sijie commented on issue #5969: Acked messages unexpectedly redelivered when others are negatively acked URL: https://github.com/apache/pulsar/issues/5969#issuecomment-570101434 @jerrypeng there are many ways to avoid serialization and deserialization. Broker can deliver a bit metadata along with the batches to tell the client what messages are acked. Clients can filter out the already delivered messages during deserialization at client side. The ability to control cursor tracking at the message level is a requirement for transactions anyway. We'd resolve the problem in single place.
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