Package org.apache.hadoop.mapred.nativetask

Class NativeRuntime

java.lang.Object

org.apache.hadoop.mapred.nativetask.NativeRuntime

@Private
public class NativeRuntime
extends java.lang.Object

This class stands for the native runtime It has three functions: 1. Create native handlers for map, reduce, outputcollector, etc 2. Configure native task with provided MR configs 3. Provide file system api to native space, so that it can use File system like HDFS.

Constructor Summary

Constructors

Constructor	Description
NativeRuntime()

Method Summary

Modifier and Type	Method	Description
static void	configure(org.apache.hadoop.conf.Configuration jobConf)
static long	createNativeObject(java.lang.String clazz)	create native object We use it to create native handlers
static boolean	isNativeLibraryLoaded()
static long	registerLibrary(java.lang.String libraryName, java.lang.String clazz)	Register a customized library
static void	releaseNativeObject(long addr)	destroy native object We use to destroy native handlers
static void	reportStatus(org.apache.hadoop.mapred.Task.TaskReporter reporter)	Get the status report from native space
static boolean	supportsCompressionCodec(byte[] codec)	Check whether the native side has compression codec support built in

Methods inherited from class java.lang.Object

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

Constructor Detail

NativeRuntime

public NativeRuntime()

Method Detail

isNativeLibraryLoaded

public static boolean isNativeLibraryLoaded()

configure

public static void configure(org.apache.hadoop.conf.Configuration jobConf)

createNativeObject

public static long createNativeObject(java.lang.String clazz)

create native object We use it to create native handlers

registerLibrary

public static long registerLibrary(java.lang.String libraryName,
                                   java.lang.String clazz)

Register a customized library

releaseNativeObject

public static void releaseNativeObject(long addr)

destroy native object We use to destroy native handlers

reportStatus

public static void reportStatus(org.apache.hadoop.mapred.Task.TaskReporter reporter)
                         throws java.io.IOException

Get the status report from native space

Throws:

java.io.IOException

supportsCompressionCodec

public static boolean supportsCompressionCodec(byte[] codec)

Check whether the native side has compression codec support built in