Apache Kafka
Apache Kafka is a distributed event-streaming platform used for high-performance data pipelines, streaming analytics, and event-driven applications.
What isZooKeeper’s Role in Kafka ?
Overview
ZooKeeper was traditionally used to manage the state of a Kafka cluster, including:
- Cluster membership
- Leader elections
Since Kafka 4.x
Kafka no longer requires ZooKeeper.
The KRaft (Kafka Raft) mode fully replaces it.
What is kafka KRaft Mode ?
Definition
KRaft (Kafka Raft) is Kafka’s built-in consensus protocol that lets Kafka manage its own metadata without ZooKeeper.
| Node Type | Responsibilities |
|---|---|
| Controller | Maintains cluster metadata, leader election, configs |
| Broker | Handles client traffic and persists topic data |
How kafka guarantees message ordering ?
Guarantee
Kafka guarantees message order only within a single partition.
For example, if messages M1 and M2 are sent to partition P0,
a consumer C1 will always read M1 before M2.
Important
Kafka does not guarantee order across different partitions.