dao-jun opened a new pull request, #25891:
URL: https://github.com/apache/pulsar/pull/25891
### Motivation
Add a new component `RandomReader` to Pulsar client.
The key method of RandomReader is
```java
CompletableFuture<List<Message<T>>> read(MessageId startPosition, int
numberOfBatches);
```
so it provides the ability to read messages from a specified location
**without create a ManagedCursor**.
### Modifications
1. Proto changes for RandomReader
2. Broker side support for RandomReader
3. Add RandomReader public API to client
### Verifying this change
- [ ] Make sure that the change passes the CI checks.
*(Please pick either of the following options)*
This change is a trivial rework / code cleanup without any test coverage.
*(or)*
This change is already covered by existing tests, such as *(please describe
tests)*.
*(or)*
This change added tests and can be verified as follows:
*(example:)*
- *Added integration tests for end-to-end deployment with large payloads
(10MB)*
- *Extended integration test for recovery after broker failure*
### Does this pull request potentially affect one of the following parts:
<!-- DO NOT REMOVE THIS SECTION. CHECK THE PROPER BOX ONLY. -->
*If the box was checked, please highlight the changes*
- [ ] Dependencies (add or upgrade a dependency)
- [x] The public API
- [ ] The schema
- [ ] The default values of configurations
- [ ] The threading model
- [x] The binary protocol
- [ ] The REST endpoints
- [ ] The admin CLI options
- [ ] The metrics
- [ ] Anything that affects deployment
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