mattisonchao opened a new pull request #14940:
URL: https://github.com/apache/pulsar/pull/14940
### Motivation
- When ``TransactionMetadataStoreService#handleTcClientConnect`` invoke
method as bellow we omit exception.
```java
pulsarService.getBrokerService().checkTopicNsOwnership(TopicName
.TRANSACTION_COORDINATOR_ASSIGN.getPartition((int)
tcId.getId()).toString()).thenRun(() -> {
//.... omit some code
})
```
- Avoid frequent context switching using thread pools.
### Modifications
- Make ``checkTopicNsOwnership`` future return.
- Use ``thenComposeAsync`` to avoid context switching.
- Refactor some code.
### Verifying this change
- [x] Make sure that the change passes the CI checks.
### Documentation
- [x] `no-need-doc`
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