Achieving exactly-once delivery with Ably

Exactly-once delivery is a desirable message guarantee in distributed pub/sub systems, ensuring that each message is delivered precisely once. Ably, a realtime pub/sub messaging platform, provides exactly-once guarantees by acting as the broker in data streaming pipelines and offering capabilities such as idempotent publishing and connection state recovery. The platform ensures fault tolerance through regional and global redundancy, enabling it to continue operations even if components fail without sacrificing quality of service. Ably supports various protocols for real-time subscriptions and integrations with other systems, providing exactly-once guarantees as long as the platforms and services receiving messages support an idempotent interface.