Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18730#discussion_r135027030
--- Diff:
core/src/main/scala/org/apache/spark/util/io/ChunkedByteBuffer.scala ---
@@ -40,6 +40,8 @@ private[spark] class ChunkedByteBuffer(var chunks:
Array[ByteBuffer]) {
require(chunks != null, "chunks must not be null")
require(chunks.forall(_.position() == 0), "chunks' positions must be 0")
+ private val NIO_BUFFER_LIMIT = 64 * 1024 * 1024 // Chunk size in bytes
--- End diff --
shall we make it configurable? we can add a new entry in
`org.apache.spark.internal.config`, and mark it as an internal config first.
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