kfaraz opened a new pull request, #18311:
URL: https://github.com/apache/druid/pull/18311
### Description
`EmbeddedMsqRealtimeQueryTest` is a little flaky.
```java
Error: Errors:
Error:
EmbeddedMSQRealtimeQueryTest.test_selectJoinWithConcatVirtualDimension_dart:475
ยป Runtime org.apache.druid.rpc.HttpResponseException: Server error [400 Bad
Request]; body:
{"error":"druidException","errorCode":"invalidInput","persona":"USER","category":"INVALID_INPUT","errorMessage":"Object
'wiki_cgpbpkdo' not found (line [6], column
[6])","context":{"sourceType":"sql","line":"6","column":"6","endLine":"6","endColumn":"18"}}
```
This can happen due to a race condition where we fire the query before the
broker has discovered the datasource.
### Fix
- Latch on the Broker having discovered the datasource
<hr>
This PR has:
- [ ] been self-reviewed.
- [ ] using the [concurrency
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
(Remove this item if the PR doesn't have any relation to concurrency.)
- [ ] added documentation for new or modified features or behaviors.
- [ ] a release note entry in the PR description.
- [ ] added Javadocs for most classes and all non-trivial methods. Linked
related entities via Javadoc links.
- [ ] added or updated version, license, or notice information in
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
- [ ] added comments explaining the "why" and the intent of the code
wherever would not be obvious for an unfamiliar reader.
- [ ] added unit tests or modified existing tests to cover new code paths,
ensuring the threshold for [code
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
is met.
- [ ] added integration tests.
- [ ] been tested in a test Druid cluster.
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