Given a Kafka topic with 4 partitions, if a producer sends messages with keys "A", "B", "A", and "C", which partitions will the messages with key "A" go to?

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Kafka - Topics and Partitions

Given a Kafka topic with 4 partitions, if a producer sends messages with keys "A", "B", "A", and "C", which partitions will the messages with key "A" go to?

AEach message with key "A" goes to a different partition

BBoth messages with key "A" go to the same partition

CMessages with key "A" go to partition 0 only

DMessages with key "A" are sent to all partitions

Step-by-Step Solution

Solution:

Step 1: Understand key-based partitioning
Kafka hashes the key to assign a partition, so same keys map to the same partition.
Step 2: Apply this to messages with key "A"
Both messages with key "A" will go to the same partition to maintain order.
Final Answer:
Both messages with key "A" go to the same partition -> Option B
Quick Check:
Same key = same partition [OK]

Quick Trick: Same key always maps to same partition [OK]

Common Mistakes:

Assuming keys distribute randomly
Thinking same keys go to different partitions
Believing messages go to all partitions

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More Kafka Quizzes

Given a Kafka topic with 4 partitions, if a producer sends messages with keys "A", "B", "A", and "C", which partitions will the messages with key "A" go to?

Step 1: Understand key-based partitioning

Step 2: Apply this to messages with key "A"

Final Answer:

Quick Check:

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