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https://issues.apache.org/jira/browse/HADOOP-12281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14658911#comment-14658911
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Colin Patrick McCabe commented on HADOOP-12281:
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Well, you got me. It was a massive troll all along. :)
> Add an incompatible version of Kryo to the hadoop-client classpath
> ------------------------------------------------------------------
>
> Key: HADOOP-12281
> URL: https://issues.apache.org/jira/browse/HADOOP-12281
> Project: Hadoop Common
> Issue Type: New Feature
> Components: build
> Reporter: Steve Loughran
> Assignee: Gunther Hagleitner
>
> Although versions of guava & jackson create compatibility problems, the issue
> of Kryo compatibility is put off until Hive, Spark and other libraries are
> loaded on the same classpath. By adding a version of Kryo to the Hadoop core
> libraries, we can break everything downstream in a consistent manner.
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