Dmitriy,
I have also tried that pattern for a Loader and it doesn't find the String
constructor, it only works with the void constructor.
grunt> define myreader com.sabre.pigshop.ShoppingReader('all');
grunt> A = LOAD '/user/alanw/*.xml' USING myreader() AS (x);
2012-04-09 07:33:58,502 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
2999: Unexpected internal error. could not instantiate
'com.sabre.pigshop.ShoppingReader' with arguments '[all]'
This works:
grunt> define myreader com.sabre.pigshop.ShoppingReader();
grunt> A = LOAD '/user/alanw/*.xml' USING myreader AS (x);
I haven't dug into the Pig source yet, perhaps the Loader functions are treated
differently than another UDF? Seems unlikely.
Thanks,
Alan
-----Original Message-----
From: Dmitriy Ryaboy [mailto:[email protected]]
Sent: Friday, April 06, 2012 6:21 PM
To: [email protected]; Walker, Alan
Subject: Re: Sending parameters to a customer load function
Hi Alan,
You can use "define" to supply an argument to a UDF constructor.
You can see an example here:
http://ofps.oreilly.com/titles/9781449302641/intro_pig_latin.html#udf_define
I did just find to my surprise that this isn't in our documentation..
we should add that.
D
On Fri, Apr 6, 2012 at 1:38 PM, Walker, Alan <[email protected]> wrote:
> Hi,
>
> I'm having some challenges with a load function. It only seems to work with
> a void constructor. The Java code has a void constructor and a String
> constructor, much like the SimpleTextLoader example. Any thoughts on what
> might be going wrong?
>
> public ShoppingReader() {
> parms = "";
> }
>
> public ShoppingReader(String tmp) {
> parms = tmp;
> }
>
> grunt> A = LOAD '/user/alanw/*.xml' USING
> com.sabre.pigshop.ShoppingReader('all') AS (x);
> 2012-04-06 16:04:08,593 [main] ERROR org.apache.pig.tools.grunt.Grunt - ERROR
> 2999: Unexpected internal error. could not instantiate
> com.sabre.pigshop.ShoppingReader' with arguments '[all]'
>
> Thanks,
> Alan.
>
