[GitHub] [flink] shuai-xu commented on a change in pull request #8688: [FLINK-12760] [runtime] Implement ExecutionGraph to InputsLocationsRetriever Adapter

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shuai-xu commented on a change in pull request #8688: [FLINK-12760] [runtime] Implement ExecutionGraph to InputsLocationsRetriever Adapter
URL: https://github.com/apache/flink/pull/8688#discussion_r293643179
 
 

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 File path: flink-runtime/src/main/java/org/apache/flink/runtime/scheduler/EGBasedInputsLocationsRetriever.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;
+
+import org.apache.flink.runtime.execution.ExecutionState;
+import org.apache.flink.runtime.executiongraph.ExecutionEdge;
+import org.apache.flink.runtime.executiongraph.ExecutionGraph;
+import org.apache.flink.runtime.executiongraph.ExecutionJobVertex;
+import org.apache.flink.runtime.executiongraph.ExecutionVertex;
+import org.apache.flink.runtime.scheduler.strategy.ExecutionVertexID;
+import org.apache.flink.runtime.taskmanager.TaskManagerLocation;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+import java.util.concurrent.CompletableFuture;
+
+import static org.apache.flink.util.Preconditions.checkNotNull;
+
+/**
+ * An implementation of {@link InputsLocationsRetriever} based on the {@link ExecutionGraph}.
+ */
+public class EGBasedInputsLocationsRetriever implements InputsLocationsRetriever {
+
+	private final ExecutionGraph executionGraph;
+
+	public EGBasedInputsLocationsRetriever(ExecutionGraph executionGraph) {
+		this.executionGraph = checkNotNull(executionGraph);
+	}
+
+	@Override
+	public Collection<Collection<ExecutionVertexID>> getConsumedResultPartitionsProducers(
+			ExecutionVertexID executionVertexId) {
+		ExecutionVertex ev = getExecutionVertex(executionVertexId);
+
+		List<Collection<ExecutionVertexID>> resultPartitionProducers = new ArrayList<>(ev.getNumberOfInputs());
+		for (int i = 0 ; i < ev.getNumberOfInputs(); i++) {
+			ExecutionEdge[] inputEdges = ev.getInputEdges(i);
+			List<ExecutionVertexID> producers = new ArrayList<>(inputEdges.length);
+			for (ExecutionEdge inputEdge : inputEdges) {
+				ExecutionVertex producer = inputEdge.getSource().getProducer();
+				producers.add(new ExecutionVertexID(producer.getJobvertexId(), producer.getParallelSubtaskIndex()));
+			}
+			resultPartitionProducers.add(producers);
+
+		}
+		return resultPartitionProducers;
+	}
+
+	@Override
+	public Optional<CompletableFuture<TaskManagerLocation>> getTaskManagerLocation(ExecutionVertexID executionVertexId) {
+		ExecutionVertex ev = getExecutionVertex(executionVertexId);
+
+		if (ev.getExecutionState() != ExecutionState.CREATED) {
+			return Optional.of(ev.getCurrentTaskManagerLocationFuture());
+		} else {
+			return Optional.empty();
+		}
+	}
+
+	private ExecutionVertex getExecutionVertex(ExecutionVertexID executionVertexId) {
+
+		ExecutionJobVertex ejv = executionGraph.getJobVertex(executionVertexId.getJobVertexId());
+		if (ejv == null || ejv.getParallelism() <= executionVertexId.getSubtaskIndex()) {
+			throw new IllegalArgumentException(String.format("Failed to find execution {} in execution graph.", executionVertexId));
 
 Review comment:
   Done

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