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courses:mapreduce-tutorial:step-4 [2012/01/24 21:24]
straka 		courses:mapreduce-tutorial:step-4 [2012/01/24 21:28]
straka
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 ====== MapReduce Tutorial : Counters ====== ====== MapReduce Tutorial : Counters ======
  
-Sometimes it is useful to +Sometimes it is useful to count events differently than outputting them (key, value) pairs. For that reason Hadoop offers simple counter framework. 
 + 
 +<code perl> 
 +... 
 +sub map() { 
 + 
 +} 
 +... 
 +</code>
  
 ===== Exercise ===== ===== Exercise =====
Line 8: Line 16:
  
 {{.:step-4-solution.txt|Solution.pl}} {{.:step-4-solution.txt|Solution.pl}}
 +

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