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courses:mapreduce-tutorial:step-25 [2012/01/31 12:45]
straka 		courses:mapreduce-tutorial:step-25 [2012/01/31 13:04]
straka
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 ===== Exercise ===== ===== Exercise =====
 +
 +Implement the [[.:step-13|sorting exercise]] in Java -- only the part with uniform keys.
 +
 +**Remark:** Values of type ''Text'' are sorted lexicographically, but values of type ''IntWritable'' are sorted according to value. Your mapper should therefore produce pairs of types (''IntWritable'', ''Text'').
 +
 +You can download the {{:courses:mapreduce-tutorial:step-25.txt|Sorting.java}} template and execute it.
 +
 +  wget --no-check-certificate 'https://wiki.ufal.ms.mff.cuni.cz/_media/courses:mapreduce-tutorial:step-25.txt' -O 'Sorting.java'
 +  # NOW VIEW THE FILE
 +  # $EDITOR Sorting.java
 +  make -f /net/projects/hadoop/java/Makefile Sorting.jar
 +  rm -rf step-25-out-sol; /net/projects/hadoop/bin/hadoop Sorting.jar -r 0 /home/straka/wiki/cs-text-small step-25-out-sol
 +  less step-25-out-sol/part-*
  
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