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https://issues.apache.org/jira/browse/PIG-894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12754883#action_12754883
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Ankur commented on PIG-894:
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Is empty inputs referring to relation - l ('students.txt') or f (filter l by 1
== 2). I am seeing a similar issue where the sampler produces an empty file
when the number of records in the relation being sorted in too low ( < 4 ).
> 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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