order-by fails when input is empty
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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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