Github user 10110346 commented on the issue:
https://github.com/apache/spark/pull/23216
>
>
> Are you sure it's even a field in the class? it looks like it's only used
to define this:
>
> ```
> @transient private[this] val preferredLocs: Seq[TaskLocation] = {
> if (locs == null) Nil else locs.toSet.toSeq
> }
> ```
>
> I'd expect Scala would not generate a field. Indeed the thing it is used
to make is transient.
Yeah, it would not generate a field, thanks @srowen
By the way, is it better to remove `transient` for `ShuffleMapTask`?
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