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

    https://github.com/apache/spark/pull/21175#discussion_r184644678
  
    --- Diff: 
core/src/test/scala/org/apache/spark/io/ChunkedByteBufferSuite.scala ---
    @@ -56,6 +56,13 @@ class ChunkedByteBufferSuite extends SparkFunSuite {
         assert(chunkedByteBuffer.getChunks().head.position() === 0)
       }
     
    +  test("SPARK-24107: writeFully() write buffer which is larger than 
bufferWriteChunkSize") {
    +    val chunkedByteBuffer = new 
ChunkedByteBuffer(Array(ByteBuffer.allocate(80 * 1024 * 1024)))
    --- End diff --
    
    Can you configure `bufferWriteChunkSize` explicitly?


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