A streaming app tracks each bus’s last-seen timestamp so stale vehicles can be flagged. What concept does maintaining that per-bus value illustrate?
Select an answer to reveal the explanation.
Short Explanation
Remembering each bus’s last beep means the job has a pocket notebook—state—keyed by bus. Pure stateless one-and-done maps forget the past; printed-only timetables are not streaming state. Keep the timestamp, spot the stale vehicle.
Full Explanation
Stateful streaming maintains information across events, such as per-bus last-seen timestamps used to detect staleness. Stateless map-only batch, printed timetable replacements, and mandatory timestamp deletion before alerts do not describe that concept.