Github user seyfe closed the pull request at:
https://github.com/apache/spark/pull/15425
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GitHub user seyfe opened a pull request:
https://github.com/apache/spark/pull/15425
[SPARK-17816] [Core] [Branch-2.0] Fix ConcurrentModificationException issue
in BlockStatusesAccumulator
## What changes were proposed in this pull request?
Replaced `BlockStatusesAccumulator`
