Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/16387#discussion_r95044381
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala
---
@@ -115,6 +115,7 @@ class ExternalAppendOnlyMap[K, V, C](
private val keyComparator = new HashComparator[K]
private val ser = serializer.newInstance()
+ @volatile private var isReadingIterator: Boolean = false
--- End diff --
I'm a little confused. Isn't this having the same effect as just removing
the assert, since you're setting this to `true` right after instantiating
`readingIterator`?
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