| Name | Description | Type | Package | Framework |
| AbstractLivelinessMonitor | A simple liveliness monitor with which clients can register, trust the component to monitor liveliness, get a call-back on expiry and then finally | Class | org.apache.hadoop.yarn.util | Apache Hadoop |
| ApplicationClassLoader | This type has been deprecated in favor of ApplicationClassLoader. | Class | org.apache.hadoop.yarn.util | Apache Hadoop |
| ResourceCalculatorProcessTree | Interface class to obtain process resource usage NOTE: This class should not be used by external users, but only by external | Class | org.apache.hadoop.yarn.util | Apache Hadoop |
| SystemClock | clock in milliseconds. | Class | org.apache.hadoop.yarn.util | Apache Hadoop |
| TimelineUtils | The helper class for the timeline module. | Class | org.apache.hadoop.yarn.util.timeline | Apache Hadoop |
| UTCClock | Class | org.apache.hadoop.yarn.util | Apache Hadoop | |