johnyangk commented on a change in pull request #2: [NEMO-7] Intra-TaskGroup 

 File path: 
 @@ -60,13 +55,36 @@
   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>> 
-  private boolean isExecutionRequested;
+  // Map of task ID to its intra-TaskGroup data pipe.
+  private final Map<Task, List<LocalPipe>> taskToInputPipesMap;
+  private final Map<Task, LocalPipe> taskToOutputPipeMap;  // one and only one 
Pipe per task
+  // Readers/writers that deals with inter-TaskGroup data.
+  private final List<InputReader> inputReaders;
+  private final Map<Task, List<InputReader>> taskToInputReadersMap;
+  private final Map<Task, List<InputReader>> taskToSideInputReadersMap;
+  private final Map<Task, List<OutputWriter>> taskToOutputWritersMap;
+  private final Map<InputReader, List<Task>> inputReaderToTasksMap;
+  private final Map<String, Iterator> idToSrcIteratorMap;
+  private final Map<String, List<Task>> srcIteratorIdToTasksMap;
+  private final Map<String, List<Task>> iteratorIdToTasksMap;
+  private final LinkedBlockingQueue<Pair<String, 
DataUtil.IteratorWithNumBytes>> iteratorQueue;
+  private volatile Map<String, List<Task>> pipeIdToDstTasksMap;
+  private final Set<Transform> preparedTransforms;
+  private final Set<String> finishedTaskIds;
+  private final AtomicInteger completedFutures;
+  private int numBoundedSources;
+  private int numIterators;
+  // For metrics
 Review comment:
   Can you refactor these variables into a separate class?

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