Package org.apache.hadoop.streaming

Class StreamUtil

java.lang.Object

org.apache.hadoop.streaming.StreamUtil

@Private
public class StreamUtil
extends java.lang.Object

Utilities used in streaming

Constructor Summary

Constructors

Constructor	Description
StreamUtil()

Method Summary

Modifier and Type	Method	Description
static java.lang.String	findInClasspath(java.lang.String className)
static java.lang.String	findInClasspath(java.lang.String className, java.lang.ClassLoader loader)
static java.lang.String	getHost()
static java.lang.Class	goodClassOrNull(org.apache.hadoop.conf.Configuration conf, java.lang.String className, java.lang.String defaultPackage)	It may seem strange to silently switch behaviour when a String is not a classname; the reason is simplified Usage:
static boolean	isLocalJobTracker(org.apache.hadoop.mapred.JobConf job)
static java.lang.String	regexpEscape(java.lang.String plain)

Methods inherited from class java.lang.Object

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

Constructor Detail

StreamUtil

public StreamUtil()

Method Detail

goodClassOrNull

public static java.lang.Class goodClassOrNull(org.apache.hadoop.conf.Configuration conf,
                                              java.lang.String className,
                                              java.lang.String defaultPackage)

It may seem strange to silently switch behaviour when a String is not a classname; the reason is simplified Usage:

 -mapper [classname | program ]
 instead of the explicit Usage:
 [-mapper program | -javamapper classname], -mapper and -javamapper are mutually exclusive.
 (repeat for -reducer, -combiner) 

findInClasspath

public static java.lang.String findInClasspath(java.lang.String className)

findInClasspath

public static java.lang.String findInClasspath(java.lang.String className,
                                               java.lang.ClassLoader loader)

Returns:

a jar file path or a base directory or null if not found.

regexpEscape

public static java.lang.String regexpEscape(java.lang.String plain)

getHost

public static java.lang.String getHost()

isLocalJobTracker

public static boolean isLocalJobTracker(org.apache.hadoop.mapred.JobConf job)