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https://issues.apache.org/jira/browse/PIG-924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745536#action_12745536
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Arun C Murthy commented on PIG-924:
-----------------------------------

bq. The fact is, though, that there are a significant number of people running 
0.18.x who would like to use Pig 0.4.0, and supporting them out of the box 
seems worth it. Given that the API is still changing for 0.21, and Pig hasn't 
adopted the "new" MR APIs yet, it seems like it's premature to leave 18 in the 
cold.

I believe the plan is for 0.4.0 to work with hadoop-0.18.* anyway... wouldn't 
that suffice?

> 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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