wqliang opened a new issue #670: ConcurrentModificationException occurred when querying producer connection list URL: https://github.com/apache/rocketmq/issues/670 I got a ConcurrentModificationException when querying producer connection list by tools. ProducerManage.getGroupChannelTable() clones a new copy of groupChannelTable, in which the key is group name and the value is a HashMap. (see link 1) The values in the result HashMap are still the same reference of HashMap in "groupChannelTable". While retrieving the result HashMap, there may be a ConcurrentModificationException when the original groupChannelTable changes at the same time. (see link 2) link 1: https://github.com/apache/rocketmq/blob/795eae6f44587eaaf770571160a604a953fa8716/broker/src/main/java/org/apache/rocketmq/broker/client/ProducerManager.java#L56 link 2: https://github.com/apache/rocketmq/blob/795eae6f44587eaaf770571160a604a953fa8716/broker/src/main/java/org/apache/rocketmq/broker/processor/AdminBrokerProcessor.java#L631 **BUG REPORT** 1. Please describe the issue you observed: - What did you do (The steps to reproduce)? query the producer connection list by tools while there is producer-client disconnecting or new producer connecting. - What did you see instead? ConcurrentModificationException occurred 2. Please tell us about your environment: rocketmq-4.3.0
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