[Verse 1] Migration's humming, bridge mode running ZooKeeper's still the puppet master But if the wheels start coming loose You've got an exit, deploy it faster Check your metadata logs for errors Before the point of no return When KRaft controllers take the throne There's no path back, the bridge will burn [Chorus] Roll it back, roll it back Before the metadata shifts to KRaft Watch the metrics, catch the cracks Migration's got your cluster's back But past the line, there's no rewind Controllers sealed, the fate is signed Roll it back, roll it back Before you cross that final track [Verse 2] Common failures love to hide In partition reassignments Network splits can break the flow Controller elections violent Monitor your throughput curves Latency spikes tell the story If consumer groups start lagging hard Time to abort, forget the glory [Chorus] Roll it back, roll it back Before the metadata shifts to KRaft Watch the metrics, catch the cracks Migration's got your cluster's back But past the line, there's no rewind Controllers sealed, the fate is signed Roll it back, roll it back Before you cross that final track [Bridge] Lab four teaches both the paths Happy migration, rollback math Test cluster's where you learn to fail Practice makes the perfect trail JMX metrics paint the scene Under-replicated partitions scream Broker health checks, topic state Don't migrate if you're running late [Verse 3] Disk space errors, memory leaks Quorum failures, network freaks These are signs to stop the dance ZooKeeper's still your safe romance But once controllers claim their crown Metadata lives in KRaft town No going back to ZK's embrace That bridge is gone without a trace [Chorus] Roll it back, roll it back Before the metadata shifts to KRaft Watch the metrics, catch the cracks Migration's got your cluster's back But past the line, there's no rewind Controllers sealed, the fate is signed Roll it back, roll it back Before you cross that final track [Outro] Bridge mode's the safety net you need Until KRaft proves it can succeed Know your limits, trust the signs Rollback saves you every time
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