org.apache.hadoop.examples.terasort
Class TeraGenWithCRC

java.lang.Object
  org.apache.hadoop.conf.Configured
      org.apache.hadoop.examples.terasort.TeraGenWithCRC

All Implemented Interfaces:

org.apache.hadoop.conf.Configurable, org.apache.hadoop.util.Tool

public class TeraGenWithCRC
extends org.apache.hadoop.conf.Configured
implements org.apache.hadoop.util.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

Nested Class Summary

static class

TeraGenWithCRC.SortGenMapper The Mapper class that given a row number, will generate the appropriate output line.

Constructor Summary

TeraGenWithCRC()

Method Summary

static void	main(String[] args)
int	run(String[] args)

Methods inherited from class org.apache.hadoop.conf.Configured

getConf, setConf

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.hadoop.conf.Configurable

getConf, setConf

Constructor Detail

TeraGenWithCRC

public TeraGenWithCRC()

Method Detail

run

public int run(String[] args)
        throws IOException

Specified by:

run in interface org.apache.hadoop.util.Tool

Parameters:

args - the cli arguments

Throws:

IOException

main

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

Throws:

Exception