Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1481#discussion_r15718797
--- Diff:
core/src/main/scala/org/apache/spark/storage/BlockObjectWriter.scala ---
@@ -168,6 +174,7 @@ private[spark] class DiskBlockObjectWriter(
// truncate the file to the last valid position.
objOut.flush()
bs.flush()
+ writeMetrics.map(_.shuffleBytesWritten -= (channel.position() -
lastValidPosition))
--- End diff --
Just as a note, if you don't want the result of this, use `foreach`, not
`map`. `map` will return an Option[Long] in this case but we aren't assigning
it to anything.
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