wonook commented on a change in pull request #28: [NEMO-12] Frontend support 
for Scala Spark
URL: https://github.com/apache/incubator-nemo/pull/28#discussion_r193647591
 
 

 ##########
 File path: 
compiler/frontend/spark/src/main/java/edu/snu/nemo/compiler/frontend/spark/core/SparkFrontendUtils.java
 ##########
 @@ -102,9 +112,13 @@ public static Serializer deriveSerializerFrom(final 
SparkContext sparkContext) {
       // TODO #740: remove this part, and make it properly transfer with 
executor.
       File file = new File(resultFile + i);
       while (file.exists()) {
-        try (final FileInputStream fin = new FileInputStream(file)) {
-          try (final ObjectInputStream ois = new ObjectInputStream(fin)) {
-            result.addAll((List<T>) ois.readObject());
+        try (
+            final FileInputStream fis = new FileInputStream(file);
+            final ObjectInputStream dis = new ObjectInputStream(fis)
+        ) {
+          final int size = dis.readInt();
 
 Review comment:
   Can add a little note referencing it to the `CollectTransform`'s `close` 
method, to make it easier for readers to link the part to each other?

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