Use CopyOnWriteArraySet for ConnectionGroup#connectionSet to avoid iterator fast-fail #2559
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sczyh30
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Describe what this PR does / why we need it
利用 CopyOnWriteArraySet解决并发修改会存在集合快速失败问题
Does this pull request fix one issue?
参考PR#2519
Describe how you did it
使用CopyOnWriteArraySet