org.apache.hadoop.examples.terasort

类 TeraGen

java.lang.Object

org.apache.hadoop.conf.Configured

org.apache.hadoop.examples.terasort.TeraGen

所有已实现的接口:

Configurable, Tool

public class TeraGen
extends Configured
implements Tool

Generate the official terasort input data set. The user specifies the number of rows and the output directory and this class runs a map/reduce program to generate the data. The format of the data is:

• (10 bytes key) (10 bytes rowid) (78 bytes filler) \r \n
• The keys are random characters from the set ' ' .. '~'.
• The rowid is the right justified row id as a int.
• The filler consists of 7 runs of 10 characters from 'A' to 'Z'.

To run the program: bin/hadoop jar hadoop-examples-*.jar teragen 10000000000 in-dir

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	TeraGen.SortGenMapper The Mapper class that given a row number, will generate the appropriate output line.

构造器概要

构造器

构造器和说明
TeraGen()

方法概要

方法

限定符和类型	方法和说明
static void	main(String[] args)
int	run(String[] args) Execute the command with the given arguments.

从类继承的方法 org.apache.hadoop.conf.Configured

getConf, setConf

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.hadoop.conf.Configurable

getConf, setConf

构造器详细资料

TeraGen

public TeraGen()

方法详细资料

run

public int run(String[] args)
        throws IOException

从接口复制的说明: Tool

Execute the command with the given arguments.

指定者:

run 在接口中 Tool

参数:

args - the cli arguments

返回:

exit code.

抛出:

IOException

main

public static void main(String[] args)
                 throws Exception

抛出:

Exception