## org.apache.hadoop.examples.terasort
Class TeraGen

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

All Implemented Interfaces:
  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

Nested Class Summary
`static class` `TeraGen.SortGenMapper` The Mapper class that given a row number, will generate the appropriate output line.

Constructor Summary
`TeraGen()`

Method Summary
`static void` `main(String[] args)`
`int` `run(String[] args)` Execute the command with the given arguments.

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

### TeraGen

    public TeraGen()

Method Detail

### run

    public int run(String[] args)
            throws IOException

  Description copied from interface: `Tool`
  Execute the command with the given arguments.

  Specified by:
    `run` in interface `Tool`
  Parameters:
    `args` - the cli arguments
  Returns:
    exit code.
  Throws:
    `IOException`

### main

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

  Throws:
    `Exception`

Copyright © 2009 The Apache Software Foundation