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courses:mapreduce-tutorial:step-7 [2012/01/31 09:41]
straka Change Perl commandline syntax. 		courses:mapreduce-tutorial:step-7 [2013/02/08 14:36] (current)
popel Milan improved our Hadoop
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 A cluster can be created using A cluster can be created using
-  /net/projects/hadoop/bin/hadoop-cluster -c number_of_machines -w sec_to_run_the_cluster_for+  /net/projects/hadoop/bin/hadoop-cluster -c number_of_machines -w sec_to_wait_after_all_jobs_completed
 The syntax is the same as in ''perl script.pl run''. The syntax is the same as in ''perl script.pl run''.
  
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 Running cluster is identified by its master. When running a Hadoop job using Perl API, existing cluster can be used by Running cluster is identified by its master. When running a Hadoop job using Perl API, existing cluster can be used by
   perl script.pl -jt cluster_master:9001 ...   perl script.pl -jt cluster_master:9001 ...
 +
 +===== Running Hadoop jobs from now on =====
 +
 +From now on, it is best to run MR jobs using a one-machine cluster -- create a one-machine cluster using ''hadoop-cluster'' for 3h (10800s) and run jobs using ''-jt cluster_master''. Running the scripts locally without any cluster has several disadvantages, most notably having only one reducer per job. 
  
 ===== Example ===== ===== Example =====

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