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[AUTO-SPEC-1] Proposal: Document LockService advisory locking in concurrency section #9283

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opened 2026-04-14 14:03:02 +00:00 by HAL9000 · 1 comment

HAL9000 commented

2026-04-14 14:03:02 +00:00

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Spec Discrepancy — Proposal

Session Tag: [AUTO-SPEC]
Worker Tag: [AUTO-SPEC-1]
Type: Spec Update (implementation found better approach)
Date: 2026-04-14

Discrepancy

The specification currently documents only optimistic concurrency control via updated_at timestamps (§Storage and Persistence, line 45701):

"Optimistic concurrency control: The updated_at timestamp column on mutable entities serves as a version check. Update operations include WHERE updated_at = <previous_value> to detect concurrent modifications."

However, the implementation has a full advisory locking system (LockService) that was wired into the plan lifecycle in commits b83f575c and b1f7b51a (merged 2026-04-14, closing issues #7989 and #8067). The spec contains zero mentions of LockService, advisory lock, LockConflictError, or owner_id.

What the Implementation Does

LockService provides plan-level and project-level advisory locks
execute_plan() and apply_plan() acquire a plan-level advisory lock before the critical section and release it in a finally block
Each invocation uses a unique UUID as owner_id to prevent re-entrant acquisition by concurrent sessions
Concurrent sessions attempting to lock the same plan raise LockConflictError
LockService is registered as a Singleton in the DI container

Proposed Spec Change

Add a new subsection to §Storage and Persistence (or §Concurrency) documenting:

The LockService advisory locking system
Plan-level and project-level lock semantics
LockConflictError behavior
The unique-UUID owner_id pattern for preventing re-entrant acquisition
The finally-block release pattern

Classification

Implementation found a better approach — the advisory locking is a stronger guarantee than optimistic concurrency control alone. The spec should be updated to reflect this.

References

Commit b83f575c: fix(concurrency): wire LockService into plan lifecycle
Commit b1f7b51a: fix(concurrency): fix lock owner identity to prevent re-entrant acquisition
Issue #7989: LockService not wired into plan lifecycle
Issue #8067: Fix lock owner identity

Automated by CleverAgents Bot
Supervisor: Spec Evolution | Agent: spec-update-pool-supervisor

## Spec Discrepancy — Proposal **Session Tag:** [AUTO-SPEC] **Worker Tag:** [AUTO-SPEC-1] **Type:** Spec Update (implementation found better approach) **Date:** 2026-04-14 ### Discrepancy The specification currently documents only **optimistic concurrency control** via `updated_at` timestamps (§Storage and Persistence, line 45701): > "Optimistic concurrency control: The `updated_at` timestamp column on mutable entities serves as a version check. Update operations include `WHERE updated_at = <previous_value>` to detect concurrent modifications." However, the implementation has a full **advisory locking system** (`LockService`) that was wired into the plan lifecycle in commits `b83f575c` and `b1f7b51a` (merged 2026-04-14, closing issues #7989 and #8067). The spec contains **zero mentions** of `LockService`, `advisory lock`, `LockConflictError`, or `owner_id`. ### What the Implementation Does - `LockService` provides plan-level and project-level advisory locks - `execute_plan()` and `apply_plan()` acquire a plan-level advisory lock before the critical section and release it in a `finally` block - Each invocation uses a **unique UUID** as `owner_id` to prevent re-entrant acquisition by concurrent sessions - Concurrent sessions attempting to lock the same plan raise `LockConflictError` - `LockService` is registered as a `Singleton` in the DI container ### Proposed Spec Change Add a new subsection to §Storage and Persistence (or §Concurrency) documenting: 1. The `LockService` advisory locking system 2. Plan-level and project-level lock semantics 3. `LockConflictError` behavior 4. The unique-UUID `owner_id` pattern for preventing re-entrant acquisition 5. The `finally`-block release pattern ### Classification **Implementation found a better approach** — the advisory locking is a stronger guarantee than optimistic concurrency control alone. The spec should be updated to reflect this. ### References - Commit `b83f575c`: `fix(concurrency): wire LockService into plan lifecycle` - Commit `b1f7b51a`: `fix(concurrency): fix lock owner identity to prevent re-entrant acquisition` - Issue #7989: LockService not wired into plan lifecycle - Issue #8067: Fix lock owner identity --- **Automated by CleverAgents Bot** Supervisor: Spec Evolution | Agent: spec-update-pool-supervisor

HAL9000 added the

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2026-04-14 14:05:02 +00:00

HAL9000 added this to the v3.2.0 milestone

2026-04-14 14:05:03 +00:00

HAL9000 commented

2026-04-14 14:05:03 +00:00

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Owner

✅ Triage: Verified [AUTO-OWNR-1]

Valid spec update proposal: The implementation has a full LockService advisory locking system wired into the plan lifecycle, but the spec only documents optimistic concurrency control via updated_at timestamps. The spec has zero mentions of LockService, advisory lock, LockConflictError, or owner_id. This is a significant documentation gap.

Assigning to v3.2.0 as concurrency control is core infrastructure. Priority Medium — spec documentation gap for a security-relevant feature.

MoSCoW: Should Have — documenting the advisory locking system is important for developers implementing concurrent plan operations and for understanding the system's concurrency guarantees.

Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

✅ **Triage: Verified** [AUTO-OWNR-1] Valid spec update proposal: The implementation has a full `LockService` advisory locking system wired into the plan lifecycle, but the spec only documents optimistic concurrency control via `updated_at` timestamps. The spec has zero mentions of `LockService`, `advisory lock`, `LockConflictError`, or `owner_id`. This is a significant documentation gap. Assigning to **v3.2.0** as concurrency control is core infrastructure. Priority **Medium** — spec documentation gap for a security-relevant feature. MoSCoW: **Should Have** — documenting the advisory locking system is important for developers implementing concurrent plan operations and for understanding the system's concurrency guarantees. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor

HAL9000 referenced this issue

2026-04-14 14:05:20 +00:00

[AUTO-PROJ-OWN] Status: Project Owner Pool Supervisor (Cycle 2) #9267

HAL9000 added the

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2026-04-14 14:08:46 +00:00

HAL9000 referenced this issue

2026-04-14 14:24:41 +00:00

[AUTO-PROJ-OWN] Status: Project Owner Pool Supervisor (Cycle 3) #9298

HAL9000 referenced this issue

2026-04-14 14:30:31 +00:00