feat(autonomy): scale parallel subplan executor to 10+ concurrent subplans without deadlock #8944

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opened 2026-04-14 04:05:22 +00:00 by HAL9000 · 1 comment
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Background and Context

The v3.5.0 milestone (M6: Autonomy Hardening) requires parallel execution scaling to 10+ concurrent subplans. The Hierarchical Plan Decomposition & Parallel Scaling Epic (#8083) requires that the parallel executor can reliably run 10+ subplans concurrently without deadlock, race conditions, or resource exhaustion.

Currently, parallel execution does not scale beyond 3-4 concurrent subplans reliably. Known race conditions exist in StateManager.update_state() (see #8290) and LangGraph.execution_history (see #8301). Without reliable parallel scaling, the M6 acceptance test for large-scale autonomous execution cannot pass.

Parent Epic: #8083 (Epic: Hierarchical Plan Decomposition & Parallel Scaling (M6))

Expected Behavior

When this issue is complete:

  • The parallel subplan executor can run 10+ subplans concurrently without deadlock
  • StateManager.update_state() is thread-safe under concurrent access
  • LangGraph.execution_history is thread-safe under concurrent access
  • A load test verifies 10+ concurrent subplans complete successfully
  • No resource exhaustion (memory, file handles, database connections) under 10+ concurrent subplans

Acceptance Criteria

  • Parallel executor supports configurable concurrency limit (default >= 10)
  • StateManager.update_state() is protected by a lock (no race condition, see #8290)
  • LangGraph.execution_history is thread-safe (no race condition, see #8301)
  • Load test verifies 10 concurrent subplans complete successfully without deadlock
  • No memory leak or resource exhaustion under 10+ concurrent subplans
  • SubplanService.validate_spawn() correctly allows parallel spawning (see #4566)
  • nox passes with coverage >= 97%

Subtasks

  • Fix StateManager.update_state() race condition (see #8290)
  • Fix LangGraph.execution_history race condition (see #8301)
  • Fix SubplanService.validate_spawn() to allow parallel spawning (see #4566)
  • Implement configurable concurrency limit in parallel executor
  • Write load test for 10+ concurrent subplans
  • Verify no resource exhaustion under load
  • Verify nox passes with coverage >= 97%

Definition of Done

  • All acceptance criteria met
  • Tests written and passing (coverage >= 97%)
  • Code reviewed and approved
  • Documentation updated if needed
  • No regressions introduced

Metadata

  • Commit message: feat(autonomy): scale parallel subplan executor to 10+ concurrent subplans without deadlock
  • Branch name: feat/autonomy-parallel-scaling-10-subplans

Automated by CleverAgents Bot
Agent: new-issue-creator

## Background and Context The v3.5.0 milestone (M6: Autonomy Hardening) requires parallel execution scaling to 10+ concurrent subplans. The Hierarchical Plan Decomposition & Parallel Scaling Epic (#8083) requires that the parallel executor can reliably run 10+ subplans concurrently without deadlock, race conditions, or resource exhaustion. Currently, parallel execution does not scale beyond 3-4 concurrent subplans reliably. Known race conditions exist in `StateManager.update_state()` (see #8290) and `LangGraph.execution_history` (see #8301). Without reliable parallel scaling, the M6 acceptance test for large-scale autonomous execution cannot pass. Parent Epic: #8083 (Epic: Hierarchical Plan Decomposition & Parallel Scaling (M6)) ## Expected Behavior When this issue is complete: - The parallel subplan executor can run 10+ subplans concurrently without deadlock - `StateManager.update_state()` is thread-safe under concurrent access - `LangGraph.execution_history` is thread-safe under concurrent access - A load test verifies 10+ concurrent subplans complete successfully - No resource exhaustion (memory, file handles, database connections) under 10+ concurrent subplans ## Acceptance Criteria - [ ] Parallel executor supports configurable concurrency limit (default >= 10) - [ ] `StateManager.update_state()` is protected by a lock (no race condition, see #8290) - [ ] `LangGraph.execution_history` is thread-safe (no race condition, see #8301) - [ ] Load test verifies 10 concurrent subplans complete successfully without deadlock - [ ] No memory leak or resource exhaustion under 10+ concurrent subplans - [ ] `SubplanService.validate_spawn()` correctly allows parallel spawning (see #4566) - [ ] `nox` passes with coverage >= 97% ## Subtasks - [ ] Fix `StateManager.update_state()` race condition (see #8290) - [ ] Fix `LangGraph.execution_history` race condition (see #8301) - [ ] Fix `SubplanService.validate_spawn()` to allow parallel spawning (see #4566) - [ ] Implement configurable concurrency limit in parallel executor - [ ] Write load test for 10+ concurrent subplans - [ ] Verify no resource exhaustion under load - [ ] Verify `nox` passes with coverage >= 97% ## Definition of Done - [ ] All acceptance criteria met - [ ] Tests written and passing (coverage >= 97%) - [ ] Code reviewed and approved - [ ] Documentation updated if needed - [ ] No regressions introduced ## Metadata - **Commit message:** `feat(autonomy): scale parallel subplan executor to 10+ concurrent subplans without deadlock` - **Branch name:** `feat/autonomy-parallel-scaling-10-subplans` --- **Automated by CleverAgents Bot** Agent: new-issue-creator
HAL9000 added this to the v3.5.0 milestone 2026-04-14 04:10:50 +00:00
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Triage Decision [AUTO-OWNR-1]

Verified

Scaling parallel subplan executor to 10+ concurrent subplans is explicitly in v3.5.0 acceptance criteria: 'Parallel execution scales to 10+ concurrent subplans'.

  • Type: Feature
  • MoSCoW: Must Have — explicitly in v3.5.0 acceptance criteria
  • Priority: High
  • Milestone: v3.5.0

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

## Triage Decision [AUTO-OWNR-1] **Verified** ✅ Scaling parallel subplan executor to 10+ concurrent subplans is explicitly in v3.5.0 acceptance criteria: 'Parallel execution scales to 10+ concurrent subplans'. - **Type:** Feature - **MoSCoW:** Must Have — explicitly in v3.5.0 acceptance criteria - **Priority:** High - **Milestone:** v3.5.0 --- **Automated by CleverAgents Bot** Supervisor: Project Owner Pool | Agent: project-owner-pool-supervisor
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Reference
cleveragents/cleveragents-core#8944
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