Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16989#discussion_r117175176
--- Diff: core/src/main/scala/org/apache/spark/scheduler/MapStatus.scala ---
@@ -128,41 +133,60 @@ private[spark] class CompressedMapStatus(
* @param numNonEmptyBlocks the number of non-empty blocks
--- End diff --
You should also update the top-level Scaladoc prose description of this
class to discuss the new behavior. The current sentence,
```
* A [[MapStatus]] implementation that only stores the average size of
non-empty blocks,
* plus a bitmap for tracking which blocks are empty.
```,
is inaccurate after your changes.
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