poorbarcode opened a new pull request, #16247:
URL: https://github.com/apache/pulsar/pull/16247
### Motivation
E.g. `TB.recover`, `topic.unload`, `lookup` executed at the same time:
| Time | `TB.recover` | `topic.unload` | `lookup-a` | `lookup-b` |
| ----------- | ----------- | ----------- | ----------- | ----------- |
| 1 | TB recover | | | |
| 2 | TB recover failure | topic.unload | | |
| 3 | topic.close | topic.close | | |
| 4 | brokerService.topics.remove(topicName) | | | |
| 5 | remove `topic` | | lookup | |
| 6 | | | create `topic'` | |
| 7 | | brokerService.topics.remove(topicName) | | |
| 8 | | remove `topic'` | | lookup |
| 9 | | | | create `topic''` |
In step 8:
- `topic'` removed from `broker-service-cache-mapping`, but it still exists
After step 9:
- we have two same topics: [`topic'`, `topic''`]
- `topic''` mapping in `broker-service-cache-mapping`
- `topic'` is not mapping in `broker-service-cache-mapping`, but it may be
used by the client.
We should remove “The specify Topic Refer” to prevent errors from concurrent
operations.
### Modifications
use `remove(key, value)` instead `remove(key)`.
### Documentation
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