org.apache.hadoop.mapreduce.jobhistory
Class JobHistoryEventHandler

java.lang.Object
  org.apache.hadoop.yarn.service.AbstractService
      org.apache.hadoop.mapreduce.jobhistory.JobHistoryEventHandler

All Implemented Interfaces:

org.apache.hadoop.yarn.event.EventHandler<JobHistoryEvent>, org.apache.hadoop.yarn.service.Service

public class JobHistoryEventHandler
extends org.apache.hadoop.yarn.service.AbstractService
implements org.apache.hadoop.yarn.event.EventHandler<JobHistoryEvent>

The job history events get routed to this class. This class writes the Job history events to the DFS directly into a staging dir and then moved to a done-dir. JobHistory implementation is in this package to access package private classes.

Nested Class Summary

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

org.apache.hadoop.yarn.service.Service.STATE

Field Summary

protected Thread	eventHandlingThread
protected BlockingQueue<JobHistoryEvent>	eventQueue

Constructor Summary

JobHistoryEventHandler(AppContext context, int startCount)

Method Summary

protected void	closeEventWriter(org.apache.hadoop.mapreduce.v2.api.records.JobId jobId)
void	closeWriter(org.apache.hadoop.mapreduce.v2.api.records.JobId id) Close the event writer for this id
protected org.apache.hadoop.mapreduce.jobhistory.EventWriter	createEventWriter(org.apache.hadoop.fs.Path historyFilePath)
void	handle(JobHistoryEvent event)
protected void	handleEvent(JobHistoryEvent event)
void	init(org.apache.hadoop.conf.Configuration conf)
void	processEventForJobSummary(org.apache.hadoop.mapreduce.jobhistory.HistoryEvent event, JobSummary summary, org.apache.hadoop.mapreduce.v2.api.records.JobId jobId)
protected void	setupEventWriter(org.apache.hadoop.mapreduce.v2.api.records.JobId jobId) Create an event writer for the Job represented by the jobID.
void	start()
void	stop()

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

getConfig, getName, getServiceState, getStartTime, register, unregister

Methods inherited from class java.lang.Object

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

Field Detail

eventQueue

protected BlockingQueue<JobHistoryEvent> eventQueue

eventHandlingThread

protected Thread eventHandlingThread

Constructor Detail

JobHistoryEventHandler

public JobHistoryEventHandler(AppContext context,
                              int startCount)

Method Detail

init

public void init(org.apache.hadoop.conf.Configuration conf)

Specified by:

init in interface org.apache.hadoop.yarn.service.Service

Overrides:

init in class org.apache.hadoop.yarn.service.AbstractService

start

public void start()

Specified by:

start in interface org.apache.hadoop.yarn.service.Service

Overrides:

start in class org.apache.hadoop.yarn.service.AbstractService

stop

public void stop()

Specified by:

stop in interface org.apache.hadoop.yarn.service.Service

Overrides:

stop in class org.apache.hadoop.yarn.service.AbstractService

createEventWriter

protected org.apache.hadoop.mapreduce.jobhistory.EventWriter createEventWriter(org.apache.hadoop.fs.Path historyFilePath)
                                                                        throws IOException

Throws:

IOException

setupEventWriter

protected void setupEventWriter(org.apache.hadoop.mapreduce.v2.api.records.JobId jobId)
                         throws IOException

Create an event writer for the Job represented by the jobID. Writes out the job configuration to the log directory. This should be the first call to history for a job

Parameters:

jobId - the jobId.

Throws:

IOException

closeWriter

public void closeWriter(org.apache.hadoop.mapreduce.v2.api.records.JobId id)
                 throws IOException

Close the event writer for this id

Throws:

IOException

handle

public void handle(JobHistoryEvent event)

Specified by:

handle in interface org.apache.hadoop.yarn.event.EventHandler<JobHistoryEvent>

handleEvent

protected void handleEvent(JobHistoryEvent event)

processEventForJobSummary

public void processEventForJobSummary(org.apache.hadoop.mapreduce.jobhistory.HistoryEvent event,
                                      JobSummary summary,
                                      org.apache.hadoop.mapreduce.v2.api.records.JobId jobId)

closeEventWriter

protected void closeEventWriter(org.apache.hadoop.mapreduce.v2.api.records.JobId jobId)
                         throws IOException

Throws:

IOException