Module failover Future

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Failover Module - Future Enhancements

Scope

• hardening and refinement of failover/recovery runtime behavior
• expansion of deterministic reliability under dependency and queue pressure
• stronger benchmark-backed guardrails for recovery orchestration hot paths

Design Constraints

• failover/recovery contracts remain backward compatible within major release line.
• unsafe transition scenarios remain fail-closed and explicitly observable.
• queue/retry/dependency behavior remains bounded and diagnosable.
• recovery step transitions remain auditable.

Required Interfaces

Interface	Requirement
failover manager interface	deterministic queue/worker lifecycle behavior
recovery manager interface	explicit plan validation and ordered execution semantics
telemetry interface	bounded queue/retry/state observability

Implementation Notes

• tighten dependency/fencing edge behavior across failover and recovery workflows (Q4 2026).
• standardize diagnostics for queue saturation, retry escalation, and DR-step failures — partial delivery complete (Q3 2026), remaining scope in Q4 2026.
• expand resilience tests for repeated failover/recovery cycle pressure (Q4 2026).
• add dedicated failover-specific benchmarks to replace broad proxy reliance — FRG-01..FRG-06 delivered (Q3 2026); p95/p99 re-baseline planned Q1 2027.

Test Strategy

• unit and integration suites for failover queue and DR-step execution flows.
• regressions for invalid plans, unavailable dependencies, and timeout scenarios.
• deterministic stress runs for multi-node failover queue pressure.
• release-profile benchmark runs for mapped failover targets.

Performance Targets

• failover/recovery orchestration paths remain within regression budgets.
• queue/retry paths remain stable at p95/p99 envelopes.
• benchmark manifests for mapped failover targets reach no-missing-case status.

Security / Reliability

• maintain strict validation and guarded transitions for recovery actions.
• preserve explicit failure signaling for dependency-degraded states.
• enforce bounded queue and retry behavior under pressure.
• keep diagnostics actionable for production failover incidents.

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