[Solved] Consider the following Kafka Streams code snippet. What will be printed if the key "order789" exists with value "completed" in the orderStore?ReadOnlyKeyValueStore<String, String> store = streams.... | Kafka

Kafka - Advanced Stream Processing

Consider the following Kafka Streams code snippet. What will be printed if the key "order789" exists with value "completed" in the orderStore?

ReadOnlyKeyValueStore<String, String> store = streams.store("orderStore", QueryableStoreTypes.keyValueStore());
String status = store.get("order789");
System.out.println(status);

Anull

B"order789"

C"completed"

DException thrown

Step-by-Step Solution

Solution:

Step 1: Retrieve the store
The store is correctly retrieved as a read-only key-value store.
Step 2: Get the value for the key
Calling store.get("order789") returns the value associated with the key if it exists.
Step 3: Print the value
Since the key exists with value "completed", that value is printed.
Final Answer:
"completed" -> Option C
Quick Check:
Key exists, so value returned [OK]

Quick Trick: store.get(key) returns value or null if absent [OK]

Common Mistakes:

Assuming the key returns the key itself
Expecting null when key exists
Not handling exceptions for missing stores

Master "Advanced Stream Processing" in Kafka

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

More Kafka Quizzes

Consider the following Kafka Streams code snippet. What will be printed if the key "order789" exists with value "completed" in the orderStore?

Step 1: Retrieve the store

Step 2: Get the value for the key

Step 3: Print the value

Final Answer:

Quick Check:

Want More Practice?