Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/1884#discussion_r16040902
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalSorter.scala ---
@@ -744,13 +744,21 @@ private[spark] class ExternalSorter[K, V, C](
var in: FileInputStream = null
try {
out = new FileOutputStream(outputFile)
+ val outChannel = out.getChannel()
for (i <- 0 until numPartitions) {
- val file = partitionWriters(i).fileSegment().file
- in = new FileInputStream(file)
- org.apache.spark.util.Utils.copyStream(in, out)
--- End diff --
Can we hide this implementation in CopyStream? i.e. if it is
FileOutputStream and FileINputStream, then use transferTo?
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