[Solved] Why does Kafka not allow decreasing the partition count of a topic after creation? — Ans: Because decreasing partitions would cause data loss and disrupt message ordering | Kafka

Kafka - Performance Tuning

Why does Kafka not allow decreasing the partition count of a topic after creation?

ABecause partition count is stored in Zookeeper and cannot be changed

BBecause Kafka automatically merges partitions internally

CBecause decreasing partitions improves performance but is not supported yet

DBecause decreasing partitions would cause data loss and disrupt message ordering

Step-by-Step Solution

Solution:

Step 1: Understand partition data storage
Each partition stores messages independently; removing partitions risks data loss.
Step 2: Impact on ordering and data integrity
Decreasing partitions breaks ordering guarantees and causes message loss.
Final Answer:
Because decreasing partitions would cause data loss and disrupt message ordering -> Option D
Quick Check:
Partition decrease = data loss risk [OK]

Quick Trick: Partition count decrease risks data loss and ordering [OK]

Common Mistakes:

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Why does Kafka not allow decreasing the partition count of a topic after creation?