hadoop 2.7.5 The Event Type That The Scheduler can Accept

public enum SchedulerEventType {

  // Source: Node
  NODE_ADDED,
  NODE_REMOVED,
  NODE_UPDATE,
  NODE_RESOURCE_UPDATE,
  NODE_LABELS_UPDATE,

  // Source: RMApp
  APP_ADDED,
  APP_REMOVED,

  // Source: RMAppAttempt
  APP_ATTEMPT_ADDED,
  APP_ATTEMPT_REMOVED,

  // Source: ContainerAllocationExpirer
  CONTAINER_EXPIRED,

  // Source: RMContainer
  CONTAINER_RESCHEDULED,

  // Source: SchedulingEditPolicy
  DROP_RESERVATION,
  PREEMPT_CONTAINER,
  KILL_CONTAINER
}