[Solved] Given a Kafka topic with 3 partitions, what happens if you send messages with different keys in this... producer.send(new ProducerRecord("topic", "key1", "msg3"));What is true about message order? | Kafka

Kafka - Topics and Partitions

Given a Kafka topic with 3 partitions, what happens if you send messages with different keys in this code?

producer.send(new ProducerRecord<>("topic", "key1", "msg1"));
producer.send(new ProducerRecord<>("topic", "key2", "msg2"));
producer.send(new ProducerRecord<>("topic", "key1", "msg3"));

What is true about message order?

AAll messages are ordered in the same partition.

B"msg1" and "msg3" are ordered; "msg2" may be in a different partition.

C"msg2" and "msg3" are ordered; "msg1" is unordered.

DMessages are randomly ordered regardless of keys.

Step-by-Step Solution

Solution:

Step 1: Identify partition assignment by key
Messages with the same key ("key1") go to the same partition; "key2" goes to another partition.
Step 2: Understand ordering within partitions
"msg1" and "msg3" share "key1" so they keep order; "msg2" with "key2" is separate.
Final Answer:
"msg1" and "msg3" are ordered; "msg2" may be in a different partition. -> Option B
Quick Check:
Same key = same partition order [OK]

Quick Trick: Same key means same partition and order [OK]

Common Mistakes:

Assuming all messages go to one partition
Thinking different keys keep order together
Believing order is global across partitions

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More Kafka Quizzes

Given a Kafka topic with 3 partitions, what happens if you send messages with different keys in this code?

Step 1: Identify partition assignment by key

Step 2: Understand ordering within partitions

Final Answer:

Quick Check:

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