sanha commented on a change in pull request #2: [NEMO-7] Intra-TaskGroup 
pipelining
URL: https://github.com/apache/incubator-nemo/pull/2#discussion_r173050042
 
 

 ##########
 File path: 
runtime/executor/src/main/java/edu/snu/nemo/runtime/executor/TaskGroupExecutor.java
 ##########
 @@ -27,28 +27,23 @@
 import edu.snu.nemo.runtime.common.plan.RuntimeEdge;
 import edu.snu.nemo.runtime.common.plan.physical.*;
 import edu.snu.nemo.runtime.common.state.TaskGroupState;
-import edu.snu.nemo.runtime.common.state.TaskState;
 import edu.snu.nemo.runtime.executor.data.DataUtil;
-import edu.snu.nemo.runtime.executor.datatransfer.DataTransferFactory;
-import edu.snu.nemo.runtime.executor.datatransfer.InputReader;
-import edu.snu.nemo.runtime.executor.datatransfer.OutputCollectorImpl;
-import edu.snu.nemo.runtime.executor.datatransfer.OutputWriter;
+import edu.snu.nemo.runtime.executor.datatransfer.*;
 
 import java.util.*;
-import java.util.concurrent.BlockingQueue;
-import java.util.concurrent.CompletableFuture;
-import java.util.concurrent.ExecutionException;
-import java.util.concurrent.LinkedBlockingQueue;
+import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicInteger;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-import java.util.stream.Collectors;
+
 
 Review comment:
   Please remove this redundant newline.

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