Chapter IV: Distributed System Concerns
Heartbeats
Periodic signals that let a system detect when a node has failed.
In short
Heartbeats are periodic "I'm alive" signals that let a system detect when a node has failed.
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Key takeaways
- Periodic signals detect node failure when beats stop arriving.
- Balance interval: too fast wastes resources, too slow delays detection.
- Tolerate a few missed beats to avoid false-positive failures.