org.apache.hadoop.mapreduce.jobhistory

Class JobHistoryCopyService

java.lang.Object

org.apache.hadoop.service.AbstractService

org.apache.hadoop.service.CompositeService

org.apache.hadoop.mapreduce.jobhistory.JobHistoryCopyService

All Implemented Interfaces:

Closeable, AutoCloseable, HistoryEventHandler, Service

public class JobHistoryCopyService
extends CompositeService
implements HistoryEventHandler

Reads in history events from the JobHistoryFile and sends them out again to be recorded.

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
JobHistoryCopyService(ApplicationAttemptId applicationAttemptId, EventHandler handler)

Method Summary

Methods

Modifier and Type	Method and Description
static FSDataInputStream	getPreviousJobHistoryFileStream(Configuration conf, ApplicationAttemptId applicationAttemptId)
void	handleEvent(HistoryEvent event)
protected void	serviceInit(Configuration conf) All initialization code needed by a service.
protected void	serviceStart() Actions called during the INITED to STARTED transition.

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

addIfService, addService, getServices, removeService, 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

JobHistoryCopyService

public JobHistoryCopyService(ApplicationAttemptId applicationAttemptId,
                     EventHandler handler)

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

handleEvent

public void handleEvent(HistoryEvent event)
                 throws IOException

Specified by:

handleEvent in interface HistoryEventHandler

Throws:

IOException

serviceStart

protected 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 CompositeService

Throws:

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

getPreviousJobHistoryFileStream

public static FSDataInputStream getPreviousJobHistoryFileStream(Configuration conf,
                                                ApplicationAttemptId applicationAttemptId)
                                                         throws IOException

Throws:

IOException