ExecutionSlotSharingGroup> constraintToExecutionSlotSharingGroupMap; + + final Map<SlotSharingGroupId, List<ExecutionSlotSharingGroup>> executionSlotSharingGroups; + + private final Map<ExecutionSlotSharingGroup, Set<JobVertexID>> assignedJobVerticesForGroups; + + private ExecutionSlotSharingGroupBuilder( + final SchedulingTopology topology, + final Set<SlotSharingGroup> logicalSlotSharingGroups, + final Set<CoLocationGroupDesc> coLocationGroups) { + + this.topology = checkNotNull(topology); + + this.slotSharingGroupMap = new HashMap<>(); + for (SlotSharingGroup slotSharingGroup : logicalSlotSharingGroups) { + for (JobVertexID jobVertexId : slotSharingGroup.getJobVertexIds()) { + slotSharingGroupMap.put(jobVertexId, slotSharingGroup.getSlotSharingGroupId()); + } + } + + this.coLocationGroupMap = new HashMap<>(); + for (CoLocationGroupDesc coLocationGroup : coLocationGroups) { + for (JobVertexID jobVertexId : coLocationGroup.getVertices()) { + coLocationGroupMap.put(jobVertexId, coLocationGroup); + } + } + + executionSlotSharingGroupMap = new HashMap<>(); + constraintToExecutionSlotSharingGroupMap = new HashMap<>(); + executionSlotSharingGroups = new HashMap<>(); + assignedJobVerticesForGroups = new IdentityHashMap<>(); + } + + /** + * Build ExecutionSlotSharingGroups for all vertices in the topology. + * The ExecutionSlotSharingGroup of a vertex is determined in order below: + * + * <p>1. try finding an existing group of the corresponding co-location constraint. + * + * <p>2. try finding an available group of its producer vertex if the producer is in the same slot sharing group. + * + * <p>3. try finding any available group. + * + * <p>4. create a new group. + */ + private Map<ExecutionVertexID, ExecutionSlotSharingGroup> build() { + final LinkedHashMap<JobVertexID, List<SchedulingExecutionVertex>> allVertices = getExecutionVertices(); + + // loop on job vertices so that an execution vertex will not be add into a group + // if that group better fits another execution vertex + for (List<SchedulingExecutionVertex> executionVertices : allVertices.values()) { + final List<SchedulingExecutionVertex> remaining = tryFindOptimalAvailableExecutionSlotSharingGroupFor( + executionVertices); + + findAvailableOrCreateNewExecutionSlotSharingGroupFor(remaining); + + updateConstraintToExecutionSlotSharingGroupMap(executionVertices); + } + + return executionSlotSharingGroupMap; + } + + private LinkedHashMap<JobVertexID, List<SchedulingExecutionVertex>> getExecutionVertices() { + final LinkedHashMap<JobVertexID, List<SchedulingExecutionVertex>> vertices = new LinkedHashMap<>(); + for (SchedulingExecutionVertex executionVertex : topology.getVertices()) { + final List<SchedulingExecutionVertex> executionVertexGroup = vertices.computeIfAbsent( + executionVertex.getId().getJobVertexId(), + k -> new ArrayList<>()); + executionVertexGroup.add(executionVertex); + } + return vertices; + } + + private List<SchedulingExecutionVertex> tryFindOptimalAvailableExecutionSlotSharingGroupFor( + final List<SchedulingExecutionVertex> executionVertices) { + + final List<SchedulingExecutionVertex> remaining = new ArrayList<>(); + for (SchedulingExecutionVertex executionVertex : executionVertices) { + ExecutionSlotSharingGroup group = tryFindAvailableCoLocatedExecutionSlotSharingGroupFor(executionVertex); + + if (group == null) { + group = tryFindAvailableProducerExecutionSlotSharingGroupFor(executionVertex); + } + + if (group == null) { + remaining.add(executionVertex); + } else { + addVertexToExecutionSlotSharingGroup(executionVertex, group); + } + } + + return remaining; + } + + private ExecutionSlotSharingGroup tryFindAvailableCoLocatedExecutionSlotSharingGroupFor( + final SchedulingExecutionVertex executionVertex) { + + final ExecutionVertexID executionVertexId = executionVertex.getId(); + final CoLocationGroupDesc coLocationGroup = coLocationGroupMap.get(executionVertexId.getJobVertexId()); + if (coLocationGroup != null) { + final CoLocationConstraintDesc constraint = coLocationGroup.getLocationConstraint( + executionVertexId.getSubtaskIndex()); + + return constraintToExecutionSlotSharingGroupMap.get(constraint); + } else { + return null; + } + } + + private ExecutionSlotSharingGroup tryFindAvailableProducerExecutionSlotSharingGroupFor( + final SchedulingExecutionVertex executionVertex) { + + final ExecutionVertexID executionVertexId = executionVertex.getId(); + + for (SchedulingResultPartition partition : executionVertex.getConsumedResults()) { + final ExecutionVertexID producerVertexId = partition.getProducer().getId(); + if (!inSameLogicalSlotSharingGroup(producerVertexId, executionVertexId)) { + continue; + } + + final ExecutionSlotSharingGroup producerGroup = executionSlotSharingGroupMap.get(producerVertexId); + + checkState(producerGroup != null); + if (isGroupAvailableForVertex(producerGroup, executionVertexId)) { + return producerGroup; + } + } + + return null; + } + + private boolean inSameLogicalSlotSharingGroup( + final ExecutionVertexID executionVertexId1, + final ExecutionVertexID executionVertexId2) { + + final SlotSharingGroupId slotSharingGroupId1 = slotSharingGroupMap.get(executionVertexId1.getJobVertexId()); + final SlotSharingGroupId slotSharingGroupId2 = slotSharingGroupMap.get(executionVertexId2.getJobVertexId()); + + return slotSharingGroupId1 != null && slotSharingGroupId1.equals(slotSharingGroupId2); + } + + private boolean isGroupAvailableForVertex( + final ExecutionSlotSharingGroup executionSlotSharingGroup, + final ExecutionVertexID executionVertexId) { + + final Set<JobVertexID> assignedVertices = assignedJobVerticesForGroups.get(executionSlotSharingGroup); + return assignedVertices == null || !assignedVertices.contains(executionVertexId.getJobVertexId()); + } + + private void addVertexToExecutionSlotSharingGroup( + final SchedulingExecutionVertex vertex, + final ExecutionSlotSharingGroup group) { + + group.addVertex(vertex.getId()); + executionSlotSharingGroupMap.put(vertex.getId(), group); + assignedJobVerticesForGroups.computeIfAbsent(group, k -> new HashSet<>()).add(vertex.getId().getJobVertexId()); + } + + private void findAvailableOrCreateNewExecutionSlotSharingGroupFor( + final List<SchedulingExecutionVertex> executionVertices) { + + for (SchedulingExecutionVertex executionVertex : executionVertices) { + // create a new slotSharingGroupId if the vertex is not in a slot sharing group Review comment: Done by introducing `getSlotSharingGroupId(...)` which checks the slot sharing group to be non-null. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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