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From "Christopher Olston (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-552) UDF defined with argument causes class instantiation exception
Date Thu, 04 Dec 2008 01:51:44 GMT

    [ https://issues.apache.org/jira/browse/PIG-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12653120#action_12653120
] 

Christopher Olston commented on PIG-552:
----------------------------------------

I am defining an EvalFunc and using it in FOREACH. There is no sorting going on here. 

For some reason Pig tries to check whether it is a CompareFunc, and that check causes an exception
to be thrown because it passes a bogus string to the classloader. 

Seems to me this is a serious bug that needs to be fixed.

> UDF defined with argument causes class instantiation exception
> --------------------------------------------------------------
>
>                 Key: PIG-552
>                 URL: https://issues.apache.org/jira/browse/PIG-552
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Christopher Olston
>         Attachments: pig.patch
>
>
> I'm doing:
> define myFunc myFunc('blah');
> b = foreach a generate myFunc(*);
> Pig parses it, but fails when it tries to run it on hadoop (I'm using "local" mode).
It tries to invoke the class loader on "myFunc('blah')" instead of on "myFunc", which causes
an exception.
> The bug seems to stem from this part of JobControlCompiler.getJobConf():
>                 if(mro.UDFs.size()==1){
>                     String compFuncSpec = mro.UDFs.get(0);
>                     Class comparator = PigContext.resolveClassName(compFuncSpec);
>                     if(ComparisonFunc.class.isAssignableFrom(comparator)) {
>                         jobConf.setMapperClass(PigMapReduce.MapWithComparator.class);
>                         jobConf.setReducerClass(PigMapReduce.ReduceWithComparator.class);
>                         jobConf.set("pig.reduce.package", ObjectSerializer.serialize(pack));
>                         jobConf.set("pig.usercomparator", "true");
>                         jobConf.setOutputKeyClass(NullableTuple.class);
>                         jobConf.setOutputKeyComparatorClass(comparator);
>                     }
>                 } else {
>                     jobConf.set("pig.sortOrder",
>                         ObjectSerializer.serialize(mro.getSortOrder()));
>                 }

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