massakam opened a new pull request #3092: Fix process of calculating msgBacklog included in stats URL: https://github.com/apache/pulsar/pull/3092 `msgBacklog` included in the stats of the topic sometimes remains 1 even though all messages have been consumed. Normally, the number of messages in the backlog is calculated by the expression `entriesAddedCounter - messagesConsumedCounter`. However, if this result is less than 0, the number of entries is calculated from `markDeletePosition` and `lastConfirmedEntry`. At this time, the value passed to `getNumberOfEntries()` is a closed interval, so the return value of `getNumberOfEntries()` is 1 larger than the actual number of entries. https://github.com/apache/pulsar/blob/5fde6f32b038327163ebf7babc556b72f337a1a1/managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/ManagedCursorImpl.java#L694-L700
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