[Solved] Given this Kafka CQRS code snippet:commands_topic = 'orders-commands' queries_topic = 'orders-queries' # Command handler writes event producer.send(commands_topic, {'orderId': 1, 'action':... | Kafka

Kafka - Event-Driven Architecture

Given this Kafka CQRS code snippet:

commands_topic = 'orders-commands'
queries_topic = 'orders-queries'

# Command handler writes event
producer.send(commands_topic, {'orderId': 1, 'action': 'create'})

# Query handler reads events
consumer.subscribe([queries_topic])

# What will the query handler receive?

AAn error because consumer subscribed to wrong topic

BThe 'create' command message sent by the producer

CAll messages from both topics automatically

DNo messages, because commands and queries use separate topics

Step-by-Step Solution

Solution:

Step 1: Analyze topic usage
The producer sends commands to 'orders-commands' topic, but the consumer subscribes to 'orders-queries' topic.
Step 2: Understand message flow
Since these are separate topics, the query handler will not receive messages sent to the commands topic.
Final Answer:
No messages, because commands and queries use separate topics -> Option D
Quick Check:
Separate topics mean no cross messages [OK]

Quick Trick: Commands and queries use different topics, no overlap [OK]

Common Mistakes:

Assuming consumer gets all messages from all topics
Thinking subscription to queries topic gets commands
Believing Kafka merges topics automatically

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More Kafka Quizzes

Given this Kafka CQRS code snippet:

Step 1: Analyze topic usage

Step 2: Understand message flow

Final Answer:

Quick Check:

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