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https://issues.apache.org/jira/browse/PIG-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161092#comment-13161092
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Daniel Dai commented on PIG-2388:
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Thanks Thomas, you dig much deep than I do, I cannot even make it compile. Now
we need to compile both pig-23.jar and pig-20.jar, and pick the right version
in pig script.
> Make shim for Hadoop 0.20 and 0.23 support dynamic
> --------------------------------------------------
>
> Key: PIG-2388
> URL: https://issues.apache.org/jira/browse/PIG-2388
> Project: Pig
> Issue Type: Improvement
> Affects Versions: 0.10, 0.9.2
> Reporter: Thomas Weise
> Assignee: Thomas Weise
> Fix For: 0.10, 0.9.2
>
> Attachments: PIG-2388_branch-0.9.patch
>
>
> We need a single Pig installation that works with both Hadoop versions. The
> current shim implementation assumes different builds for each version. We can
> solve this statically through internal build/installation system or by making
> the shim dynamic so that pig.jar will work on both version with runtime
> detection. Attached patch is to convert the static shims into a shim
> interface with 2 implementations, each of which will be compiled against the
> respective Hadoop version and included into single pig.jar (similar to what
> Hive does).
> The default build behavior remains unchanged, only the shim for
> ${hadoopversion} will be compiled. Both shims can be built via: ant
> -Dbuild-all-shims=true
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