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https://issues.apache.org/jira/browse/PIG-924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12745513#action_12745513
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Daniel Dai commented on PIG-924:
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Wrapping hadoop functionality add extra maintenance cost to adopting new
features of hadoop. We still need to figure out the balance point between
usability and maintenance cost. I don't think this issue is a blocker for 0.4.
> 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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