org.apache.hadoop.yarn.server.nodemanager

Class NodeHealthCheckerService

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.service.CompositeService

org.apache.hadoop.yarn.server.nodemanager.NodeHealthCheckerService

All Implemented Interfaces:

Closeable, AutoCloseable, Service

public class NodeHealthCheckerService
extends CompositeService

The class which provides functionality of checking the health of the node and reporting back to the service for which the health checker has been asked to report.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.service.CompositeService

CompositeService.CompositeServiceShutdownHook

Nested classes/interfaces inherited from interface org.apache.hadoop.service.Service

Service.STATE

Field Summary

Fields inherited from class org.apache.hadoop.service.CompositeService

STOP_ONLY_STARTED_SERVICES

Constructor Summary

Constructors

Constructor and Description
NodeHealthCheckerService()

Method Summary

Methods

Modifier and Type	Method and Description
LocalDirsHandlerService	getDiskHandler()
protected void	serviceInit(Configuration conf) All initialization code needed by a service.

Methods inherited from class org.apache.hadoop.service.CompositeService

addIfService, addService, getServices, removeService, serviceStart, serviceStop

Methods inherited from class org.apache.hadoop.service.AbstractService

close, getBlockers, getConfig, getFailureCause, getFailureState, getLifecycleHistory, getName, getServiceState, getStartTime, init, isInState, noteFailure, putBlocker, registerGlobalListener, registerServiceListener, removeBlocker, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NodeHealthCheckerService

public NodeHealthCheckerService()

Method Detail

serviceInit

protected void serviceInit(Configuration conf)
                    throws Exception

Description copied from class: AbstractService

All initialization code needed by a service. This method will only ever be called once during the lifecycle of a specific service instance. Implementations do not need to be synchronized as the logic in AbstractService.init(Configuration) prevents re-entrancy. The base implementation checks to see if the subclass has created a new configuration instance, and if so, updates the base class value

Overrides:

serviceInit in class CompositeService

Parameters:

conf - configuration

Throws:

Exception - on a failure -these will be caught, possibly wrapped, and wil; trigger a service stop

getDiskHandler

public LocalDirsHandlerService getDiskHandler()

Returns:

the disk handler