[jira] [Commented] (PIG-2388) Make shim for Hadoop 0.20 and 0.23 support dynamic

["Dmitriy V. Ryaboy (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PIG-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13605849#comment-13605849 ] 

Dmitriy V. Ryaboy commented on PIG-2388:
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Hive does this, and back in the day there was a patch that did this for Pig and hadoop 18 vs hadoop 20.
Should be doable, though it'll take work..
                
> 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: 0.9.2, 0.10.0
>            Reporter: Thomas Weise
>             Fix For: 0.9.2, 0.10.0
>
>         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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