How to Add Partitions to an Existing Topic in Kafka

Date: 2025-03-14

This article explains how to add partitions to a Kafka topic to improve performance and scalability. Kafka topics are divided into partitions for parallel processing and fault tolerance. The article details using the Kafka CLI command kafka-topics.sh to increase the number of partitions for an existing topic, and also shows how to do this programmatically using the Java AdminClient API. Increasing partitions requires careful consideration of message ordering and consumer rebalancing. Note that you can only increase, not decrease, the number of partitions using this method.

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