Github user Ethanlm commented on a diff in the pull request:
https://github.com/apache/storm/pull/2270#discussion_r132343096
--- Diff:
storm-client/src/jvm/org/apache/storm/grouping/LocalityAwareShuffleGrouping.java
---
@@ -0,0 +1,80 @@
+/*
+ * 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.storm.grouping;
+
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.ConcurrentHashMap;
+import org.apache.storm.generated.GlobalStreamId;
+import org.apache.storm.task.WorkerTopologyContext;
+
+public class LocalityAwareShuffleGrouping implements CustomStreamGrouping,
Serializable {
+ private ConcurrentHashMap<Integer, ConcurrentHashMap<Integer, Double>>
taskNetworkDistance;
+ private List<Integer> targetTasks;
+ private Random rand;
+
+ @Override
+ public void prepare(WorkerTopologyContext context, GlobalStreamId
stream, List<Integer> targetTasks) {
+ rand = new Random();
+ taskNetworkDistance = context.getTaskNetworkDistance();
+ this.targetTasks = targetTasks;
+ }
+
+ /**
+ * Choose the target task with the minimum distance.
+ * If there are more than one task with the minimum distance, randomly
pick one.
+ * @param taskId The source taskId
+ * @param values the values to group on
+ * @return The chosen tasks
+ */
+ @Override
+ public List<Integer> chooseTasks(int taskId, List<Object> values) {
+ if (taskNetworkDistance == null || taskNetworkDistance.isEmpty()
|| !taskNetworkDistance.containsKey(taskId)) {
+ return new
ArrayList<>(targetTasks.get(rand.nextInt(targetTasks.size())));
+ }
+
+ ConcurrentHashMap<Integer, Double> taskIdToDistance =
taskNetworkDistance.get(taskId);
+
+ int sameDistanceAppearanceCount = 1;
+
+ double minDistance = Double.MAX_VALUE;
+ Integer closestTargetTask = targetTasks.get(0);
+ for(Integer targetTaskId: targetTasks) {
--- End diff --
Thanks. Will fix it
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