ZhangShenao commented on issue #700: Potential Concurrent Risk in RouteInfoManager URL: https://github.com/apache/rocketmq/issues/700#issuecomment-456297521 > 迭代过程中，如果HashMap中元素有增或删，确实会直接报错，并影响下次调度。由于执行得不频繁，并且broker机器变化也不频繁，因此很少会报错。这块代码确实需要优化一下，做个try catch或者使用ConcurrentHashMap，都可以解决问题。 https://github.com/apache/rocketmq/pull/699/files 尝试提交了pr，麻烦review
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