Module scheduler Roadmap

Scheduler Module Roadmap

Current Status

Production-capable scheduler runtime exists for task lifecycle operations, execution/listing/stats behavior, distributed and external coordination, and audit/result/anomaly/trigger observability surfaces.

In Progress

• [~] hardening concurrency-heavy registration/execution edge behavior (Target: Q3 2026)
• [~] improving coordination/adapter diagnostics consistency across incident classes (Target: Q3 2026)
• [~] stabilizing benchmark-backed release guardrails for scheduler hot paths (Target: Q3 2026)

Planned Features

Short-term (3-6 months)

• tighten deterministic behavior under sustained queue and burst workloads (Target: Q4 2026)
• expand stress coverage for trigger/anomaly and coordination edge scenarios (Target: Q4 2026)
• improve operator-facing diagnostics for task scheduling incident triage (Target: Q4 2026)

Mid-term (6-12 months)

• re-baseline p95/p99 envelopes for register/execute/list/stats paths (Target: Q1 2027)
• broaden benchmark depth for distributed and external scheduler integrations (Target: Q1 2027)
• harden long-run reliability under sustained scheduler traffic pressure (Target: Q1 2027)

Implementation Phases

Phase 1: Design / API Contract

• freeze scheduler lifecycle/execution/coordination contracts for current major line (Target: Q3 2026) — evidence: include/scheduler/scheduler_api_contract.h
• define explicit error taxonomy for scheduler failure classes (Target: Q3 2026) — evidence: include/scheduler/scheduler_api_contract.h

Phase 2: Core Implementation

• complete hardening for task scheduler and retention internals (Target: Q4 2026)
• align distributed/external integration behavior to bounded runtime contracts (Target: Q4 2026)

Phase 3: Error Handling and Edge Cases

• standardize fail-safe behavior for registration, execution, and coordination faults (Target: Q4 2026)
• unify diagnostics across scheduler lifecycle/coordination/observability incidents (Target: Q4 2026)

Phase 4: Tests

• expand focused regressions for concurrent register/execute and trigger edge scenarios (Target: Q4 2026) — evidence: tests/scheduler/test_scheduler_contract_hardening_focused.cpp
• extend deterministic stress fixtures for scheduler burst and retention workloads (Target: Q4 2026) — evidence: tests/scheduler/test_scheduler_contract_hardening_focused.cpp

Phase 5: Performance and Hardening

• lock benchmark-backed release gates for scheduler hot paths (Target: Q4 2026) — evidence: benchmarks/scheduler/bench_scheduler_release_gates.cpp
• validate p95/p99 and throughput behavior against release baselines (Target: Q4 2026) — evidence: benchmarks/scheduler/bench_scheduler_release_gates.cpp

Phase 6: Documentation and Acceptance

• core scheduler module docs aligned to source-verifiable behavior
• roadmap/future planning separated from historical changelog entries

Production Readiness Checklist

• core scheduler surfaces documented and source-verified
• module-level security and failure behavior documented
• benchmark mapping documented in performance expectations
• remaining hardening tasks closed for concurrency/coordination edge paths
• release benchmark stabilization complete

Known Issues and Limitations

• runtime behavior depends on workload shape and scheduler configuration.
• selected concurrency and integration edge scenarios need continued hardening.
• benchmark depth should continue expanding for advanced scheduler workflows.

Breaking Changes

No breaking scheduler contract planned. Any contract-breaking change requires migration notes and changelog entry before merge.

Program Execution Model — Wave Context

This module is a contributing module in the program-level Wave A → B → C → D execution model. It does not own a primary wave deliverable but must remain release_critical-green throughout all waves and must deliver Wave D operability improvements in Q1 2027. See [[../../ROADMAP.md|ROADMAP]] for the full wave model and exit criteria.

Wave D Contribution for scheduler

• Deliver or validate distributed tracing, high-cardinality stress coverage, exporter reliability, and operator remediation hints as applicable to this module (Target: Q1 2027)
• Contribute to or validate long-duration soak test coverage for this module's primary paths (Target: Q1 2027)
• Ensure runbook coverage for operator-critical scenarios in this module (Target: Q1 2027)

Cross-Wave Requirements

• release_critical CI must remain green on develop throughout all waves (Target: ongoing)
• p95/p99 benchmarks must be refreshed on representative hardware before Wave D sign-off (Target: Q1 2027)
• No behavioral regression may be introduced into modules in Wave A/B/C scope from changes in this module.

Program-Level Success Criteria (contribution)

• This module's distributed/acceleration paths fail closed (Target: Q1 2027)
• Benchmark-backed p95/p99 baselines exist on representative hardware (Target: Q1 2027)
• Operator-critical paths have diagnostics, alerts, and runbooks (Target: Q1 2027)