GitHub user lhotari added a comment to the discussion: Past Acknowledged 
messages are redelivered

a quick summary of what could be configured at least with Pulsar 4.0.7 (you 
should test this yourself to ensure that it really works):
```
managedLedgerMaxUnackedRangesToPersist=200000
managedLedgerMaxBatchDeletedIndexToPersist=200000
managedLedgerPersistIndividualAckAsLongArray=true
managedCursorInfoCompressionType=LZ4
managedLedgerInfoCompressionType=LZ4
````

GitHub link: 
https://github.com/apache/pulsar/discussions/23990#discussioncomment-14689487

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