poorbarcode opened a new pull request, #22479:
URL: https://github.com/apache/pulsar/pull/22479
### Motivation
**Background**
- When a topic is loading up, it will wait for the deduplication recovery to
be finished if deduplication is enabled.
- users can enable deduplication on the broker level, namespace level or
topic level.
- There is a scheduled task to acknowledge messages for the deduplication
cursor.
**Issue**
(Highlight) the scheduled task that acknowledges messages for the
deduplication cursor can only be created when the broker level deduplication is
enabled, leading to an infinite backlog of deduplication cursor; the next
deduplication recovery after a topic unloading will take a long time, which
leads to topic load timeout.
**A topic internal stats**
[topic-internal-stats.txt](https://github.com/apache/pulsar/files/14941515/topic-internal-stats.txt)
### Modifications
- Always start the scheduled task.
### 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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