I try to follow the example on http://pig.apache.org/docs/r0.8.1/udf.html#Python+UDFs for Python UDF, but I got the following error

* My command:
pig -x local ptest.pig

* error message
2011-10-06 15:15:19,995 [main] INFO  org.apache.pig.Main - Logging error messages to: /home/dli/pigExamples/PythonUDFs/pig_1317939319904.log
2011-10-06 15:15:20,485 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: file:///
2011-10-06 15:15:20,956 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2998: Unhandled internal error. org/python/util/PythonInterpreter
Details at logfile: /home/dli/pigExamples/PythonUDFs/pig_1317939319904.log

* My pig code
Register 'test.py' using jython as myfuncs;

a = load 'a.dat' as (v:chararray);
b = foreach a generate v, myfuncs.helloworld();
dump b;

* test.py
@outputSchema("word:chararray")
def helloworld():
   return 'Hello, World'

I wonder what's the problem. My pig version is
pig --version
Apache Pig version 0.8.0-SNAPSHOT (r1085617)

Thanks.
Dan

Hi Danfeng,

I hit this when using an old version of Jython; ensure your Jython version
is 2.5 or newer. In particular, Debian ships with 2.2.1.

-Clay

On Thu, 6 Oct 2011, Danfeng Li wrote:

> I try to follow the example on http://pig.apache.org/docs/r0.8.1/udf.html#Python+UDFs for Python UDF, but I got the following error
>
> * My command:
> pig -x local ptest.pig
>
> * error message
> 2011-10-06 15:15:19,995 [main] INFO  org.apache.pig.Main - Logging error messages to: /home/dli/pigExamples/PythonUDFs/pig_1317939319904.log
> 2011-10-06 15:15:20,485 [main] INFO  org.apache.pig.backend.hadoop.executionengine.HExecutionEngine - Connecting to hadoop file system at: file:///
> 2011-10-06 15:15:20,956 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR 2998: Unhandled internal error. org/python/util/PythonInterpreter
> Details at logfile: /home/dli/pigExamples/PythonUDFs/pig_1317939319904.log
>
> * My pig code
> Register 'test.py' using jython as myfuncs;
>
> a = load 'a.dat' as (v:chararray);
> b = foreach a generate v, myfuncs.helloworld();
> dump b;
>
> * test.py
> @outputSchema("word:chararray")
> def helloworld():
>   return 'Hello, World'
>
> I wonder what's the problem. My pig version is
> pig --version
> Apache Pig version 0.8.0-SNAPSHOT (r1085617)
>
> Thanks.
> Dan
>