sollhui opened a new pull request, #63664:
URL: https://github.com/apache/doris/pull/63664
### What problem does this PR solve?
When Kafka routine load is configured with `isolation.level=read_committed`,
the consumer may consume 0 rows while the task partition lag is still positive.
This can happen when upstream producers use Kafka transactions and some records
are not committed yet, so they are invisible to the read_committed consumer.
This PR adds an `OtherMsg` hint for this case:
- routine load task consumes 0 rows
- task partition lag is positive
- Kafka property `isolation.level=read_committed` is configured
The message helps users distinguish this case from ordinary no-data
consumption. A FE debug point and regression test are added to ensure the
warning can be reported deterministically.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [ ] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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