sanha 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_r214889652
 
 

 ##########
 File path: 
compiler/optimizer/src/main/java/edu/snu/nemo/compiler/optimizer/pass/compiletime/reshaping/SkewReshapingPass.java
 ##########
 @@ -49,33 +56,40 @@ public SkewReshapingPass() {
   @Override
   public DAG<IRVertex, IREdge> apply(final DAG<IRVertex, IREdge> dag) {
     final DAGBuilder<IRVertex, IREdge> builder = new DAGBuilder<>();
-    final List<MetricCollectionBarrierVertex> metricCollectionVertices = new 
ArrayList<>();
+    final List<MetricCollectionVertex> metricCollectionVertices = new 
ArrayList<>();
 
     dag.topologicalDo(v -> {
       // We care about OperatorVertices that have any incoming edges that are 
of type Shuffle.
       if (v instanceof OperatorVertex && 
dag.getIncomingEdgesOf(v).stream().anyMatch(irEdge ->
           CommunicationPatternProperty.Value.Shuffle
-          
.equals(irEdge.getPropertyValue(CommunicationPatternProperty.class).get()))) {
-        final MetricCollectionBarrierVertex<Integer, Long> 
metricCollectionBarrierVertex
-            = new MetricCollectionBarrierVertex<>();
-        metricCollectionVertices.add(metricCollectionBarrierVertex);
-        builder.addVertex(v);
-        builder.addVertex(metricCollectionBarrierVertex);
+          
.equals(irEdge.getPropertyValue(CommunicationPatternProperty.class).get()))
+        && dag.getIncomingEdgesOf(v).stream().noneMatch(irEdge ->
+      irEdge.getPropertyValue(AdditionalOutputTagProperty.class).isPresent())) 
{
 
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