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https://issues.apache.org/jira/browse/PIG-1534?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12895742#action_12895742
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Daniel Dai commented on PIG-1534:
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+1. Verified that also solve skewed join case.
> Code discovering UDFs in the script has a bug in a order by case
> ----------------------------------------------------------------
>
> Key: PIG-1534
> URL: https://issues.apache.org/jira/browse/PIG-1534
> Project: Pig
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Pradeep Kamath
> Assignee: Pradeep Kamath
> Fix For: 0.8.0
>
> Attachments: PIG-1534.patch
>
>
> Consider the following commandline:
> {noformat}
> java -cp /tmp/svncheckout/pig.jar:udf.jar:clusterdir org.apache.pig.Main -e
> "a = load 'studenttab' using udf.MyPigStorage(); b = order a by $0; dump b;"
> {noformat}
> Notice there is no "register udf.jar", instead udf.jar (which contains
> udf.MyPigStorage) is in the classpath. Pig handles this case by shipping
> udf.jar to the backend. However the above script with order by triggers the
> bug with the following error message:
> ERROR 2997: Unable to recreate exception from backed error:
> java.lang.RuntimeException: could not instantiate
> 'org.apache.pig.impl.builtin.RandomSampleLoader' with arguments
> '[udf.MyPigStorage, 100]'
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