Kafka - Advanced Stream Processing
What will happen if you try to query a state store that does not exist using streams.store("unknownStore", QueryableStoreTypes.keyValueStore())?
What will happen if you try to query a state store that does not exist using streams.store("unknownStore", QueryableStoreTypes.keyValueStore())?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Recall behavior for missing stores
Querying a non-existent store throws InvalidStateStoreException in Kafka Streams.Step 2: Check options for exception
Only Throws InvalidStateStoreException mentions this exception, matching expected behavior.Final Answer:
Throws InvalidStateStoreException -> Option BQuick Check:
Missing store query = InvalidStateStoreException [OK]
Quick Trick: Missing store queries throw InvalidStateStoreException [OK]
Common Mistakes:
- Expecting null or empty result
- Thinking store auto-creates
- Confusing with Optional return types
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