try adding the full path to the jar via PIG_CLASSPATH like so: export PIG_CLASSPATH=/path/to/jython.jar
then run pig. Also, I assume your doing your testing on a local machine? if it's on a cluster, you need to make sure jython is on all the worker nodes and classpath is setup properly on all of them as well. On Wed, Dec 29, 2010 at 9:57 AM, Jonathan Coveney <[email protected]>wrote: > I do have Jython installed and on PATH, but maybe I didn't include it in > the > right way? Where does it need to be? > > 2010/12/29 [email protected] <[email protected]> > > > Do you have Jython on your classpath? Currently Jython isn't distributed > in > > the 0.8.0 release tarball. > > > > On Mon, Dec 27, 2010 at 7:18 PM, Jonathan Coveney <[email protected] > > >wrote: > > > > > Oh and just to be sure, I have tried > > > @outputSchema("word:chararray") > > > @outputSchema("x:{t:(word:chararray)}") > > > as well (the former of which seems to be the "right" one, whenever I > can > > > figure out what is wrong) > > > > > > I've tested my code separately in python and it is fine... > > > > > > 2010/12/28 Jonathan Coveney <[email protected]> > > > > > > > Aniket, I appreciate you taking a look at this. In general, I found > the > > > > documentation around outputSchema pretty confusing... for example, in > > > this > > > > example > > > > > > > > @outputSchema("x:{t:(word:chararray)}") > > > > def helloworld(): > > > > return ('Hello, World') > > > > > > > > > > > > Then, in the sample script below that, you have > > > > > > > > @outputSchema("t:(numformat:chararray)") > > > > def commaFormat(num): > > > > return '{:,}'.format(num) > > > > > > > > In this case, you have lost the x:{} (which makes more sense to me. > > > > > > > > Perhaps this is because the latter function is meant to operate on an > > > input > > > > and return a type (t), whereas the hello world function should be > able > > to > > > > stand alone, and thus, has to return a bag? Not sure... > > > > > > > > Besides that, though, I changed my code per your suggestion and tried > > > > > > > > @outputSchema("t:(word:chararray)") > > > > > > > > and still got the error. > > > > > > > > As a note, do I need to import anything in the python script for > > > > outputSchema to work, or should it be fine since pig is grabbing it? > > > > > > > > Once again, I really appreciate your help in the matter. I feel > having > > > > people who weren't intimately related to the project have a go at it > is > > > how > > > > you make it ultimately more usable and useful...but you have to > answer > > > some > > > > annoying questions on the way :P > > > > > > > > Thanks again. > > > > > > > > 2010/12/28 Aniket Mokashi <[email protected]> > > > > > > > > I think decorator used here is incorrect. > > > >> In general, "output:chararray" needs to be schema-string-compatible. > > > Also, > > > >> you are using "outputSchemaFunction", which is used in case you want > > to > > > >> write a udf that has output schema dependent on input schema (ęg > > > -square) > > > >> and this should have a function with decorator "schemaFunction" > (named > > > >> "output" in your case). I think using "outputSchema" decorator would > > fix > > > >> the problem here. > > > >> > > > >> More details can be found at- > > > >> http://wiki.apache.org/pig/UDFsUsingScriptingLanguages > > > >> > > > >> Thanks, > > > >> Aniket > > > >> > > > >> On Mon, December 27, 2010 4:30 pm, Jonathan Coveney wrote: > > > >> > so I have module.py, and I want to be able to use it in a pig > > script. > > > It > > > >> > has no special imports or anything. I do have > > > >> > @outputSchemaFunction("output:chararray) > > > >> > > > > >> > > > > >> > In my pig script, I have this > > > >> > > > > >> > > > > >> > register '/my/udf/location/udf.py' using jython as myfunc; > > > >> > > > > >> > is there any reason why this wouldn't work? here is the error I > get: > > > >> > > > > >> > 2010-12-27 16:29:41,288 [main] ERROR > > org.apache.pig.tools.grunt.Grunt > > > - > > > >> > ERROR 2998: Unhandled internal error. > > > org/python/util/PythonInterpreter > > > >> > > > > >> > > > > >> > Not the most instructive error, but is there anything more I need > to > > > be > > > >> > doing to be able to use a python UDF? > > > >> > > > > >> > As an aside, are simply python UDF's as efficient as Java ones? I > > like > > > >> > Python a lot and love the idea of being able to UDF in it, but can > > use > > > >> > java if necessary. > > > >> > > > > >> > > > >> > > > >> > > > > > > > > > > > > > > > -- > > http://about.me/soren/bio > > > -- http://about.me/soren/bio
