Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/21440#discussion_r203235292
--- Diff:
core/src/main/scala/org/apache/spark/util/io/ChunkedByteBuffer.scala ---
@@ -17,17 +17,21 @@
package org.apache.spark.util.io
-import java.io.InputStream
+import java.io.{File, FileInputStream, InputStream}
import java.nio.ByteBuffer
-import java.nio.channels.WritableByteChannel
+import java.nio.channels.{FileChannel, WritableByteChannel}
+
+import scala.collection.mutable.ListBuffer
import com.google.common.primitives.UnsignedBytes
-import io.netty.buffer.{ByteBuf, Unpooled}
import org.apache.spark.SparkEnv
import org.apache.spark.internal.config
+import org.apache.spark.network.buffer.{FileSegmentManagedBuffer,
ManagedBuffer}
import org.apache.spark.network.util.ByteArrayWritableChannel
import org.apache.spark.storage.StorageUtils
+import org.apache.spark.util.Utils
+
--- End diff --
nit. This blank line seems not necessary.
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