sanha commented on a change in pull request #15: [NEMO-52] Make 
SchedulingPolicy Stackable
URL: https://github.com/apache/incubator-nemo/pull/15#discussion_r187831424
 
 

 ##########
 File path: 
runtime/master/src/main/java/edu/snu/nemo/runtime/master/scheduler/RoundRobinSchedulingPolicy.java
 ##########
 @@ -42,162 +39,27 @@
 public final class RoundRobinSchedulingPolicy implements SchedulingPolicy {
   private static final Logger LOG = 
LoggerFactory.getLogger(RoundRobinSchedulingPolicy.class.getName());
 
-  private final ExecutorRegistry executorRegistry;
-
-  /**
-   * The pool of executors available for each container type.
-   */
-  private final Map<String, List<String>> executorIdByContainerType;
-
-  /**
-   * The index of the next executor to be assigned for each container type.
-   * This map allows the executor index computation of the RR scheduling.
-   */
-  private final Map<String, Integer> nextExecutorIndexByContainerType;
-
   @Inject
-  @VisibleForTesting
-  public RoundRobinSchedulingPolicy(final ExecutorRegistry executorRegistry) {
-    this.executorRegistry = executorRegistry;
-    this.executorIdByContainerType = new HashMap<>();
-    this.nextExecutorIndexByContainerType = new HashMap<>();
-    initializeContainerTypeIfAbsent(ExecutorPlacementProperty.NONE); // Need 
this to avoid potential null errors
+  public RoundRobinSchedulingPolicy() {
 
 Review comment:
   private

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