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From "Christopher Olston (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-552) UDF defined with argument causes class instantiation exception, when UDF followed by sort
Date Tue, 02 Dec 2008 00:51:44 GMT

     [ https://issues.apache.org/jira/browse/PIG-552?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christopher Olston updated PIG-552:
-----------------------------------

    Description: 
I'm doing:

define myFunc myFunc('blah');
b = foreach a generate myFunc(*);
c = order b by $0;

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()));
                }


  was:
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()));
                }


        Summary: UDF defined with argument causes class instantiation exception, when UDF
followed by sort  (was: UDF defined with argument causes class instantiation exception)

> UDF defined with argument causes class instantiation exception, when UDF followed by
sort
> -----------------------------------------------------------------------------------------
>
>                 Key: PIG-552
>                 URL: https://issues.apache.org/jira/browse/PIG-552
>             Project: Pig
>          Issue Type: Bug
>    Affects Versions: types_branch
>            Reporter: Christopher Olston
>
> I'm doing:
> define myFunc myFunc('blah');
> b = foreach a generate myFunc(*);
> c = order b by $0;
> 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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