Kafka - Performance Tuning
Given a Kafka topic with 4 partitions, what will be the partition number for a message with key hash % 4 = 2?
Given a Kafka topic with 4 partitions, what will be the partition number for a message with key hash % 4 = 2?
medium📝 Predict Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Understand partition assignment by key hash
Kafka assigns messages to partitions by taking the key hash modulo the number of partitions.Step 2: Calculate partition number
Given key hash % 4 = 2, the message goes to partition 2 (zero-based indexing).Final Answer:
Partition 2 -> Option CQuick Check:
Key hash % partitions = partition number [OK]
Quick Trick: Partition = key hash modulo partition count [OK]
Common Mistakes:
- Confusing modulo result with partition index
- Assuming partitions start at 1 instead of 0
- Ignoring key hash in partition calculation
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