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https://issues.apache.org/jira/browse/PIG-894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12763776#action_12763776
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Pradeep Kamath commented on PIG-894:
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The patch uses pig.inputs property from jobconf which does not directly have
the input file name - it actually has a serialized arrayList<Pair<FileSpec,
Boolean>> in string form containing the filespec and the issplittable flag for
each input for the job - this serialized string will need to be deserialized
using ObjectSerializer.deserialize and then from the filespec, the filename
will need to be retrieved.
> 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
> Assignee: Daniel Dai
> Attachments: PIG-894-1.patch
>
>
> 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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