sanha commented on a change in pull request #2: [NEMO-7] Intra-TaskGroup 
pipelining
URL: https://github.com/apache/incubator-nemo/pull/2#discussion_r173049301
 
 

 ##########
 File path: 
runtime/executor/src/main/java/edu/snu/nemo/runtime/executor/datatransfer/InputReader.java
 ##########
 @@ -39,12 +39,15 @@
 import java.util.stream.Collectors;
 import java.util.stream.Stream;
 import java.util.stream.StreamSupport;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Represents the input data transfer to a task.
  * TODO #492: Modularize the data communication pattern.
  */
 public final class InputReader extends DataTransfer {
+  private static final Logger LOG = 
LoggerFactory.getLogger(InputReader.class.getName());
   private final int dstTaskIndex;
   private final BlockManagerWorker blockManagerWorker;
 
 
 Review comment:
   Let's remove the `Nullable` and TODO in 
[L64](https://github.com/apache/incubator-nemo/pull/2/files#diff-6e5f21bb9201dea0f42ed3126467ef34R64).

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