package My::Mapper;
use Moose;
with 'Hadoop::Mapper';

sub map {
  my ($self, $key, $value, $context) = @_;

  $context->write($key, $value);
}

package My::Reducer;
use Moose;
with 'Hadoop::Reducer';

sub reduce {
  my ($self, $key, $values, $context) = @_;

  while ($values->next) {
    $context->write($key, $values->value);
  }
}

package main;
use Hadoop::Runner;

my $runner = Hadoop::Runner->new(
  mapper => My::Mapper->new(),
  reducer => My::Reducer->new());

$runner->run();