Package org.apache.hadoop.mapreduce.v2.api.records

Class TaskId

java.lang.Object

org.apache.hadoop.mapreduce.v2.api.records.TaskId

All Implemented Interfaces:

java.lang.Comparable<TaskId>

Direct Known Subclasses:

TaskIdPBImpl

public abstract class TaskId
extends java.lang.Object
implements java.lang.Comparable<TaskId>

TaskId represents the unique identifier for a Map or Reduce Task.

TaskId consists of 3 parts. First part is JobId, that this Task belongs to. Second part of the TaskId is either 'm' or 'r' representing whether the task is a map task or a reduce task. And the third part is the task number.

Field Summary

Fields

Modifier and Type	Field	Description
protected static java.lang.String	TASK

Constructor Summary

Constructors

Constructor	Description
TaskId()

Method Summary

Modifier and Type	Method	Description
int	compareTo(TaskId other)
boolean	equals(java.lang.Object obj)
abstract int	getId()
abstract JobId	getJobId()
abstract TaskType	getTaskType()
int	hashCode()
abstract void	setId(int id)
abstract void	setJobId(JobId jobId)
abstract void	setTaskType(TaskType taskType)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

TASK

protected static final java.lang.String TASK

See Also:

Constant Field Values

Constructor Detail

TaskId

public TaskId()

Method Detail

getJobId

public abstract JobId getJobId()

Returns:

the associated JobId

getTaskType

public abstract TaskType getTaskType()

Returns:

the type of the task - MAP/REDUCE

getId

public abstract int getId()

Returns:

the task number.

setJobId

public abstract void setJobId(JobId jobId)

setTaskType

public abstract void setTaskType(TaskType taskType)

setId

public abstract void setId(int id)

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object obj)

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

compareTo

public int compareTo(TaskId other)

Specified by:

compareTo in interface java.lang.Comparable<TaskId>