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https://issues.apache.org/jira/browse/SPARK-19464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15853212#comment-15853212
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Apache Spark commented on SPARK-19464:
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User 'srowen' has created a pull request for this issue:
https://github.com/apache/spark/pull/16810
> Remove support for Hadoop 2.5 and earlier
> -----------------------------------------
>
> Key: SPARK-19464
> URL: https://issues.apache.org/jira/browse/SPARK-19464
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core, YARN
> Affects Versions: 2.1.0
> Reporter: Sean Owen
> Assignee: Sean Owen
>
> As discussed last year, and again on the mailing list this week, it's likely
> time to remove support for Hadoop 2.5 and earlier. Distros have been on 2.6
> for over 2 years, and upstream is on to 2.7 / 3.x. It only affects Hadoop
> cluster users. 2.1.x continues to work on 2.2+.
> The benefit is mostly cleaning up the build matrix, reasoning about
> dependencies across Hadoop versions, and bits of code across the project that
> depend on reflection to deal with newer features. It makes it a little easier
> to use newer Hadoop APIs. De facto, I doubt that versions before 2.6 would be
> given serious support in the project already anyway.
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