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

    https://github.com/apache/spark/pull/15915#discussion_r92123402
  
    --- Diff: 
core/src/main/scala/org/apache/spark/util/io/ChunkedByteBufferOutputStream.scala
 ---
    @@ -30,9 +31,14 @@ import org.apache.spark.storage.StorageUtils
      * @param chunkSize size of each chunk, in bytes.
      */
     private[spark] class ChunkedByteBufferOutputStream(
    -    chunkSize: Int,
    +    var chunkSize: Int,
         allocator: Int => ByteBuffer)
    -  extends OutputStream {
    +  extends OutputStream with Logging{
    +
    +  if (chunkSize < 0) {
    +    logWarning(s"chunkSize should not be an negative value, replaced as 
4MB default.")
    +    chunkSize = 4 * 1024 * 1024
    +  }
     
    --- End diff --
    
    This doesn't fix the issue, because a value > Int.MaxValue can still 
truncate to a (wrong) positive Int.
    
    If protecting against Long values > Int.MaxValue is the least we can do to 
address this problem, we should actually do that. It can't be that many call 
sites right?


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