Dmitriy V. Ryaboy commented on PIG-924:

Arun -- it wouldn't suffice for those who want to use pig-0.4 with hadoop 0.19* 
or 0.20*

Pig 0.5 isn't due out for 4 to 6 months which is behind the curve for adoption 
of 20.  Putting in this patch will make compatibility an issue of a 
compile-time flag.  Putting in this patch and restructuring the ant tasks 
somewhat will make this completely transparent.

Waiting until 0.5 means that users wind up with instructions like this: 
http://behemoth.strlen.net/~alex/hadoop20-pig-howto.txt for half a year.

> Make Pig work with multiple versions of Hadoop
> ----------------------------------------------
>                 Key: PIG-924
>                 URL: https://issues.apache.org/jira/browse/PIG-924
>             Project: Pig
>          Issue Type: Bug
>            Reporter: Dmitriy V. Ryaboy
>         Attachments: pig_924.2.patch, pig_924.3.patch, pig_924.patch
> The current Pig build scripts package hadoop and other dependencies into the 
> pig.jar file.
> This means that if users upgrade Hadoop, they also need to upgrade Pig.
> Pig has relatively few dependencies on Hadoop interfaces that changed between 
> 18, 19, and 20.  It is possibly to write a dynamic shim that allows Pig to 
> use the correct calls for any of the above versions of Hadoop. Unfortunately, 
> the building process precludes us from the ability to do this at runtime, and 
> forces an unnecessary Pig rebuild even if dynamic shims are created.

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