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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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