sanha commented on a change in pull request #2: [NEMO-7] Intra-TaskGroup 
pipelining
URL: https://github.com/apache/incubator-nemo/pull/2#discussion_r173050492
 
 

 ##########
 File path: 
runtime/executor/src/main/java/edu/snu/nemo/runtime/executor/TaskGroupExecutor.java
 ##########
 @@ -60,13 +55,27 @@
   private final DataTransferFactory channelFactory;
   private final MetricCollector metricCollector;
 
-  /**
-   * Map of task IDs in this task group to their readers/writers.
-   */
-  private final Map<String, List<InputReader>> physicalTaskIdToInputReaderMap;
-  private final Map<String, List<OutputWriter>> 
physicalTaskIdToOutputWriterMap;
+  private final List<InputReader> inputReaders;
 
 Review comment:
   Why do we have to maintain the list and map of `InputReader`s at the same 
time?

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