fix: restore timeout and fix celery test infrastructure

- Re-add timeout=1.0 to ws_manager pubsub loop (prevents CPU spin)
- Use Redis for Celery tests (memory:// broker doesn't support chords)
- Add timeout param to in-memory subscriber mock
- Remove duplicate celery_includes fixture from rtc_ws tests

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Changelog
 
+## [0.28.0](https://github.com/Monadical-SAS/reflector/compare/v0.27.0...v0.28.0) (2026-01-20)
+
+
+### Features
+
+* worker affinity ([#819](https://github.com/Monadical-SAS/reflector/issues/819)) ([3b6540e](https://github.com/Monadical-SAS/reflector/commit/3b6540eae5b597449f98661bdf15483b77be3268))
+
 ## [0.27.0](https://github.com/Monadical-SAS/reflector/compare/v0.26.0...v0.27.0) (2025-12-26)
 
 

docker-compose.yml

@@ -34,7 +34,7 @@ services:
     environment:
       ENTRYPOINT: beat
 
-  hatchet-worker:
+  hatchet-worker-cpu:
     build:
       context: server
     volumes:
@@ -43,7 +43,20 @@ services:
     env_file:
       - ./server/.env
     environment:
-      ENTRYPOINT: hatchet-worker
+      ENTRYPOINT: hatchet-worker-cpu
+    depends_on:
+      hatchet:
+        condition: service_healthy
+  hatchet-worker-llm:
+    build:
+      context: server
+    volumes:
+      - ./server/:/app/
+      - /app/.venv
+    env_file:
+      - ./server/.env
+    environment:
+      ENTRYPOINT: hatchet-worker-llm
     depends_on:
       hatchet:
         condition: service_healthy

server/reflector/hatchet/run_workers.py

@@ -1,77 +0,0 @@
-"""
-Run Hatchet workers for the multitrack pipeline.
-Runs as a separate process, just like Celery workers.
-
-Usage:
-    uv run -m reflector.hatchet.run_workers
-
-    # Or via docker:
-    docker compose exec server uv run -m reflector.hatchet.run_workers
-"""
-
-import signal
-import sys
-
-from hatchet_sdk.rate_limit import RateLimitDuration
-
-from reflector.hatchet.constants import LLM_RATE_LIMIT_KEY, LLM_RATE_LIMIT_PER_SECOND
-from reflector.logger import logger
-from reflector.settings import settings
-
-
-def main() -> None:
-    """Start Hatchet worker polling."""
-    if not settings.HATCHET_ENABLED:
-        logger.error("HATCHET_ENABLED is False, not starting workers")
-        sys.exit(1)
-
-    if not settings.HATCHET_CLIENT_TOKEN:
-        logger.error("HATCHET_CLIENT_TOKEN is not set")
-        sys.exit(1)
-
-    logger.info(
-        "Starting Hatchet workers",
-        debug=settings.HATCHET_DEBUG,
-    )
-
-    # Import here (not top-level) - workflow modules call HatchetClientManager.get_client()
-    # at module level because Hatchet SDK decorators (@workflow.task) bind at import time.
-    # Can't use lazy init: decorators need the client object when function is defined.
-    from reflector.hatchet.client import HatchetClientManager  # noqa: PLC0415
-    from reflector.hatchet.workflows import (  # noqa: PLC0415
-        daily_multitrack_pipeline,
-        subject_workflow,
-        topic_chunk_workflow,
-        track_workflow,
-    )
-
-    hatchet = HatchetClientManager.get_client()
-
-    hatchet.rate_limits.put(
-        LLM_RATE_LIMIT_KEY, LLM_RATE_LIMIT_PER_SECOND, RateLimitDuration.SECOND
-    )
-
-    worker = hatchet.worker(
-        "reflector-pipeline-worker",
-        workflows=[
-            daily_multitrack_pipeline,
-            subject_workflow,
-            topic_chunk_workflow,
-            track_workflow,
-        ],
-    )
-
-    def shutdown_handler(signum: int, frame) -> None:
-        logger.info("Received shutdown signal, stopping workers...")
-        # Worker cleanup happens automatically on exit
-        sys.exit(0)
-
-    signal.signal(signal.SIGINT, shutdown_handler)
-    signal.signal(signal.SIGTERM, shutdown_handler)
-
-    logger.info("Starting Hatchet worker polling...")
-    worker.start()
-
-
-if __name__ == "__main__":
-    main()

