johnyangk commented on a change in pull request #232: [NEMO-411] Bug in 
ScheduleGroupPass, OutputTag, DuplicateEdgeGroup
URL: https://github.com/apache/incubator-nemo/pull/232#discussion_r327452671
 
 

 ##########
 File path: common/src/main/java/org/apache/nemo/common/ir/IRDAGChecker.java
 ##########
 @@ -471,9 +472,11 @@ private boolean isConnectedToStreamVertex(final IREdge 
irEdge) {
     return irEdge.getDst() instanceof RelayVertex || irEdge.getSrc() 
instanceof RelayVertex;
   }
 
-  private Map<Optional<String>, List<IREdge>> 
groupOutEdgesByAdditionalOutputTag(final List<IREdge> outEdges) {
+  private final AtomicInteger distinctIntegerForEmptyOutputTag = new 
AtomicInteger(0);
 
 Review comment:
   MutableInt
   (AtomicInteger implies multi-threading)

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