wonook commented on a change in pull request #73: [Nemo-62] Support Multiple 
Jobs Submission in a Single User Program
URL: https://github.com/apache/incubator-nemo/pull/73#discussion_r202254889
 
 

 ##########
 File path: client/src/main/java/edu/snu/nemo/client/JobLauncher.java
 ##########
 @@ -309,9 +361,13 @@ public static Configuration getBuiltJobConf() {
   /**
    * Get the collected data.
    *
+   * @param <T> the type of the data.
    * @return the collected data.
    */
   public static <T> List<T> getCollectedData() {
-    return (List<T>) collectedData;
+    final List<T> result = new ArrayList<>();
+    result.addAll((List<T>) COLLECTED_DATA);
+    COLLECTED_DATA.clear(); // flush after fetching.
+    return result;
   }
 
 Review comment:
   As the data can be collected multiple times in an application, I've made the 
change that ensures that the buffer is cleared every time of the function call 
to collect()

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