org.apache.hadoop.yarn.server.resourcemanager

Class NodesListManager

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.yarn.server.resourcemanager.NodesListManager

All Implemented Interfaces:

Closeable, AutoCloseable, Service, EventHandler<NodesListManagerEvent>

public class NodesListManager
extends AbstractService
implements EventHandler<NodesListManagerEvent>

Nested Class Summary

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

Service.STATE

Constructor Summary

Constructors

Constructor and Description
NodesListManager(RMContext rmContext)

Method Summary

Methods

Modifier and Type	Method and Description
int	getUnusableNodes(Collection<RMNode> unUsableNodes) Provides the currently unusable nodes.
void	handle(NodesListManagerEvent event)
boolean	isValidNode(String hostName)
void	refreshNodes(Configuration yarnConf)
protected void	serviceInit(Configuration conf) All initialization code needed by a service.

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, serviceStart, serviceStop, 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

NodesListManager

public NodesListManager(RMContext rmContext)

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 AbstractService

Parameters:

conf - configuration

Throws:

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

refreshNodes

public void refreshNodes(Configuration yarnConf)
                  throws IOException

Throws:

IOException

isValidNode

public boolean isValidNode(String hostName)

getUnusableNodes

public int getUnusableNodes(Collection<RMNode> unUsableNodes)

Provides the currently unusable nodes. Copies it into provided collection.

Parameters:

unUsableNodes - Collection to which the unusable nodes are added

Returns:

number of unusable nodes added

handle

public void handle(NodesListManagerEvent event)

Specified by:

handle in interface EventHandler<NodesListManagerEvent>