HeartSaVioR commented on issue #25672: [SPARK-28967][CORE] Include cloned version of "properties" to avoid ConcurrentModificationException URL: https://github.com/apache/spark/pull/25672#issuecomment-527912932 I'm not 100% sure what's happening, but `properties` is from `localProperties` in SparkContext which is open to modify via `SparkContext.setLocalProperty`. The method is called from lots of places, so it's likely to encounter the case. That's why we also cloned `properties` for `JobSubmitted`.
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