@Override
    public String toString() {
      return "NodeInfo{" + "instance=" + serviceInstance
          + ", expireTimeMillis=" + expireTimeMillis + ", numSuccessfulTasks=" + numSuccessfulTasks
          + ", numSuccessfulTasksAtLastBlacklist=" + numSuccessfulTasksAtLastBlacklist
          + ", cumulativeBackoffFactor=" + cumulativeBackoffFactor
          + ", numSchedulableTasks=" + numSchedulableTasks
          + ", numScheduledTasks=" + numScheduledTasks
          + ", disabled=" + disabled
          + ", commFailures=" + hadCommFailure
          +'}';
    }
@return the time at which this node will be re-enabled
llap-tez/src/java/org/apache/hadoop/hive/llap/tezplugins/LlapTaskSchedulerService.java