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// '+' denotes addition, '-' deletion.
public interface TaskNameGrouper {
  + @deprecated
  Set<ContainerModel> group(Set<TaskModel> tasks);

  + @deprecated
  default Set<ContainerModel> group(Set<TaskModel> tasks, List<String> containersIds) {
    return group(tasks);
  }
  +   Set<ContainerModel> group(Set<TaskModel> currentGenerationTaskModels, List<String> currentGenerationContainerIdscurrentGenerationProcessorIds, Set<ContainerModel> previousGenerationContainerModels);
}

public interface BalancingTaskNameGrouper extends TaskNameGrouper {
  + @deprecated 
  Set<ContainerModel> balance(Set<TaskModel> tasks, LocalityManager localityManager);
}

public class ContainerModel {
  - @Deprecated
  - private final int containerId;
  private final String processorId;
  private final Map<TaskName, TaskModel> tasks;
  + // New field added denoting the physical hostname.
  + private final String hostName;