[Solved] If you increase the partition count of an existing Kafka topic, what is a likely effect? — Ans: New partitions will be added but existing messages remain in original partitions | Kafka

Kafka - Performance Tuning

If you increase the partition count of an existing Kafka topic, what is a likely effect?

AMessages will be evenly redistributed across all partitions automatically

BNew partitions will be added but existing messages remain in original partitions

CAll consumers must be restarted to read from new partitions

DThe topic will be deleted and recreated with new partition count

Step-by-Step Solution

Solution:

Step 1: Understand partition increase behavior
Kafka adds new partitions but does not move existing messages.
Step 2: Effect on existing data and consumers
Existing messages stay in old partitions; new messages can go to new partitions.
Final Answer:
New partitions will be added but existing messages remain in original partitions -> Option B
Quick Check:
Partition increase = Add partitions only [OK]

Quick Trick: Increasing partitions adds new ones, old data stays put [OK]

Common Mistakes:

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If you increase the partition count of an existing Kafka topic, what is a likely effect?