poorbarcode opened a new pull request, #24622:
URL: https://github.com/apache/pulsar/pull/24622
### Motivation
**Background**: the steps of expiry of a topic
- Call expiry for each subscription
- The subscription finds the target position, then calls mark deleting for
the cursor
- Call expiry for each replicator
- The replicator finds the target position, then calls mark deleting for
the cursor
So the task calls for finding target position many times when a topic
expires. But the finding position operation is really expensive
### Modifications
Since all of the tasks that find the target position that relates to the
same topic will get the same result, we can call the finding operation at most
once, during expiring messages for a topic
### Documentation
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- [ ] `doc-required` <!-- Your PR changes impact docs and you will update
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- [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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