[GitHub] [rocketmq] odbozhou commented on issue #3443: [POP] PopReviveService will consume reviveTopic repeatedly when use pop model to consume.

[GitBox <gi...@apache.org>]

odbozhou commented on issue #3443:
URL: https://github.com/apache/rocketmq/issues/3443#issuecomment-956046236


   In order to prevent the message from being lost. Revive topic queue Offset update needs to pass ck msg. Revive topic contains both ck msg and ack msg. If the offset is updated directly by the number of Revive topic queue messages, there is a possibility of message loss. For example, some ck msgs are not confirmed by ack msg. , And without sending the retry topic, the offset of the receive topic is updated directly.
   There is a possibility of repetition of ack msg due to the network or other reasons. The message corresponding to ack has been acked, and ack will be consumed repeatedly, but it has no effect. These ack msg will not be consumed repeatedly when the new ck msg is updated. 


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