org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher

Class ContainersLauncher

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.yarn.server.nodemanager.containermanager.launcher.ContainersLauncher

All Implemented Interfaces:

Closeable, AutoCloseable, Service, EventHandler<ContainersLauncherEvent>

public class ContainersLauncher
extends AbstractService
implements EventHandler<ContainersLauncherEvent>

The launcher for the containers. This service should be started only after the ResourceLocalizationService is started as it depends on creation of system directories on the local file-system.

Nested Class Summary

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

Service.STATE

Field Summary

Fields

Modifier and Type	Field and Description
ExecutorService	containerLauncher
Map<ContainerId,ContainerLaunch>	running

Constructor Summary

Constructors

Constructor and Description
ContainersLauncher(Context context, Dispatcher dispatcher, ContainerExecutor exec, LocalDirsHandlerService dirsHandler, ContainerManagerImpl containerManager)

Method Summary

Methods

Modifier and Type	Method and Description
void	handle(ContainersLauncherEvent event)
protected void	serviceInit(Configuration conf) All initialization code needed by a service.
protected void	serviceStop() Actions called during the transition to the STOPPED state.

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, setConfig, start, stop, toString, unregisterGlobalListener, unregisterServiceListener, waitForServiceToStop

Methods inherited from class java.lang.Object

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

Field Detail

containerLauncher

public ExecutorService containerLauncher

running

public final Map<ContainerId,ContainerLaunch> running

Constructor Detail

ContainersLauncher

public ContainersLauncher(Context context,
                  Dispatcher dispatcher,
                  ContainerExecutor exec,
                  LocalDirsHandlerService dirsHandler,
                  ContainerManagerImpl containerManager)

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

serviceStop

protected void serviceStop()
                    throws Exception

Description copied from class: AbstractService

Actions called during the transition to the STOPPED state. 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.stop() prevents re-entrancy. Implementations MUST write this to be robust against failures, including checks for null references -and for the first failure to not stop other attempts to shut down parts of the service.

Overrides:

serviceStop in class AbstractService

Throws:

Exception - if needed -these will be caught and logged.

handle

public void handle(ContainersLauncherEvent event)

Specified by:

handle in interface EventHandler<ContainersLauncherEvent>