Github user zsxwing 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?
@seyfe The comment you are deleting explains why it's safe: the driver
doesn't modify `BlockStatusesAccumulator`.
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