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https://issues.apache.org/jira/browse/HIVE-3607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13481950#comment-13481950
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Kevin Wilfong commented on HIVE-3607:
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Naturally this will require testing beyond the standard ant test before
deploying, but I wanted to see if anyone had any other objections to this.
> Set mapreduce.task.classpath.user.precedence to true by default
> ---------------------------------------------------------------
>
> Key: HIVE-3607
> URL: https://issues.apache.org/jira/browse/HIVE-3607
> Project: Hive
> Issue Type: Improvement
> Components: Configuration
> Affects Versions: 0.10.0
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
>
> When queries are actually run in a Hadoop cluster, Hive's jars are appended
> to Hadoop's classpath. However, when we test/run jobs locally Hive's
> classpath comes first. This leads to issues like the one brought up here
> after the patch was committed HIVE-3581 where a change depended on a jar Hive
> includes which conflicted with one provided by Hadoop which is an older
> version in 0.20
> It's possible that more of the jars we include are getting preceded by older
> jars in Hadoop, and we haven't noticed yet.
> If we add Hive jars to the beginning of Hadoop's classpath we will be in
> control in such situations where the jars are backwards compatible. We will
> be able to update the jars in Hive and these will be used at run time,
> instead of just compile time.
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