codelipenghui opened a new pull request, #16670:
URL: https://github.com/apache/pulsar/pull/16670
Fixes #16667
### Motivation
Fix the consumer does not abide by the max unacks limitation.
The root cause is the dispatcher only cares about the flow permits while
dispatching messages but doesn't care if the dispatched messages
will exceed the max unacks limitation.
The issue is easy to reproduce if max_unacks < receiver_queue_size
### Modifications
Calculate the dispatch messages count for a consumer with
`max_unacks - unacks`
### Verifying this change
A new test added to verify the consumer will not receive
messages more than max unacks limitation
### Documentation
Check the box below or label this PR directly.
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- [x] `doc-not-needed`
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- [ ] `doc`
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- [ ] `doc-complete`
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