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From "Vivek Padmanabhan (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2404) NullPointerException when I have multiple python udfs
Date Fri, 09 Dec 2011 11:00:40 GMT

    [ https://issues.apache.org/jira/browse/PIG-2404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13166060#comment-13166060
] 

Vivek Padmanabhan commented on PIG-2404:
----------------------------------------

I get an error when I have functions with same name but different args in different python
scripts.
I am not sure whether this is some invalid construct or again some mistake from my part. Please
help me out.

Script
----------------------------------------------------------------------------------
register 'a.py' using org.apache.pig.scripting.jython.JythonScriptEngine as a_func;
register 'b.py' using org.apache.pig.scripting.jython.JythonScriptEngine as b_func;

A = load 'i1' as (f1:chararray, f2:chararray, f3:chararray);
B =  foreach A generate a_func.helloworld(), a_func.area(3,4), b_func.area(3);
dump B;
----------------------------------------------------------------------------------
a.py 
@outputSchema("word:chararray")
def helloworld():  
  return 'Hello, World'

@outputSchema("cube:long")
def area(num,x):
  return ((num)*(num)*(num)*(x))
----------------------------------------------------------------------------------
 b.py 
@outputSchema("square:long")
def area(num2):
  return ((num2)*(num2))
----------------------------------------------------------------------------------

Error Message;

ERROR org.apache.pig.Main - ERROR 2997: Encountered IOException. Embedded script cannot mix
UDFs with top level code. Please use if __name__ == '__main__': construct

                
> NullPointerException when I have multiple python udfs
> -----------------------------------------------------
>
>                 Key: PIG-2404
>                 URL: https://issues.apache.org/jira/browse/PIG-2404
>             Project: Pig
>          Issue Type: Improvement
>    Affects Versions: 0.8.1, 0.9.1
>            Reporter: Vivek Padmanabhan
>            Assignee: xuting zhao
>            Priority: Trivial
>             Fix For: 0.9.2
>
>
> When I have multiple python udfs registered, the script fails at compile phase while
trying to get the udf ouputschema.
> {code}
> register 'a.py' using org.apache.pig.scripting.jython.JythonScriptEngine as a_func;
> register 'b.py' using org.apache.pig.scripting.jython.JythonScriptEngine as b_func;
> a = load 'i1' as (f1:chararray);
> b = foreach a generate a_func.helloworld(), b_func.square(3);
> dump b;
> {code}
> a.py 
> {code}
> @outputSchema("word:chararray")
> def helloworld():  
>   return 'Hello, World'
> {code}
> b.py 
> {code}
> @outputSchemaFunction("squareSchema")
> def square(num):
>   return ((num)*(num))
> {code}
> Moreover , in the log we can see duplicate and incorrect registration of udfs which I
believe the cause for the script failure.
> INFO  org.apache.pig.scripting.jython.JythonScriptEngine - Register scripting UDF: a_func.helloworld
> INFO  org.apache.pig.scripting.jython.JythonScriptEngine - Register scripting UDF: b_func.square
> INFO  org.apache.pig.scripting.jython.JythonScriptEngine - Register scripting UDF: b_func.helloworld
> This issue is observed in 0.9,0.8 and  in trunk also.

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