Package org.apache.hadoop.mapred.nativetask

Class HadoopPlatform

java.lang.Object

org.apache.hadoop.mapred.nativetask.Platform

org.apache.hadoop.mapred.nativetask.HadoopPlatform

@Private
public class HadoopPlatform
extends Platform

Field Summary

Fields inherited from class org.apache.hadoop.mapred.nativetask.Platform

keyClassNames

Constructor Summary

Constructors

Constructor	Description
HadoopPlatform()

Method Summary

Modifier and Type	Method	Description
boolean	define(java.lang.Class<?> comparatorClass)	whether it's the platform that has defined a custom Java comparator NativeTask doesn't support custom Java comparators (set with mapreduce.job.output.key.comparator.class) but a platform (e.g Pig) could also set that conf and implement native comparators so we shouldn't bail out.
void	init()	initialize a platform, where we should call registerKey
java.lang.String	name()
boolean	support(java.lang.String keyClassName, INativeSerializer<?> serializer, org.apache.hadoop.mapred.JobConf job)	whether a platform supports a specific key should at least satisfy two conditions 1.

Methods inherited from class org.apache.hadoop.mapred.nativetask.Platform

registerKey

Methods inherited from class java.lang.Object

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

Constructor Detail

HadoopPlatform

public HadoopPlatform()
               throws java.io.IOException

Throws:

java.io.IOException

Method Detail

init

public void init()
          throws java.io.IOException

Description copied from class: Platform

initialize a platform, where we should call registerKey

Specified by:

init in class Platform

Throws:

java.io.IOException

support

public boolean support(java.lang.String keyClassName,
                       INativeSerializer<?> serializer,
                       org.apache.hadoop.mapred.JobConf job)

Description copied from class: Platform

whether a platform supports a specific key should at least satisfy two conditions 1. the key belongs to the platform 2. the associated serializer must implement INativeComparable interface

Specified by:

support in class Platform

Parameters:

keyClassName - map out put key class name

serializer - serializer associated with key via registerKey

job - job configuration

Returns:

true if the platform has implemented native comparators of the key and false otherwise

define

public boolean define(java.lang.Class<?> comparatorClass)

Description copied from class: Platform

whether it's the platform that has defined a custom Java comparator NativeTask doesn't support custom Java comparators (set with mapreduce.job.output.key.comparator.class) but a platform (e.g Pig) could also set that conf and implement native comparators so we shouldn't bail out.

Specified by:

define in class Platform

Parameters:

comparatorClass - comparator set with mapreduce.job.output.key.comparator.class

name

public java.lang.String name()

Specified by:

name in class Platform

Returns:

name of a Platform, useful for logs and debug