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From "Dmitriy V. Ryaboy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-924) Make Pig work with multiple versions of Hadoop
Date Tue, 18 Aug 2009 17:40:14 GMT

     [ https://issues.apache.org/jira/browse/PIG-924?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitriy V. Ryaboy updated PIG-924:
----------------------------------

    Attachment: pig_924.2.patch

This patch addresses the reviewer comments.
I put the factor of 0.9 into the 18 shim to restore old behavior (not sure what the motivation
was for changing this for 20.. 

I set the default hadoop version to 18, so that we can verify correctness by running automated
tests.

The existing unit tests are sufficient verification of this patch (at least as far as 18 is
concerned).

> 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.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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