taegeonum commented on a change in pull request #277: [NEMO-429] SWPP TEAM2 
Code Smell Fix
URL: https://github.com/apache/incubator-nemo/pull/277#discussion_r352934913
 
 

 ##########
 File path: 
runtime/executor/src/main/java/org/apache/nemo/runtime/executor/datatransfer/InputWatermarkManager.java
 ##########
 @@ -27,7 +27,7 @@
  * --edge 2-->  watermarkManager --(emitWatermark)--> nextOperator
  * --edge 3-->
  */
-public interface InputWatermarkManager {
+public interface InputWatermarkManager implements Serializable {
 
 Review comment:
   please remove `implements Serializable`

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