poorbarcode opened a new pull request, #25037:
URL: https://github.com/apache/pulsar/pull/25037
### Motivation
By default, the backlog of a subscription is got by `{num of entries
published} - {num of entries acknowleged}`
- `num of entries published`: `ManagedLedger.entriesAddedCounter`
- `num of entries acknowleged`: `ManagedLedger.messagesConsumedCounter`
There is bug that calculates the entries count between two positons in the
method `ManagedLedger.getNumberOfEntries`, which causes
`ManagedLedger.messagesConsumedCounter` going to a incorrect value. BTW, this
bug was introduced by https://github.com/apache/pulsar/pull/24938
It happens when the `{from position} < {currentLedger}:0` and `{to position}
> {currentLedger}:0 and {top position} < {LAC}`
### Modifications
Fix the bug.
### Documentation
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- [ ] `doc` <!-- Your PR contains doc changes. -->
- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
later -->
- [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
- [ ] `doc-complete` <!-- Docs have been already added -->
### Matching PR in forked repository
PR in forked repository: x
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