org.apache.hadoop.streaming

Class StreamUtil

java.lang.Object

org.apache.hadoop.streaming.StreamUtil

@InterfaceAudience.Private
public class StreamUtil
extends Object

Utilities used in streaming

Constructor Summary

Constructors

Constructor and Description
StreamUtil()

Method Summary

Methods

Modifier and Type	Method and Description
static String	findInClasspath(String className)
static String	findInClasspath(String className, ClassLoader loader)
static Class	goodClassOrNull(org.apache.hadoop.conf.Configuration conf, String className, 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 String	regexpEscape(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 Class goodClassOrNull(org.apache.hadoop.conf.Configuration conf,
                    String className,
                    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 String findInClasspath(String className)

findInClasspath

public static String findInClasspath(String className,
                     ClassLoader loader)

Returns:

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

regexpEscape

public static String regexpEscape(String plain)

isLocalJobTracker

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