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From "Thejas M Nair (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-894) order-by fails when input is empty
Date Tue, 21 Jul 2009 18:56:15 GMT
order-by fails when input is empty

                 Key: PIG-894
                 URL: https://issues.apache.org/jira/browse/PIG-894
             Project: Pig
          Issue Type: Bug
            Reporter: Thejas M Nair

grunt> l = load 'students.txt' ;
grunt> f = filter l by 1 == 2;
grunt> o = order f by $0 ;
grunt> dump o;

This results in 3 MR jobs . The 2nd (sampling) MR creates empty sample file, and 3rd MR (order-by)
fails with following error in Map job -

java.lang.RuntimeException: java.lang.RuntimeException: Empty samples file
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.WeightedRangePartitioner.configure(WeightedRangePartitioner.java:104)
	at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:58)
	at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:82)
	at org.apache.hadoop.mapred.MapTask$MapOutputBuffer.(MapTask.java:348)
	at org.apache.hadoop.mapred.MapTask.run(MapTask.java:193)
	at org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2207)
Caused by: java.lang.RuntimeException: Empty samples file
	at org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.partitioners.WeightedRangePartitioner.configure(WeightedRangePartitioner.java:89)
	... 5 more

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