org.apache.hadoop.mapred

Class WrappedJvmID

java.lang.Object

org.apache.hadoop.mapreduce.ID

org.apache.hadoop.mapred.ID

org.apache.hadoop.mapred.WrappedJvmID

All Implemented Interfaces:

Comparable<ID>, Writable, WritableComparable<ID>

public class WrappedJvmID
extends ID

A simple wrapper for increasing the visibility.

Field Summary

Fields inherited from class org.apache.hadoop.mapreduce.ID

id, SEPARATOR

Constructor Summary

Constructors

Constructor and Description
WrappedJvmID(JobID jobID, boolean mapTask, int nextInt)

Method Summary

Methods

Modifier and Type	Method and Description
protected StringBuilder	appendTo(StringBuilder builder) Add the unique id to the given StringBuilder.
int	compareTo(ID o) Compare TaskInProgressIds by first jobIds, then by tip numbers.
boolean	equals(Object o)
static org.apache.hadoop.mapred.JVMId	forName(String str) Construct a JVMId object from given string
JobID	getJobId()
int	hashCode()
boolean	isMapJVM()
void	readFields(DataInput in) Deserialize the fields of this object from in.
String	toString()
void	write(DataOutput out) Serialize the fields of this object to out.

Methods inherited from class org.apache.hadoop.mapreduce.ID

getId

Methods inherited from class java.lang.Object

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

Constructor Detail

WrappedJvmID

public WrappedJvmID(JobID jobID,
            boolean mapTask,
            int nextInt)

Method Detail

isMapJVM

public boolean isMapJVM()

getJobId

public JobID getJobId()

equals

public boolean equals(Object o)

Overrides:

equals in class ID

compareTo

public int compareTo(ID o)

Compare TaskInProgressIds by first jobIds, then by tip numbers. Reduces are defined as greater then maps.

Specified by:

compareTo in interface Comparable<ID>

Overrides:

compareTo in class ID

toString

public String toString()

Overrides:

toString in class ID

appendTo

protected StringBuilder appendTo(StringBuilder builder)

Add the unique id to the given StringBuilder.

Parameters:

builder - the builder to append to

Returns:

the passed in builder.

hashCode

public int hashCode()

Overrides:

hashCode in class ID

readFields

public void readFields(DataInput in)
                throws IOException

Description copied from interface: Writable

Deserialize 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

Overrides:

readFields in class ID

Parameters:

in - DataInput to deseriablize this object from.

Throws:

IOException

write

public void write(DataOutput out)
           throws IOException

Description copied from interface: Writable

Serialize the fields of this object to out.

Specified by:

write in interface Writable

Overrides:

write in class ID

Parameters:

out - DataOuput to serialize this object into.

Throws:

IOException

forName

public static org.apache.hadoop.mapred.JVMId forName(String str)
                                              throws IllegalArgumentException

Construct a JVMId object from given string

Returns:

constructed JVMId object or null if the given String is null

Throws:

IllegalArgumentException - if the given string is malformed