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https://issues.apache.org/jira/browse/HADOOP-12281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14658559#comment-14658559
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Steve Loughran commented on HADOOP-12281:
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By adding a version of kryo to the base classpath we can know from the outset
that everything which uses kryo won't work, rather than waiting for this to
show up at integration test time.
> 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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