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

    https://github.com/apache/spark/pull/12004#discussion_r113749971
  
    --- Diff: pom.xml ---
    @@ -621,6 +621,11 @@
             <version>${fasterxml.jackson.version}</version>
           </dependency>
           <dependency>
    +        <groupId>com.fasterxml.jackson.dataformat</groupId>
    +        <artifactId>jackson-dataformat-cbor</artifactId>
    --- End diff --
    
    yes, keeping jackson in sync is a key breakage point. Declaring it in the 
root POM doesn't add it everywhere, it just delares it so that the cloud POM 
can exclude the one which comes via  the `aws-java-sdk-s3` dependency JARs and 
pick up the one used in spark. The (later) Spark one is compatible with the one 
aws SDK depends on, so moving up works...it's just that all jackson bits needs 
to be in sync, and there's no way in Maven or Ivy to declare that fact.


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