[Solved] What is wrong with the following Kafka Streams code snippet for accessing a state store?ReadOnlyKeyValueStore<String, String> store = streams.store("metricsStore"); String metric = store.get("cpu"); | Kafka

Kafka - Advanced Stream Processing

What is wrong with the following Kafka Streams code snippet for accessing a state store?

ReadOnlyKeyValueStore<String, String> store = streams.store("metricsStore");
String metric = store.get("cpu");

AThe get() method cannot be used on ReadOnlyKeyValueStore

BThe store name "metricsStore" is invalid

CMissing the QueryableStoreTypes parameter in the store() method call

DThe variable 'metric' should be an integer, not a string

Step-by-Step Solution

Solution:

Step 1: Check store() method signature
The store() method requires two parameters: the store name and the store type.
Step 2: Identify missing parameter
The code omits the second parameter QueryableStoreTypes.keyValueStore(), which is mandatory.
Final Answer:
Missing the QueryableStoreTypes parameter in the store() method call -> Option C
Quick Check:
store() needs store type [OK]

Quick Trick: Always specify QueryableStoreTypes when calling store() [OK]

Common Mistakes:

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What is wrong with the following Kafka Streams code snippet for accessing a state store?