GJL commented on a change in pull request #8486: [FLINK-12372] [runtime] 
implement ExecutionSlotAllocator
URL: https://github.com/apache/flink/pull/8486#discussion_r290328242
 
 

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 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/ExecutionVertexSchedulingRequirements.java
 ##########
 @@ -0,0 +1,88 @@
+/*
+ * 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.clusterframework.types.AllocationID;
+import org.apache.flink.runtime.clusterframework.types.ResourceProfile;
+import org.apache.flink.runtime.executiongraph.ExecutionVertex;
+import org.apache.flink.runtime.instance.SlotSharingGroupId;
+import org.apache.flink.runtime.jobmanager.scheduler.CoLocationConstraint;
+import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID;
+import org.apache.flink.runtime.taskmanager.TaskManagerLocation;
+
+import java.util.Collection;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * The requirements for scheduling a {@link ExecutionVertex}.
+ */
+public class ExecutionVertexSchedulingRequirements {
+
+       private final ExecutionVertexID executionVertexId;
+
+       private final AllocationID previousAllocationId;
+
+       private final ResourceProfile resourceProfile;
+
+       private final SlotSharingGroupId slotSharingGroupId;
+
+       private final CoLocationConstraint coLocationConstraint;
+
+       private final Collection<TaskManagerLocation> preferredLocations;
+
+       public ExecutionVertexSchedulingRequirements(
 
 Review comment:
   A constructor this big would benefit from the builder pattern, e.g.,
   ```
        /**
         * Builder for {@link ExecutionVertexSchedulingRequirements}.
         */
        public static class Builder {
   
                private ExecutionVertexID executionVertexId;
   
                private AllocationID previousAllocationId;
   
                private ResourceProfile resourceProfile = 
ResourceProfile.UNKNOWN;
   
                private SlotSharingGroupId slotSharingGroupId;
   
                private CoLocationConstraint coLocationConstraint;
   
                private Collection<TaskManagerLocation> preferredLocations = 
Collections.emptyList();
   
                public Builder withExecutionVertexId(final ExecutionVertexID 
executionVertexId) {
                        this.executionVertexId = executionVertexId;
                        return this;
                }
   
                public Builder withPreviousAllocationId(final AllocationID 
previousAllocationId) {
                        this.previousAllocationId = previousAllocationId;
                        return this;
                }
   
                public Builder withResourceProfile(final ResourceProfile 
resourceProfile) {
                        this.resourceProfile = resourceProfile;
                        return this;
                }
   
                public Builder withSlotSharingGroupId(final SlotSharingGroupId 
slotSharingGroupId) {
                        this.slotSharingGroupId = slotSharingGroupId;
                        return this;
                }
   
                public Builder withCoLocationConstraint(final 
CoLocationConstraint coLocationConstraint) {
                        this.coLocationConstraint = coLocationConstraint;
                        return this;
                }
   
                public Builder withPreferredLocations(final 
Collection<TaskManagerLocation> preferredLocations) {
                        this.preferredLocations = preferredLocations;
                        return this;
                }
   
                public ExecutionVertexSchedulingRequirements build() {
                        return new ExecutionVertexSchedulingRequirements(
                                executionVertexId,
                                previousAllocationId,
                                resourceProfile,
                                slotSharingGroupId,
                                coLocationConstraint,
                                preferredLocations);
                }
        }
   ```

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