Kafka - Advanced Stream Processing
Which of the following code snippets correctly creates a persistent key-value state store named
userStore using Kafka Streams Java API?Which of the following code snippets correctly creates a persistent key-value state store named userStore using Kafka Streams Java API?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify persistent store creation method
Kafka Streams provides factory methods in the Stores class to create state stores.Step 2: Persistent key-value store method
The methodStores.persistentKeyValueStore(String name)creates a persistent key-value store.Step 3: Evaluate options
Stores.persistentKeyValueStore("userStore") uses the correct method; B creates an in-memory store, C is invalid syntax, D is incorrect usage.Final Answer:
Stores.persistentKeyValueStore("userStore") -> Option DQuick Check:
Persistent store uses Stores.persistentKeyValueStore() [OK]
Quick Trick: Use Stores.persistentKeyValueStore() for persistent stores [OK]
Common Mistakes:
- Using inMemoryKeyValueStore for persistence
- Trying to instantiate KeyValueStore directly
- Calling addStateStore with just a string
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