[Verse 1]
In the world of distributed systems today
We need consensus to show us the way
Three key players in this protocol dance
Leader election gives structure a chance
One node rises to coordinate the flow
While followers listen to what they should know
Safety first with our guarantees strong
Raft consensus keeps data along
[Chorus]
Leader, log, safety - three pillars standing tall
Pull-based replication when Kafka makes the call
Epoch-based fencing keeps the old leaders out
Raft consensus protocol, that's what it's about
Leader, log, safety - remember these three
Distributed consensus sets your data free
[Verse 2]
Kafka takes Raft but makes it its own
Pull-based replication, not push to the phone
Followers request the updates they need
Instead of the leader controlling the feed
Epochs act like barriers, fencing the past
Old leaders can't write when their time didn't last
This divergence from textbook makes Kafka shine
Optimized for throughput by design
[Chorus]
Leader, log, safety - three pillars standing tall
Pull-based replication when Kafka makes the call
Epoch-based fencing keeps the old leaders out
Raft consensus protocol, that's what it's about
Leader, log, safety - remember these three
Distributed consensus sets your data free
[Bridge]
ZooKeeper had ZAB, atomic broadcast way
But KRaft mode changes how we play
Three nodes in Docker, compose them with care
Metadata shell shows the quorum health there
No more external coordination needed
Self-managing clusters, complexity defeated
[Verse 3]
Set up your lab with three nodes to test
Docker compose makes deployment the best
Run kafka-metadata to verify the state
Quorum health check, don't hesitate
From ZAB to Raft, the evolution's clear
Simpler architecture, future is here
[Chorus]
Leader, log, safety - three pillars standing tall
Pull-based replication when Kafka makes the call
Epoch-based fencing keeps the old leaders out
Raft consensus protocol, that's what it's about
Leader, log, safety - remember these three
Distributed consensus sets your data free
[Outro]
KRaft mode rising, ZooKeeper's done
Raft consensus protocol, the battle is won
Three simple concepts to keep in your mind
Leader, log, safety - leave the old ways behind