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https://issues.apache.org/jira/browse/PIG-454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich reassigned PIG-454:
----------------------------------
Assignee: Alan Gates
> group by followed by group ALL causes error in reduce
> -----------------------------------------------------
>
> Key: PIG-454
> URL: https://issues.apache.org/jira/browse/PIG-454
> Project: Pig
> Issue Type: Bug
> Affects Versions: types_branch
> Reporter: Pradeep Kamath
> Assignee: Alan Gates
> Fix For: types_branch
>
>
> Script:
> {code}
> a = load 'st10k' as (name, age, gpa);
> b = group a by name;
> c = foreach b generate flatten(group), COUNT(a) as cnt;
> d = group c all;
> e = foreach d generate AVG(c.cnt);
> dump e;
> {code}
> Error:
> {noformat}
> 2008-09-23 17:58:12,002 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.MapReduceLauncher
> - Job failed!
> 2008-09-23 17:58:12,004 [main] ERROR
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.Launcher - Error
> message from task (map) tip_200809051428_0117_m_000000java.io.IOException:
> wrong key class: org.apache.pig.impl.io.NullableTuple is not class
> org.apache.pig.impl.io.NullableText
> at
> org.apache.hadoop.io.SequenceFile$Writer.append(SequenceFile.java:995)
> at
> org.apache.hadoop.mapred.MapTask$CombineOutputCollector.collect(MapTask.java:1079)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:155)
> at
> org.apache.pig.backend.hadoop.executionengine.mapReduceLayer.PigCombiner$Combine.reduce(PigCombiner.java:56)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.combineAndSpill(MapTask.java:872)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.sortAndSpill(MapTask.java:779)
> at
> org.apache.hadoop.mapred.MapTask$MapOutputBuffer.flush(MapTask.java:691)
> at org.apache.hadoop.mapred.MapTask.run(MapTask.java:220)
> at
> org.apache.hadoop.mapred.TaskTracker$Child.main(TaskTracker.java:2124)
> ...
> {noformat}
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