johnyangk commented on a change in pull request #115: [NEMO-96] Modularize 
DataSkewPolicy to use MetricVertex and BarrierVertex
URL: https://github.com/apache/incubator-nemo/pull/115#discussion_r214380969
 
 

 ##########
 File path: 
common/src/main/java/edu/snu/nemo/common/ir/vertex/transform/MetricCollectTransform.java
 ##########
 @@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2018 Seoul National University
+ *
+ * Licensed 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 edu.snu.nemo.common.ir.vertex.transform;
+
+import edu.snu.nemo.common.KeyExtractor;
+import edu.snu.nemo.common.Pair;
+import edu.snu.nemo.common.ir.OutputCollector;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A {@link Transform} relays input data from upstream vertex to downstream 
vertex promptly.
 
 Review comment:
   Ditto.

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