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From "Daniel Dai (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PIG-2388) Make shim for Hadoop 0.20 and 0.23 support dynamic
Date Thu, 01 Dec 2011 20:02:40 GMT

    [ https://issues.apache.org/jira/browse/PIG-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13161092#comment-13161092
] 

Daniel Dai commented on PIG-2388:
---------------------------------

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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