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

    https://github.com/apache/spark/pull/6423#discussion_r32074154
  
    --- Diff: 
core/src/main/scala/org/apache/spark/storage/ShuffleBlockFetcherIterator.scala 
---
    @@ -17,23 +17,23 @@
     
     package org.apache.spark.storage
     
    +import java.io.InputStream
     import java.util.concurrent.LinkedBlockingQueue
     
     import scala.collection.mutable.{ArrayBuffer, HashSet, Queue}
     import scala.util.{Failure, Try}
     
    -import org.apache.spark.{Logging, TaskContext}
    -import org.apache.spark.network.shuffle.{BlockFetchingListener, 
ShuffleClient}
     import org.apache.spark.network.buffer.ManagedBuffer
    -import org.apache.spark.serializer.{SerializerInstance, Serializer}
    -import org.apache.spark.util.{CompletionIterator, Utils}
    +import org.apache.spark.network.shuffle.{BlockFetchingListener, 
ShuffleClient}
    +import org.apache.spark.util.Utils
    +import org.apache.spark.{Logging, TaskContext}
    --- End diff --
    
    I'll manually update this. 
    
    Btw, Intellij is sorting this lexicographically with `{` at the bottom 
since the [UTF-8](http://en.wikipedia.org/wiki/UTF-8) code is 123, greater than 
any alphabetical or numerical characters. There's no configuration option in 
Intellij to have it skip certain characters when sorting so we might put a note 
in the style guide that developers need to manually sort imports.


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