Kafka - Topics and Partitions
You have a Kafka topic with 4 partitions. You want to ensure that all messages with the same customer ID go to the same partition to keep their order. Which approach should you use?
You have a Kafka topic with 4 partitions. You want to ensure that all messages with the same customer ID go to the same partition to keep their order. Which approach should you use?
hard📝 Application Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand how Kafka assigns partitions
Kafka uses the message key to decide which partition a message goes to, ensuring order for messages with the same key.Step 2: Apply to customer ID ordering requirement
Using the customer ID as the key ensures all messages for that customer go to the same partition and keep order.Step 3: Evaluate other options
Sending all to partition 0 limits scalability; random keys break order; separate topics complicate management.Final Answer:
Use the customer ID as the message key when producing messages -> Option DQuick Check:
Key = customer ID for order [OK]
Quick Trick: Use customer ID as key to keep order in one partition [OK]
Common Mistakes:
- Sending all messages to one partition reduces scalability
- Using random keys breaks message order
- Creating multiple topics is unnecessary and complex
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