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DashBoard/openspec/changes/archive/trace-async-job-queue/tasks.md
egg dbe0da057c feat(trace-pipeline): memory triage, async job queue, and NDJSON streaming 
Three proposals addressing the 2026-02-25 trace pipeline OOM crash (114K CIDs):

1. trace-events-memory-triage: fetchmany iterator (read_sql_df_slow_iter),
   admission control (50K CID limit for non-MSD), cache skip for large queries,
   early memory release with gc.collect()

2. trace-async-job-queue: RQ-based async jobs for queries >20K CIDs,
   separate worker process with isolated memory, frontend polling via
   useTraceProgress composable, systemd service + deploy scripts

3. trace-streaming-response: chunked Redis storage (TRACE_STREAM_BATCH_SIZE=5000),
   NDJSON stream endpoint (GET /api/trace/job/<id>/stream), frontend
   ReadableStream consumer for progressive rendering, backward-compatible
   with legacy single-key storage

All three proposals archived. 1101 tests pass, frontend builds clean.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-25 21:01:27 +08:00

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1. Dependencies

  • 1.1 Add rq>=1.16.0,<2.0.0 to requirements.txt
  • 1.2 Add rq>=1.16.0,<2.0.0 to pip dependencies in environment.yml

2. Trace Job Service

  • 2.1 Create src/mes_dashboard/services/trace_job_service.py with enqueue_trace_events_job(), get_job_status(), get_job_result()
  • 2.2 Implement execute_trace_events_job() function (RQ worker entry point): runs EventFetcher + optional MSD aggregation, stores result in Redis with TTL
  • 2.3 Add job metadata tracking: trace:job:{job_id}:meta Redis key with {profile, cid_count, domains, status, progress, created_at, completed_at}
  • 2.4 Add unit tests for trace_job_service (13 tests: enqueue, status, result, worker execution, flatten)

3. Async API Endpoints

  • 3.1 Modify events() in trace_routes.py: when len(container_ids) > TRACE_ASYNC_CID_THRESHOLD and async available, call enqueue_trace_events_job() and return HTTP 202
  • 3.2 Add GET /api/trace/job/<job_id> endpoint: return job status from get_job_status()
  • 3.3 Add GET /api/trace/job/<job_id>/result endpoint: return job result from get_job_result() with optional domain, offset, limit query params
  • 3.4 Add rate limiting to job status/result endpoints (60 req/60s)
  • 3.5 Add unit tests for async endpoints (8 tests: async routing, sync fallback, 413 fallback, job status/result)

4. Deployment

  • 4.1 Create deploy/mes-dashboard-trace-worker.service systemd unit (MemoryHigh=3G, MemoryMax=4G)
  • 4.2 Update scripts/start_server.sh: add start_rq_worker/stop_rq_worker/rq_worker_status functions
  • 4.3 Update scripts/deploy.sh: add trace worker systemd install instructions
  • 4.4 Update .env.example: uncomment and add TRACE_WORKER_ENABLED, TRACE_ASYNC_CID_THRESHOLD, TRACE_JOB_TTL_SECONDS, TRACE_JOB_TIMEOUT_SECONDS, TRACE_WORKER_COUNT, TRACE_WORKER_QUEUE

5. Frontend Integration

  • 5.1 Modify useTraceProgress.js: detect async response (eventsPayload.async === true), switch to job polling mode
  • 5.2 Add pollJobUntilComplete() helper: poll GET /api/trace/job/{job_id} every 3s, max 30 minutes
  • 5.3 Add job_progress reactive state for UI: { active, job_id, status, elapsed_seconds, progress }
  • 5.4 Add error handling: job failed (JOB_FAILED), polling timeout (JOB_POLL_TIMEOUT), abort support

6. Verification

  • 6.1 Run python -m pytest tests/ -v — 1090 passed, 152 skipped
  • 6.2 Run cd frontend && npm run build — frontend builds successfully
  • 6.3 Verify rq installed: python -c "import rq; print(rq.VERSION)" → 1.16.2