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

    https://github.com/apache/spark/pull/21346#discussion_r191964329
  
    --- Diff: project/MimaExcludes.scala ---
    @@ -36,6 +36,9 @@ object MimaExcludes {
     
       // Exclude rules for 2.4.x
       lazy val v24excludes = v23excludes ++ Seq(
    +    // [SPARK-6237][NETWORK] Network-layer changes to allow stream upload
    +    
ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.spark.network.netty.NettyBlockRpcServer.receive"),
    --- End diff --
    
    I suspect that it's because we might want to access these across Java 
package boundaries and Java doesn't have the equivalent of Scala's nested 
package scoped `private[package]`.


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