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https://issues.apache.org/jira/browse/SPARK-12766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-12766.
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    Resolution: Not A Problem

This is on purpose. Some Guava classes are used in the public Java API 
(unfortunately). This was rectified for Spark 2.x but you will find 
{{Optional}} and some dependent classes unshaded in 1.x.

> Unshaded google guava classes in spark-network-common jar
> ---------------------------------------------------------
>
>                 Key: SPARK-12766
>                 URL: https://issues.apache.org/jira/browse/SPARK-12766
>             Project: Spark
>          Issue Type: Bug
>          Components: Build
>    Affects Versions: 1.5.1
>            Reporter: Jake Yoon
>            Priority: Minor
>              Labels: build, sbt
>
> I found an unshaded google guava classes used internally in 
> spark-network-common while working with ElasticSearch.
> Following link discusses about duplicate dependencies conflict cause by guava 
> classes and how I solved the build conflict issue.
> https://discuss.elastic.co/t/exception-when-using-elasticsearch-spark-and-elasticsearch-core-together/38471/4



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