server/reflector/hatchet/run_workers_cpu.py

@@ -0,0 +1,48 @@
+"""
+CPU-heavy worker pool for audio processing tasks.
+Handles ONLY: mixdown_tracks
+
+Configuration:
+- slots=1: Only mixdown (already serialized globally with max_runs=1)
+- Worker affinity: pool=cpu-heavy
+"""
+
+from reflector.hatchet.client import HatchetClientManager
+from reflector.hatchet.workflows.daily_multitrack_pipeline import (
+    daily_multitrack_pipeline,
+)
+from reflector.logger import logger
+from reflector.settings import settings
+
+
+def main():
+    if not settings.HATCHET_ENABLED:
+        logger.error("HATCHET_ENABLED is False, not starting CPU workers")
+        return
+
+    hatchet = HatchetClientManager.get_client()
+
+    logger.info(
+        "Starting Hatchet CPU worker pool (mixdown only)",
+        worker_name="cpu-worker-pool",
+        slots=1,
+        labels={"pool": "cpu-heavy"},
+    )
+
+    cpu_worker = hatchet.worker(
+        "cpu-worker-pool",
+        slots=1,  # Only 1 mixdown at a time (already serialized globally)
+        labels={
+            "pool": "cpu-heavy",
+        },
+        workflows=[daily_multitrack_pipeline],
+    )
+
+    try:
+        cpu_worker.start()
+    except KeyboardInterrupt:
+        logger.info("Received shutdown signal, stopping CPU workers...")
+
+
+if __name__ == "__main__":
+    main()

server/reflector/hatchet/run_workers_llm.py

@@ -0,0 +1,56 @@
+"""
+LLM/I/O worker pool for all non-CPU tasks.
+Handles: all tasks except mixdown_tracks (transcription, LLM inference, orchestration)
+"""
+
+from reflector.hatchet.client import HatchetClientManager
+from reflector.hatchet.workflows.daily_multitrack_pipeline import (
+    daily_multitrack_pipeline,
+)
+from reflector.hatchet.workflows.subject_processing import subject_workflow
+from reflector.hatchet.workflows.topic_chunk_processing import topic_chunk_workflow
+from reflector.hatchet.workflows.track_processing import track_workflow
+from reflector.logger import logger
+from reflector.settings import settings
+
+SLOTS = 10
+WORKER_NAME = "llm-worker-pool"
+POOL = "llm-io"
+
+
+def main():
+    if not settings.HATCHET_ENABLED:
+        logger.error("HATCHET_ENABLED is False, not starting LLM workers")
+        return
+
+    hatchet = HatchetClientManager.get_client()
+
+    logger.info(
+        "Starting Hatchet LLM worker pool (all tasks except mixdown)",
+        worker_name=WORKER_NAME,
+        slots=SLOTS,
+        labels={"pool": POOL},
+    )
+
+    llm_worker = hatchet.worker(
+        WORKER_NAME,
+        slots=SLOTS,  # not all slots are probably used
+        labels={
+            "pool": POOL,
+        },
+        workflows=[
+            daily_multitrack_pipeline,
+            topic_chunk_workflow,
+            subject_workflow,
+            track_workflow,
+        ],
+    )
+
+    try:
+        llm_worker.start()
+    except KeyboardInterrupt:
+        logger.info("Received shutdown signal, stopping LLM workers...")
+
+
+if __name__ == "__main__":
+    main()

server/reflector/hatchet/workflows/daily_multitrack_pipeline.py

@@ -23,7 +23,12 @@ from pathlib import Path
 from typing import Any, Callable, Coroutine, Protocol, TypeVar
 
 import httpx
-from hatchet_sdk import Context
+from hatchet_sdk import (
+    ConcurrencyExpression,
+    ConcurrencyLimitStrategy,
+    Context,
+)
+from hatchet_sdk.labels import DesiredWorkerLabel
 from pydantic import BaseModel
 
