Fast-forward to today's Zaqar
summary
Zaqar now offers multi‑tenant messaging with subscriptions, notifications and pluggable transports and storage engines — current backends include MongoDB, Redis and a Swift patch, and transports include an HTTP v2 API and partial WebSocket support. Claims, pre‑assigned URL tokens and pools are implemented; guarantees (at‑least‑once, optional FIFO) depend on deployment and storage configuration. Several OpenStack services adopt Zaqar in the Liberty cycle; durability and horizontal scaling work only when the chosen backends are configured correctly.
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