org.apache.hadoop.mapred

Class LocalContainerLauncher

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.mapred.LocalContainerLauncher

All Implemented Interfaces:

Closeable, AutoCloseable, ContainerLauncher, Service, EventHandler<ContainerLauncherEvent>

public class LocalContainerLauncher
extends AbstractService
implements ContainerLauncher

Runs the container task locally in a thread. Since all (sub)tasks share the same local directory, they must be executed sequentially in order to avoid creating/deleting the same files/dirs.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.hadoop.mapreduce.v2.app.launcher.ContainerLauncher

ContainerLauncher.EventType

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

Service.STATE

Constructor Summary

Constructors

Constructor and Description
LocalContainerLauncher(AppContext context, TaskUmbilicalProtocol umbilical)

Method Summary

Methods

Modifier and Type	Method and Description
void	handle(ContainerLauncherEvent event)
void	serviceStart() Actions called during the INITED to STARTED transition.
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, serviceInit, 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

LocalContainerLauncher

public LocalContainerLauncher(AppContext context,
                      TaskUmbilicalProtocol umbilical)

Method Detail

serviceStart

public void serviceStart()
                  throws Exception

Description copied from class: AbstractService

Actions called during the INITED to STARTED transition. 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.start() prevents re-entrancy.

Overrides:

serviceStart in class AbstractService

Throws:

Exception - if needed -these will be caught, wrapped, and trigger a service stop

serviceStop

public 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(ContainerLauncherEvent event)

Specified by:

handle in interface EventHandler<ContainerLauncherEvent>