 from reflector.dailyco_api.client import DailyApiClient
@@ -467,6 +472,20 @@ async def process_tracks(input: PipelineInput, ctx: Context) -> ProcessTracksRes
     parents=[process_tracks],
     execution_timeout=timedelta(seconds=TIMEOUT_AUDIO),
     retries=3,
+    desired_worker_labels={
+        "pool": DesiredWorkerLabel(
+            value="cpu-heavy",
+            required=True,
+            weight=100,
+        ),
+    },
+    concurrency=[
+        ConcurrencyExpression(
+            expression="'mixdown-global'",
+            max_runs=1,  # serialize mixdown to prevent resource contention
+            limit_strategy=ConcurrencyLimitStrategy.GROUP_ROUND_ROBIN,  # Queue
+        )
+    ],
 )
 @with_error_handling(TaskName.MIXDOWN_TRACKS)
 async def mixdown_tracks(input: PipelineInput, ctx: Context) -> MixdownResult:

server/reflector/hatchet/workflows/topic_chunk_processing.py

@@ -7,7 +7,11 @@ Spawned dynamically by detect_topics via aio_run_many() for parallel processing.
 
 from datetime import timedelta
 
-from hatchet_sdk import ConcurrencyExpression, ConcurrencyLimitStrategy, Context
+from hatchet_sdk import (
+    ConcurrencyExpression,
+    ConcurrencyLimitStrategy,
+    Context,
+)
 from hatchet_sdk.rate_limit import RateLimit
 from pydantic import BaseModel
 
@@ -34,11 +38,13 @@ hatchet = HatchetClientManager.get_client()
 topic_chunk_workflow = hatchet.workflow(
     name="TopicChunkProcessing",
     input_validator=TopicChunkInput,
-    concurrency=ConcurrencyExpression(
+    concurrency=[
-        expression="'global'",  # constant string = global limit across all runs
+        ConcurrencyExpression(
-        max_runs=20,
+            expression="'global'",  # constant string = global limit across all runs
-        limit_strategy=ConcurrencyLimitStrategy.GROUP_ROUND_ROBIN,
+            max_runs=20,
-    ),
+            limit_strategy=ConcurrencyLimitStrategy.GROUP_ROUND_ROBIN,
+        )
+    ],
 )
 
 

server/reflector/ws_manager.py

@@ -11,7 +11,6 @@ broadcast messages to all connected websockets.
 
 import asyncio
 import json
-import threading
 
 import redis.asyncio as redis
 from fastapi import WebSocket
@@ -98,8 +97,10 @@ class WebsocketManager:
 
     async def _pubsub_data_reader(self, pubsub_subscriber):
         while True:
+            # timeout=1.0 prevents tight CPU loop when no messages available
             message = await pubsub_subscriber.get_message(
-                ignore_subscribe_messages=True
+                ignore_subscribe_messages=True,
+                timeout=1.0,
             )
             if message is not None:
                 room_id = message["channel"].decode("utf-8")
@@ -109,29 +110,38 @@ class WebsocketManager:
                     await socket.send_json(data)
 
 
+# Process-global singleton to ensure only one WebsocketManager instance exists.
+# Multiple instances would cause resource leaks and CPU issues.
+_ws_manager: WebsocketManager | None = None
+
+
 def get_ws_manager() -> WebsocketManager:
     """
-    Returns the WebsocketManager instance for managing websockets.
+    Returns the global WebsocketManager singleton.
 
-    This function initializes and returns the WebsocketManager instance,
+    Creates instance on first call, subsequent calls return cached instance.
-    which is responsible for managing websockets and handling websocket
+    Thread-safe via GIL. Concurrent initialization may create duplicate
-    connections.
+    instances but last write wins (acceptable for this use case).
 
     Returns:
-        WebsocketManager: The initialized WebsocketManager instance.
+        WebsocketManager: The global WebsocketManager instance.
-
-    Raises:
-        ImportError: If the 'reflector.settings' module cannot be imported.
-        RedisConnectionError: If there is an error connecting to the Redis server.
     """
-    local = threading.local()
+    global _ws_manager
-    if hasattr(local, "ws_manager"):
-        return local.ws_manager
 
+    if _ws_manager is not None:
+        return _ws_manager
+
+    # No lock needed - GIL makes this safe enough
+    # Worst case: race creates two instances, last assignment wins
     pubsub_client = RedisPubSubManager(
         host=settings.REDIS_HOST,
         port=settings.REDIS_PORT,
     )
-    ws_manager = WebsocketManager(pubsub_client=pubsub_client)
+    _ws_manager = WebsocketManager(pubsub_client=pubsub_client)
-    local.ws_manager = ws_manager
+    return _ws_manager
-    return ws_manager
+
+
+def reset_ws_manager() -> None:
+    """Reset singleton for testing. DO NOT use in production."""
+    global _ws_manager
+    _ws_manager = None

