Github user squito commented on a diff in the pull request:
https://github.com/apache/spark/pull/8559#discussion_r64227185
--- Diff: core/src/main/scala/org/apache/spark/scheduler/TaskResult.scala
---
@@ -59,7 +59,7 @@ private[spark] class DirectTaskResult[T](
val numUpdates = in.readInt
if (numUpdates == 0) {
- accumUpdates = null
+ accumUpdates = Seq()
--- End diff --
yeah, likewise. I guess in all real spark jobs, the number of accum
updates is > 0, which is why this didn't particularly matter except for these
mocks. OTOH if this has any real danger we should just fix this separately
(and be sure to include it in 2.0)
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