Anti-entropy gossip
Sync full state (or diffs) with peers. Cassandra's gossip. Reliable convergence, higher bandwidth.
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Push vs pull vs push-pull
Push: sender initiates. Pull: receiver requests. Push-pull: both. Push-pull most efficient.
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Rumor mongering
Once value known, gossip only when 'infectious'. Efficient for single-value dissemination. Stops after M silent rounds.