Kafka Cluster Setup & Internals Explained | Leader, Replica, ISR Deep Dive | Kafka Tutorial #4

Welcome to the ultimate Apache Kafka Cluster Setup and Internals Deep Dive — a 2.5-hour hands-on tutorial covering everything you need to know to set up and truly understand a Kafka cluster in both Zookeeper-based and KRaft mode (no Zookeeper) environments.

This video is designed to help you master Kafka architecture, leader-follower mechanics, replica assignment, in-sync replica (ISR) logic, and much more — from the ground up.

📌 What’s Covered:

Kafka cluster setup (3-node configuration)

Topics, partitions, leaders, and replicas

Kafka Controller internals

ISR and how failover happens

Kafka metadata and controller quorum

Kafka 4.x cluster setup (No Zookeeper / KRaft Mode)

✅ Whether you're preparing for an interview, running Kafka in production, or just want to understand the internals the way they were meant to be, this deep dive will help you build solid Kafka intuition.

Timestamp
-------------------
00:00:00 Intro -Kafka Foundations Tutorial
00:01:15 Start Kafka (KRaft mode)
00:03:27 3‑Partition Topic on Single Broker
00:06:04 Topic inside a Cluster
00:12:20 3‑Node Cluster Setup (Zookeeper Demo)
00:23:38 Cluster Topic Creation Demo
00:28:44 First Look at Leaders
00:30:59 First Look at Replicas
00:35:12 Leader vs Replica : Duties
00:41:34 Replication Factor vs Broker Count
00:43:50 Leader & Follower on Same Broker?
00:50:14 One Leader per Partition Rule
00:52:13 KAFKA 4 UPGRADE – KRaft (No Zookeeper)
00:54:16 Kafka Controller Explained
00:57:13 Broker/Controller Failure Demo
00:58:44 3‑Broker KRaft Cluster Spin‑up
01:01:00 Reading `kafka-metadata-quorum`
01:05:23 Controller Election Walk‑through
01:08:47 Leader Allocation Logic
01:11:07 Controller Responsibilities Recap
01:12:05 Producer Metadata Request Path
01:16:32 Allocating Follower Replicas
01:21:38 Producer–Leader–Follower Demo
01:26:15 Follower Work Explained
01:27:45 Follower‑to‑Leader Failover
01:28:35 In‑Sync Replicas Hands‑On
01:35:11 Inside the ISR Mechanism
01:39:35 Staying in the ISR List
01:44:49 End‑to‑End Produce/Consume
01:47:04 Min‑ISR Concept
01:48:47 Setting Min‑ISR on a Topic
01:59:43 Full Kafka 4 Cluster Setup (No ZK)
02:04:06 Broker 1 `server.properties`
02:07:12 Controller Port Config
02:08:45 Broker 2 & 3 Configs
02:11:33 Initial Controller IDs
02:16:28 Generating Cluster & Broker IDs
02:22:28 Controller Quorum Voters
02:26:47 Launch All 3 Nodes

#apachekafka #kafkatutorial #kafkaforbeginners
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Видео Kafka Cluster Setup & Internals Explained | Leader, Replica, ISR Deep Dive | Kafka Tutorial #4 канала Selenium Express