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…oll loop Replace inline heartbeat logic in both TaskRunner and AsyncTaskRunner with a process-wide LeaseManager singleton. A background daemon thread checks for due heartbeats at ~1s intervals and dispatches them to a ThreadPoolExecutor(4), so heartbeat API calls and retries never block task polling. Key changes: - LeaseManager: singleton with background thread + thread pool, fork-safe via PID check, lazy start on first track() call - TaskRunner: delegates to LeaseManager.track/untrack instead of inline _send_due_heartbeats/_send_heartbeat methods - AsyncTaskRunner: same delegation; creates a sync TaskResourceApi for LeaseManager since heartbeats run in the thread pool, not the event loop - task_handler.py: clean — no LeaseManager knowledge needed - 21 unit tests covering track/untrack, heartbeat dispatch, retries, non-blocking behavior, singleton/fork safety, thread safety Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
Three tests against a live Conductor server: 1. Async task with heartbeat → COMPLETED (50s sleep, 10s timeout) 2. Async task without heartbeat → TIMED_OUT 3. Performance: heartbeat tracking adds 0ms overhead on fast tasks
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