Demogorgon314 opened a new pull request #13634:
URL: https://github.com/apache/pulsar/pull/13634
Fixes #13605
### Motivation
Currently, the multiTopicReader `hasMessageAvailable` might get the wrong
result, we must check `numMessagesInQueue() > 0` again after finish all
consumer `hasMessageAvaliableAsync` future, bacause some message might already
in `MultiTopicsConsumerImpl#incomingMessages`.
### Modifications
* Fix the wrong multi-topic has message available behavior.
* Use `reader.readNextAsync()` instead of block method `reader.readNext()`.
* Reduce the units test running time by changing `MultiTopicsReaderTest` to
use `@BeforeClass`, `@AfterClass`.
### Documentation
Need to update docs?
- [x] `no-need-doc`
This is a bug fix, no need doc.
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