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 -- This message is automatically generated by JIRA. - You can reply to this email to add a comment to the issue online.