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

Class JobId

java.lang.Object

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

All Implemented Interfaces:

Comparable<JobId>

Direct Known Subclasses:

JobIdPBImpl

public abstract class JobId
extends Object
implements Comparable<JobId>

JobId represents the globally unique identifier for a MapReduce job.

The globally unique nature of the identifier is achieved by using the cluster timestamp from the associated ApplicationId. i.e. start-time of the ResourceManager along with a monotonically increasing counter for the jobId.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	JOB
protected static char	SEPARATOR

Constructor Summary

Constructors

Constructor and Description
JobId()

Method Summary

Modifier and Type	Method and Description
int	compareTo(JobId other)
boolean	equals(Object obj)
abstract org.apache.hadoop.yarn.api.records.ApplicationId	getAppId() Get the associated ApplicationId which represents the start time of the ResourceManager and is used to generate the globally unique JobId.
abstract int	getId() Get the short integer identifier of the JobId which is unique for all applications started by a particular instance of the ResourceManager.
int	hashCode()
abstract void	setAppId(org.apache.hadoop.yarn.api.records.ApplicationId appId)
abstract void	setId(int id)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

JOB

protected static final String JOB

See Also:

Constant Field Values

SEPARATOR

protected static final char SEPARATOR

See Also:

Constant Field Values

Constructor Detail

JobId

public JobId()

Method Detail

getAppId

public abstract org.apache.hadoop.yarn.api.records.ApplicationId getAppId()

Get the associated ApplicationId which represents the start time of the ResourceManager and is used to generate the globally unique JobId.

Returns:

associated ApplicationId

getId

public abstract int getId()

Get the short integer identifier of the JobId which is unique for all applications started by a particular instance of the ResourceManager.

Returns:

short integer identifier of the JobId

setAppId

public abstract void setAppId(org.apache.hadoop.yarn.api.records.ApplicationId appId)

setId

public abstract void setId(int id)

toString

public String toString()

Overrides:

toString in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object

compareTo

public int compareTo(JobId other)

Specified by:

compareTo in interface Comparable<JobId>