[Verse 1]
ZooKeeper's been the guardian for so many years
Managing metadata, calming all our fears
But now there's a new way to handle the load
KRaft consensus takes us down a different road
No more external systems to maintain and scale
Kafka's got its own story to tell
[Chorus]
Leader election, log replication
Committed entries through the nation
KRaft controller quorum standing strong
No ZooKeeper needed, we've moved along
Metadata topics flowing free
This is how it's meant to be
[Verse 2]
Raft protocol with leaders at the helm
Three phases guide us through this realm
Follower, candidate, then leader takes control
Heartbeats keep the system on a roll
Log entries replicated across the quorum
Majority consensus, that's the forum
[Chorus]
Leader election, log replication
Committed entries through the nation
KRaft controller quorum standing strong
No ZooKeeper needed, we've moved along
Metadata topics flowing free
This is how it's meant to be
[Bridge]
Migration path from old to new
Rolling upgrade sees you through
First the controllers make the switch
Then the brokers join without a glitch
Dual-write mode helps you transition
Legacy support during intermission
[Verse 3]
Kafka four point oh brings the change
ZooKeeper mode is out of range
Faster failover, seconds not minutes
Partition scaling with no limits
Metadata log stores the state
Performance improvements truly great
[Chorus]
Leader election, log replication
Committed entries through the nation
KRaft controller quorum standing strong
No ZooKeeper needed, we've moved along
Metadata topics flowing free
This is how it's meant to be
[Outro]
From ensemble old to quorum new
KRaft's the future coming through
Controllers handle all the load
Welcome to the KRaft mode