| Package | Description | 
|---|---|
| org.apache.hadoop.service | |
| org.apache.hadoop.service.launcher | This package contains classes, interfaces and exceptions to launch
 YARN services from the command line. | 
| org.apache.hadoop.util | Common utilities. | 
| Class and Description | 
|---|
| AbstractService This is the base implementation class for services. | 
| CompositeService Composition of services. | 
| LifecycleEvent A serializable lifecycle event: the time a state
 transition occurred, and what state was entered. | 
| Service Service LifeCycle. | 
| Service.STATE Service states | 
| ServiceStateChangeListener Interface to notify state changes of a service. | 
| Class and Description | 
|---|
| AbstractService This is the base implementation class for services. | 
| Service Service LifeCycle. | 
| Class and Description | 
|---|
| AbstractService This is the base implementation class for services. | 
| Service Service LifeCycle. | 
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