francisoliverlee commented on issue #711:
URL: 
https://github.com/apache/rocketmq-client-go/issues/711#issuecomment-897860121


   ### as java client does in following files, client no need to Unsubscribe 
retry topic.
   
   > 
https://github.com/apache/rocketmq/blob/a20f31bb3de242756542c552d7212a7a40000ba4/client/src/main/java/org/apache/rocketmq/client/consumer/DefaultMQPushConsumer.java#L792
   
   > 
https://github.com/apache/rocketmq/blob/a20f31bb3de242756542c552d7212a7a40000ba4/client/src/main/java/org/apache/rocketmq/client/impl/consumer/DefaultMQPushConsumerImpl.java#L932
   
   ## as checked broker codes,  subscribtion for retry topic would never 
delete. broker update subscribtions on heartbeat:
   > 
https://github.com/apache/rocketmq/blob/a20f31bb3de242756542c552d7212a7a40000ba4/broker/src/main/java/org/apache/rocketmq/broker/processor/ClientManageProcessor.java#L75


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