shibd commented on issue #14465:
URL: https://github.com/apache/pulsar/issues/14465#issuecomment-1059722148


   
[PIP-84](https://github.com/apache/pulsar/wiki/PIP-84-:-Pulsar-client:-Redeliver-command-add-epoch)
   
   In the current implementation, the  consumer epoch and broker epoch may be 
inconsistent. Unless reconnected, otherwise consumers will always filter 
message.
   
   When the consumer calls the `consumer.redeliverUnacknowledgedMessages()` 
method,  Consumer every time epoch + 1.
   But broker may be not increment. In the following code.
   
   
https://github.com/apache/pulsar/blob/4f1e39b6921ea401b8c27f17a041d06d85f8abf8/pulsar-broker/src/main/java/org/apache/pulsar/broker/service/persistent/PersistentDispatcherSingleActiveConsumer.java#L310-L322
   
   This unit test is caused by the inconsistency between the epoch of the 
consumer and the broker.
   
   @codelipenghui @congbobo184 Can you take a look?
   


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