Github user seyfe commented on the issue:
https://github.com/apache/spark/pull/15371
@zsxwing. `BlockStatusesAccumulator` is using synchronizedList which is
`_seq` for concurrency. But when the `value` method is executed and the output
is used by `asScala.toList` it caused the `ConcurrentModificationException`.
`Collections.synchronizedList` suggests using synchronized keyword when
using its iterator which is done by asScala method. Does that make sense?
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