Features

This section covers cross-cutting capabilities — things that aren't a single module but require following code through several. They are the right starting point if you're operating Kafka and want to understand "how does X work?" rather than "what's in this directory?".

Pages

• KRaft mode — the controller quorum, broker / controller / combined roles, and why ZooKeeper is gone.
• Replication — leaders, followers, ISR, fetcher threads, AlterPartition.
• Exactly-once semantics — idempotent producer, transactions, EOS for Streams and Connect.
• Tiered storage — KIP-405 — offloading cold segments to a remote store.
• ACLs and security — authentication mechanisms, the Authorizer SPI, ACL records on the metadata log.