org.apache.hadoop.streaming

类 StreamUtil

java.lang.Object

org.apache.hadoop.streaming.StreamUtil

public class StreamUtil
extends Object

Utilities not available elsewhere in Hadoop.

构造器概要

构造器

构造器和说明
StreamUtil()

方法概要

方法

限定符和类型	方法和说明
static String	collate(List args, String sep)
static String	collate(Object[] args, String sep)
static String	dfmt(double d)
static String	findInClasspath(String className)
static String	findInClasspath(String className, ClassLoader loader)
static String	formatBytes(long numBytes)
static String	formatBytes2(long numBytes)
static String	getBoundAntProperty(String name, String defaultVal)
static FileSplit	getCurrentSplit(JobConf job)
static String	getSpace(int len)
static org.apache.hadoop.streaming.StreamUtil.TaskId	getTaskInfo(JobConf job)
static Class	goodClassOrNull(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.
static String	ifmt(double d)
static boolean	isCygwin()
static boolean	isLocalJobTracker(JobConf job)
static String	ljustify(String s, int width)
static String	localizeBin(String path)
static String	makeJavaCommand(Class main, String[] argv)
static String	regexpEscape(String plain)
static String	rjustify(String s, int width)
static String	safeGetCanonicalPath(File f)
static void	touch(File file)

从类继承的方法 java.lang.Object

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

构造器详细资料

StreamUtil

public StreamUtil()

方法详细资料

goodClassOrNull

public static Class goodClassOrNull(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)

返回:

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

dfmt

public static String dfmt(double d)

ifmt

public static String ifmt(double d)

formatBytes

public static String formatBytes(long numBytes)

formatBytes2

public static String formatBytes2(long numBytes)

regexpEscape

public static String regexpEscape(String plain)

safeGetCanonicalPath

public static String safeGetCanonicalPath(File f)

rjustify

public static String rjustify(String s,
              int width)

ljustify

public static String ljustify(String s,
              int width)

getSpace

public static String getSpace(int len)

makeJavaCommand

public static String makeJavaCommand(Class main,
                     String[] argv)

collate

public static String collate(Object[] args,
             String sep)

collate

public static String collate(List args,
             String sep)

getCurrentSplit

public static FileSplit getCurrentSplit(JobConf job)

isLocalJobTracker

public static boolean isLocalJobTracker(JobConf job)

getTaskInfo

public static org.apache.hadoop.streaming.StreamUtil.TaskId getTaskInfo(JobConf job)

touch

public static void touch(File file)
                  throws IOException

抛出:

IOException

isCygwin

public static boolean isCygwin()

localizeBin

public static String localizeBin(String path)

getBoundAntProperty

public static String getBoundAntProperty(String name,
                         String defaultVal)

参数:

name - foo where <junit><sysproperty key="foo" value="${foo}"/> If foo is undefined then Ant sets the unevaluated value. Take this into account when setting defaultVal.