Kafka - Performance Tuning
Given a Kafka topic with 3 partitions, what partition will a message with hash(key)=7 be assigned to if the partitioner uses hash(key) % partition_count?
Given a Kafka topic with 3 partitions, what partition will a message with hash(key)=7 be assigned to if the partitioner uses hash(key) % partition_count?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Calculate hash(key) % 3
hash(key)=7 % 3 = 1.Step 2: Apply modulo operation
hash(key) % 3 = 1 means message goes to partition 1.Final Answer:
Partition 1 -> Option BQuick Check:
Partition = hash(key) % count = 1 [OK]
Quick Trick: Partition = hash(key) mod partition count [OK]
Common Mistakes:
MISTAKES- Choosing partition 3 which does not exist (index starts at 0)
- Ignoring modulo operation
- Assuming random partition assignment
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