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Design shared state and deterministic routing for HA and multi-region #28

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opened 2026-07-16 22:17:17 +02:00 by Kyuubi · 0 comments
Kyuubi commented 2026-07-16 22:17:17 +02:00
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Parent: #1
Identified by: #23

Classification

Post-v1. Rendezvous v1 remains one active process with bounded in-memory state and one advertised mediator endpoint.

Trigger

Start this work when the 99.5% single-active objective is insufficient, planned maintenance must preserve listings, or a region needs multiple active mediator endpoints.

Outcome

Design and implement shared TTL/CAS state, deterministic attempt-to-mediator routing, fencing/ownership, failover semantics, and multi-node consistency before making any HA, active-active, or multi-region claim.

Acceptance criteria

  • State ownership and split-brain behavior are specified and adversarially tested.
  • HTTP and UDP for one attempt route to compatible authoritative state.
  • Failover preserves documented safety and privacy invariants.
  • Multi-node capacity, restart, partition, and recovery evidence is versioned.
  • Deployment and rollback docs make the supported topology explicit.
Parent: #1 Identified by: #23 ## Classification Post-v1. Rendezvous v1 remains one active process with bounded in-memory state and one advertised mediator endpoint. ## Trigger Start this work when the 99.5% single-active objective is insufficient, planned maintenance must preserve listings, or a region needs multiple active mediator endpoints. ## Outcome Design and implement shared TTL/CAS state, deterministic attempt-to-mediator routing, fencing/ownership, failover semantics, and multi-node consistency before making any HA, active-active, or multi-region claim. ## Acceptance criteria - State ownership and split-brain behavior are specified and adversarially tested. - HTTP and UDP for one attempt route to compatible authoritative state. - Failover preserves documented safety and privacy invariants. - Multi-node capacity, restart, partition, and recovery evidence is versioned. - Deployment and rollback docs make the supported topology explicit.
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Kyuubi schmidt.florian (Florian Schmidt)
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Reference: HeiKyu/Rendezvous#28