org.apache.hadoop.mapred
Class TaskCompletionEvent

java.lang.Object
  org.apache.hadoop.mapred.TaskCompletionEvent

All Implemented Interfaces:

Writable

public class TaskCompletionEvent
extends Object
implements Writable

This is used to track task completion events on job tracker.

Nested Class Summary

static class

TaskCompletionEvent.Status

Field Summary

static TaskCompletionEvent[]

EMPTY_ARRAY

Constructor Summary

TaskCompletionEvent()
Default constructor for Writable.

TaskCompletionEvent(int eventId, String taskId, int idWithinJob, boolean isMap, TaskCompletionEvent.Status status, String taskTrackerHttp)
Constructor.

Method Summary

int	getEventId() Returns event Id.
String	getTaskId() Returns task id.
TaskCompletionEvent.Status	getTaskStatus() Returns enum Status.SUCESS or Status.FAILURE.
String	getTaskTrackerHttp() http location of the tasktracker where this task ran.
int	idWithinJob()
boolean	isMapTask()
void	readFields(DataInput in) Reads the fields of this object from in.
void	setEventId(int eventId) set event Id.
void	setTaskId(String taskId) Sets task id.
void	setTaskStatus(TaskCompletionEvent.Status status) Set task status.
void	setTaskTrackerHttp(String taskTrackerHttp) Set task tracker http location.
String	toString()
void	write(DataOutput out) Writes the fields of this object to out.

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY_ARRAY

public static final TaskCompletionEvent[] EMPTY_ARRAY

Constructor Detail

TaskCompletionEvent

public TaskCompletionEvent()

Default constructor for Writable.

TaskCompletionEvent

public TaskCompletionEvent(int eventId,
                           String taskId,
                           int idWithinJob,
                           boolean isMap,
                           TaskCompletionEvent.Status status,
                           String taskTrackerHttp)

Constructor. eventId should be created externally and incremented per event for each job.

Parameters:

eventId - event id, event id should be unique and assigned in incrementally, starting from 0.

taskId - task id

status - task's status

taskTrackerHttp - task tracker's host:port for http.

Method Detail

getEventId

public int getEventId()

Returns event Id.

Returns:

event id

getTaskId

public String getTaskId()

Returns task id.

Returns:

task id

getTaskStatus

public TaskCompletionEvent.Status getTaskStatus()

Returns enum Status.SUCESS or Status.FAILURE.

Returns:

task tracker status

getTaskTrackerHttp

public String getTaskTrackerHttp()

http location of the tasktracker where this task ran.

Returns:

http location of tasktracker user logs

setEventId

public void setEventId(int eventId)

set event Id. should be assigned incrementally starting from 0.

Parameters:

eventId -

setTaskId

public void setTaskId(String taskId)

Sets task id.

Parameters:

taskId -

setTaskStatus

public void setTaskStatus(TaskCompletionEvent.Status status)

Set task status.

Parameters:

status -

setTaskTrackerHttp

public void setTaskTrackerHttp(String taskTrackerHttp)

Set task tracker http location.

Parameters:

taskTrackerHttp -

toString

public String toString()

Overrides:

toString in class Object

isMapTask

public boolean isMapTask()

idWithinJob

public int idWithinJob()

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Writes the fields of this object to out.

Specified by:

write in interface Writable

Throws:

IOException

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Reads the fields of this object from in. For efficiency, implementations should attempt to re-use storage in the existing object where possible.

Specified by:

readFields in interface Writable

Throws:

IOException