lwclover opened a new pull request #3040:
URL: https://github.com/apache/rocketmq/pull/3040
In production practice，There is a situation that is starting many diffent
consumers and using web controls consumers starting and stoping at the same
time in one running process.
then I noticed a problem one day after stoping and starting consumers
using web，There was a consumer who reconsume messages a few days ago.
## What is the purpose of the change
fix issue below:
producing a ghost consumer at frequently start and stop consumers in the
same process，who can not consume message，but can pull messages and submit the
same consume offset.
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