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courses:mapreduce-tutorial:step-9 [2012/01/26 23:12]
straka 		courses:mapreduce-tutorial:step-9 [2012/01/31 09:42] (current)
straka Change Perl commandline syntax.
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 The Hadoop itself uses many configuration options. The options can be set on command line using the ''-Dname=value'' syntax: The Hadoop itself uses many configuration options. The options can be set on command line using the ''-Dname=value'' syntax:
-  perl script.pl run [-jt cluster_master | -c cluster_size [-w sec_to_wait]] [-r number_of_reducers] [Hadoop options] input_path output_path+  perl script.pl [-jt cluster_master | -c cluster_size [-w sec_to_wait]] [-r number_of_reducers] [-Dname=value -Dname=value ...] input output_path
 Mind that the order of options matters -- the ''-jt'', ''-c'', ''-w'' and ''-r'' must precede Hadoop options to be recognized. Mind that the order of options matters -- the ''-jt'', ''-c'', ''-w'' and ''-r'' must precede Hadoop options to be recognized.
  
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 | ''-r number_of_reducers'' | ''-Dmapred.reduce.tasks=number_of_reducers'' | | ''-r number_of_reducers'' | ''-Dmapred.reduce.tasks=number_of_reducers'' |
  
 +----
 +
 +<html>
 +<table style="width:100%">
 +<tr>
 +<td style="text-align:left; width: 33%; "></html>[[step-8|Step 8]]: Multiple mappers, reducers and partitioning.<html></td>
 +<td style="text-align:center; width: 33%; "></html>[[.|Overview]]<html></td>
 +<td style="text-align:right; width: 33%; "></html>[[step-10|Step 10]]: Combiners.<html></td>
 +</tr>
 +</table>
 +</html>

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