[Bug]The significant downsizing of the business resulted in a large number of message duplicates.

[sqtce]

Before Creating the Bug Report

• [X] I found a bug, not just asking a question, which should be created in GitHub Discussions.

• [X] I have searched the GitHub Issues and GitHub Discussions of this repository and believe that this is not a duplicate.

• [X] I have confirmed that this bug belongs to the current repository, not other repositories of RocketMQ.

Runtime platform environment

Centos7.6

RocketMQ version

4.7.0

JDK Version

1.8.0

Describe the Bug

During a significant downsizing of the business, a large number of message duplicates occurred. Additionally, there was an unstable registration of consumers on another broker, leading to a backlog of consumer consumption. The hardware watermarks were normal, and network connectivity was verified as normal by Alibaba Cloud. The problematic broker generated the following log entries: 2023-06-25 22:19:38 WARN NettyServerNIOSelector_16_15 - send a request command to channel </10.17.17.9:43606> failed. The problematic broker is printing the following log entries in large quantities: 2023-06-25 22:19:40 WARN NettyServerCodecThread_10 - event queue size[10001] enough, so drop this event NettyEvent [type=CONNECT, remoteAddr=10.13.10.51:59658, channel=[id: 0x4e4915b9, L:/10.11.1.1 6:10911 - R:/10.13.10.51:59658]]， Restarting the broker resolves the issue.

Steps to Reproduce

What was observed instead?

What Did You Expect to See?

Large message backlog and duplicated message consumption.

What Did You See Instead?

How to resolve it.

Additional Context

No response

[github-actions[bot]]

This issue is stale because it has been open for 365 days with no activity. It will be closed in 3 days if no further activity occurs.

[github-actions[bot]]

This issue was closed because it has been inactive for 3 days since being marked as stale.