Denovo1998 opened a new pull request, #17449:
URL: https://github.com/apache/pulsar/pull/17449
Fixes #17354
### Motivation
*Fixed the failure to use schema to create consumer after using AUTO-CONSUME
consumer to subscribe an empty topic, and Broker returned the error message as
`IncompatibleSchemaException("Topic does not have schema to check")`.*
### Modifications
*In PersistentTopic::addSchemaIfIdleOrCheckCompatible, when there is an
active consumer, but the consumer is using the AUTO_CONSUME schema to subscribe
to the topic. Continuing to create a schema consumer to subscribe to the topic
will fail.*
- When `numActiveConsumers != 0`, and check the schema of the currently
existing consumers is AUTO_CONSUME schema.
### Verifying this change
- [x] Make sure that the change passes the CI checks.
### Documentation
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- [ ] `doc-complete`
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