ADR-0023 — Edge read replicas in the browser (Proposed)#6
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Record, as a proposed not-yet-built capability, a read-only non-voting learner replica pushed to the client (browser): bootstrap from a chunked snapshot, tail the committed log over a pull-based stream, apply commands to a local instance of the deterministic StateMachine, and serve reads locally (eventually consistent; read-your-writes via a session read-index; optional audit-chain verification). Captures the shape, the pros (local read latency, reactive UI, read scaling at zero consensus cost, offline reads, end-to-end tamper-evidence), the cons (eventual consistency, mandatory partial replication, the authz-vs-determinism tension, determinism across client builds, cold-start cost), and the dependency order (non-voting learner role → pull/streaming transport → scoped partial replication + per-client authz). Indexed in docs/adr/README.md. Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]> Claude-Session: https://claude.ai/code/session_01NneoGGKxBp5ZExL7D7i1Lu
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Summary
Adds ADR-0023 — Edge read replicas in the browser (Status: Proposed, design only — no code). Captures the decision shape and trade-offs for running a read-only, non-voting learner replica inside the client, serving reads from a local in-browser
StateMachinewith no network round-trip.What it records
StateMachine→ serve reads locally. Strictly read-only/non-voting; writes still go through the leader. Read-your-writes via a session read-index token; optional client-side audit-chain verification.Indexed in
docs/adr/README.md. Builds on the deterministicStateMachineseam (ADR-0017), the log/audit chain (ADR-0009/0011), and follower reads (ADR-0014).🤖 Generated with Claude Code
Generated by Claude Code