pkuwm removed a comment on issue #785: Fix the ConcurrentModificationException in ClusterEvent.java URL: https://github.com/apache/helix/pull/785#issuecomment-588753803 @i3wangyi I am a bit confused and not convinced by the root cause: "In ClusterEvent.java, the hashmap update itself while in its for loop". The maps `_eventAttributeMap` are different objects. So addAttribute() does not add the attributes to the original event's map, but the new event's different map. So I think the root cause could be another place (eg. another thread) updating the original event's map while in `for` loop.
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