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courses:mapreduce-tutorial:step-3 [2012/01/29 23:43]
majlis 		courses:mapreduce-tutorial:step-3 [2012/01/30 13:51]
straka
Line 8: Line 8:
  
 <file perl> <file perl>
-package Mapper;+package My::Mapper;
 use Moose; use Moose;
 with 'Hadoop::Mapper'; with 'Hadoop::Mapper';
Line 18: Line 18:
 } }
  
-package Main;+package main;
 use Hadoop::Runner; use Hadoop::Runner;
  
 my $runner = Hadoop::Runner->new( my $runner = Hadoop::Runner->new(
-  mapper => Mapper->new(),+  mapper => My::Mapper->new(),
   input_format => 'TextInputFormat',   input_format => 'TextInputFormat',
   output_format => 'TextOutputFormat',   output_format => 'TextOutputFormat',
Line 36: Line 36:
 All files in input_directory are processes. The output_directory must not exist. All files in input_directory are processes. The output_directory must not exist.
  
 +=== Standard input and output ===
 +Standard input and standard output of the Perl script are used to communicate with the Hadoop framework. Therefore you should use standard error output if you want to print some debugging output using ''print STDERR "Message"''.
  
 ===== Exercise ===== ===== Exercise =====

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