Github user RussellSpitzer commented on a diff in the pull request:

    https://github.com/apache/spark/pull/11796#discussion_r73781398
  
    --- Diff: assembly/pom.xml ---
    @@ -69,6 +68,17 @@
           <artifactId>spark-repl_${scala.binary.version}</artifactId>
           <version>${project.version}</version>
         </dependency>
    +
    +    <!--
    +      Because we don't shade dependencies anymore, we need to restore 
Guava to compile scope so
    +      that the libraries Spark depend on have it available. We'll package 
the version that Spark
    +      uses (14.0.1) which is not the same as Hadoop dependencies, but 
works.
    +    -->
    +    <dependency>
    --- End diff --
    
    This is a problem for the Spark Cassandra Connector. The Cassandra Java 
Driver requires a 16.0 or greater version of guava. This necessarily means we 
need to shade now. This was on our roadmap anyway just wanted you to be aware.


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