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--- courses:mapreduce-tutorial:step-12 [2012/01/25 22:15]
straka
+++ courses:mapreduce-tutorial:step-12 [2012/01/31 09:39] (current)
straka Change Perl commandline syntax.
@@ Line 13: / Line 13: @@
 ===== Reduce-less jobs =====
 If a MR job runs without reducers, the output of mappers is written to output directory without further processing. In this case, environmental variable ''HADOOP_WORK_OUTPUT_PATH'' is present even in a mapper and the files created in this directory are copied to the job output directory.
 ===== Exercise =====
-Change the word counting script {{:courses:mapreduce-tutorial:step-5-solution1.txt|wc.pl}} to produce results in reducers manually using the mentioned environmental variables, and execute it using four reducers.
+Change the word counting script {{:courses:mapreduce-tutorial:step-5-solution1.txt|step-12-exercise.pl}} to produce results in reducers manually using the mentioned environmental variables, and execute it using four reducers.
+  wget --no-check-certificate 'https://wiki.ufal.ms.mff.cuni.cz/_media/courses:mapreduce-tutorial:step-5-solution1.txt' -O 'step-12-exercise.pl'
+  # NOW EDIT THE FILE
+  # $EDITOR step-12-exercise.pl
+  rm -rf step-12-out-ex; perl step-12-exercise.pl -c 4 -r 4 /home/straka/wiki/cs-text-medium/ step-12-out-ex
+  less step-12-out-ex/part-*
+==== Solution ====
+You can also download the solution {{:courses:mapreduce-tutorial:step-12-solution.txt|step-12-solution.pl}} and check the correct output.
+  wget --no-check-certificate 'https://wiki.ufal.ms.mff.cuni.cz/_media/courses:mapreduce-tutorial:step-12-solution.txt' -O 'step-12-solution.pl'
+  # NOW VIEW THE FILE
+  # $EDITOR step-12-solution.pl
+  rm -rf step-12-out-sol; perl step-12-solution.pl -c 4 -r 4 /home/straka/wiki/cs-text-medium/ step-12-out-sol
+  less step-12-out-sol/vystup-*
-{{:courses:mapreduce-tutorial:step-12-solution.txt|Solution.pl}}
+----
+<html>
+<table style="width:100%">
+<tr>
+<td style="text-align:left; width: 33%; "></html>[[step-11|Step 11]]: Initialization and cleanup of MR tasks, performance of combiners.<html></td>
+<td style="text-align:center; width: 33%; "></html>[[.|Overview]]<html></td>
+<td style="text-align:right; width: 33%; "></html>[[step-13|Step 13]]: Sorting.<html></td>
+</tr>
+</table>
+</html>

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