GJL commented on a change in pull request #8309: [FLINK-12229] [runtime] 
Implement LazyFromSourcesScheduling Strategy
URL: https://github.com/apache/flink/pull/8309#discussion_r280769682
 
 

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 File path: 
flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/strategy/LazyFromSourcesSchedulingStrategy.java
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+/*
+ * 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.strategy;
+
+import org.apache.flink.api.common.InputDependencyConstraint;
+import org.apache.flink.runtime.execution.ExecutionState;
+import org.apache.flink.runtime.io.network.partition.ResultPartitionID;
+import org.apache.flink.runtime.jobgraph.IntermediateDataSet;
+import org.apache.flink.runtime.jobgraph.IntermediateDataSetID;
+import org.apache.flink.runtime.jobgraph.JobGraph;
+import org.apache.flink.runtime.scheduler.DeploymentOption;
+import org.apache.flink.runtime.scheduler.ExecutionVertexDeploymentOption;
+import org.apache.flink.runtime.scheduler.SchedulerOperations;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+import java.util.Set;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * {@link SchedulingStrategy} instance for batch job which schedule vertices 
when input data are ready.
+ */
+public class LazyFromSourcesSchedulingStrategy implements SchedulingStrategy {
+
+       private final SchedulerOperations schedulerOperations;
+
+       private final SchedulingTopology schedulingTopology;
+
+       private final DeploymentOption deploymentOption = new 
DeploymentOption(true);
+
+       private final JobGraph jobGraph;
+
+       private final Map<IntermediateDataSetID, SchedulingIntermediateDataSet> 
intermediateDataSets;
+
+       public LazyFromSourcesSchedulingStrategy(
+               SchedulerOperations schedulerOperations,
+               SchedulingTopology schedulingTopology,
+               JobGraph jobGraph) {
+               this.schedulerOperations = checkNotNull(schedulerOperations);
+               this.schedulingTopology = checkNotNull(schedulingTopology);
+               this.jobGraph = checkNotNull(jobGraph);
+               this.intermediateDataSets = new HashMap<>();
+       }
+
+       @Override
+       public void startScheduling() {
+               List<ExecutionVertexDeploymentOption> 
executionVertexDeploymentOptions = new LinkedList<>();
+               for (SchedulingVertex schedulingVertex : 
schedulingTopology.getVertices()) {
+                       if 
(jobGraph.findVertexByID(schedulingVertex.getJobVertexId()).isInputVertex()) {
+                               // schedule vertices without consumed result 
partition
+                               executionVertexDeploymentOptions.add(
+                                       new 
ExecutionVertexDeploymentOption(schedulingVertex.getId(), deploymentOption));
+                       }
+
+                       Collection<SchedulingResultPartition> partitions = 
schedulingVertex.getProducedResultPartitions();
+                       if (partitions != null) {
 
 Review comment:
   Returning `null` should be avoided. All `SchedulingVertex` implementations 
should be required to return an empty collection instead. The null check can be 
removed then.

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