fxbing opened a new issue #4933: Backlog size calculation errors can result in unlimited messages being produced URL: https://github.com/apache/pulsar/issues/4933 **Describe the bug** Backlogs are sets of unacknowledged messages for a topic that have been stored by bookies even if not consumed. But in fact, if the topic has not been consumed, you can produce unlimited messages. https://github.com/apache/pulsar/blob/be7b24f9f8aa67b2235e523485249aef8d2a611a/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedLedgerImpl.java#L921-L926 **To Reproduce** Set a limited BaclogQuotaSize to produce unlimited messages without consuming. **Expected behavior** Limited production message
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