Heartbeat
Version 1.0.0 · Updated 2026-07-28
CORE DEFINITION
A signal sent at regular intervals to say I am still alive, proving that a system or node is still running normally. If no heartbeat arrives within a set period, the node is treated as dead. Its scaffold function is solving the liveness-detection problem: when the internal state of another party cannot be observed directly, a periodic handshake is used to infer its health. This is the basis of all failure detection and failover mechanisms.
SCAFFOLDING EFFECT
Reduce cognitive load
- Liveness detection: infer health from a periodic signal when internal state is unobservable. - Failure detection: a missing heartbeat within the timeout marks a node as dead. - Failover basis: detecting death is the precondition for switching to a standby node.
Anchor fast decisions
The heart generates electrical impulses from the sinoatrial node, which are conducted through the conduction system to cause orderly contraction of the atria and ventricles, pumping blood. Autonomic nerves and hormones regulate heart rate to meet metabolic demands, and its rhythm is a precise feedback system of electromechanical coupling.
MINIMUM ACTION
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Heartbeatverified
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