Demogorgon314 opened a new pull request #13332:
URL: https://github.com/apache/pulsar/pull/13332
### Motivation
When we use a multi-topic reader, the `hasMessageAvailable` method might
have the wrong behavior, since the multi-topics consumer receives all messages
from the single-topic consumer, the single-topic consumer `hasMessageAvailable`
might always be `false` (The lastDequeuedMessageId reach to the end of the
queue, all message enqueue to multi-topic consumer's `incomingMessages` queue).
We should check the multi-topics consumer `incomingMessages` size > 0 when
calling `hasMessageAvailable `.
### Modifications
1. Add a check of `incomingMessages` size > 0
2. Add units test `testHasMessageAvailableAsync` to verify the behavior.
### Documentation
Need to update docs?
- [ ] `doc-required`
(If you need help on updating docs, create a doc issue)
- [x] `no-need-doc`
(Please explain why)
- [ ] `doc`
(If this PR contains doc changes)
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