One scheduled job runs exactly once across many servers.
Name it
Say what this problem really is, professionally — the concept + when it bites. practice the framing →
Explain it out loud
Say it in your own words — but hit these: distributed lock · shedlock · only one instance · multi-instance · lease · idempotent
checking microphone…
Code it (7-step rhythm, narrate)
Clarify → approach → data model → narrate → edge → test → tradeoff. AI off. Lab: distributed lock →
Edge cases — say + handle each
Say the trade-off
“You add a coordination point and a lease to tune, in exchange for exactly-once execution.”
checking microphone…
Answer the follow-up
What if the instance holding the lock dies mid-job?