server/runserver.sh

@@ -7,8 +7,10 @@ elif [ "${ENTRYPOINT}" = "worker" ]; then
     uv run celery -A reflector.worker.app worker --loglevel=info
 elif [ "${ENTRYPOINT}" = "beat" ]; then
     uv run celery -A reflector.worker.app beat --loglevel=info
-elif [ "${ENTRYPOINT}" = "hatchet-worker" ]; then
+elif [ "${ENTRYPOINT}" = "hatchet-worker-cpu" ]; then
-    uv run python -m reflector.hatchet.run_workers
+    uv run python -m reflector.hatchet.run_workers_cpu
+elif [ "${ENTRYPOINT}" = "hatchet-worker-llm" ]; then
+    uv run python -m reflector.hatchet.run_workers_llm
 else
     echo "Unknown command"
 fi

server/tests/conftest.py

@@ -1,6 +1,5 @@
 import os
 from contextlib import asynccontextmanager
-from tempfile import NamedTemporaryFile
 from unittest.mock import patch
 
 import pytest
@@ -333,11 +332,18 @@ def celery_enable_logging():
 
 @pytest.fixture(scope="session")
 def celery_config():
-    with NamedTemporaryFile() as f:
+    # Use Redis for chord/group task execution (memory:// broker doesn't support chords)
-        yield {
+    # Redis must be running - start with: docker compose up -d redis
-            "broker_url": "memory://",
+    import os
-            "result_backend": f"db+sqlite:///{f.name}",
+
-        }
+    redis_host = os.environ.get("REDIS_HOST", "localhost")
+    redis_port = os.environ.get("REDIS_PORT", "6379")
+    # Use db 2 to avoid conflicts with main app
+    redis_url = f"redis://{redis_host}:{redis_port}/2"
+    yield {
+        "broker_url": redis_url,
+        "result_backend": redis_url,
+    }
 
 
 @pytest.fixture(scope="session")
@@ -370,9 +376,12 @@ async def ws_manager_in_memory(monkeypatch):
         def __init__(self, queue: asyncio.Queue):
             self.queue = queue
 
-        async def get_message(self, ignore_subscribe_messages: bool = True):
+        async def get_message(
+            self, ignore_subscribe_messages: bool = True, timeout: float | None = None
+        ):
+            wait_timeout = timeout if timeout is not None else 0.05
             try:
-                return await asyncio.wait_for(self.queue.get(), timeout=0.05)
+                return await asyncio.wait_for(self.queue.get(), timeout=wait_timeout)
             except Exception:
                 return None
 

server/tests/test_transcripts_rtc_ws.py

@@ -115,9 +115,7 @@ def appserver(tmpdir, setup_database, celery_session_app, celery_session_worker)
     settings.DATA_DIR = DATA_DIR
 
 
-@pytest.fixture(scope="session")
+# Using celery_includes from conftest.py which includes both pipelines
-def celery_includes():
-    return ["reflector.pipelines.main_live_pipeline"]
 
 
 @pytest.mark.usefixtures("setup_database")

server/tests/test_user_websocket_auth.py

@@ -56,7 +56,12 @@ def appserver_ws_user(setup_database):
 
     if server_instance:
         server_instance.should_exit = True
-        server_thread.join(timeout=30)
+        server_thread.join(timeout=2.0)
+
+    # Reset global singleton for test isolation
+    from reflector.ws_manager import reset_ws_manager
+
+    reset_ws_manager()
 
 
 @pytest.fixture(autouse=True)
@@ -133,6 +138,11 @@ async def test_user_ws_accepts_valid_token_and_receives_events(appserver_ws_user
 
     # Connect and then trigger an event via HTTP create
     async with aconnect_ws(base_ws, subprotocols=subprotocols) as ws:
+        # Give Redis pubsub time to establish subscription before publishing
+        import asyncio
+
+        await asyncio.sleep(0.2)
+
         # Emit an event to the user's room via a standard HTTP action
         from httpx import AsyncClient
 
@@ -150,6 +160,7 @@ async def test_user_ws_accepts_valid_token_and_receives_events(appserver_ws_user
             "email": "user-abc@example.com",
         }
 
+        # Use in-memory client (global singleton makes it share ws_manager)
         async with AsyncClient(app=app, base_url=f"http://{host}:{port}/v1") as ac:
             # Create a transcript as this user so that the server publishes TRANSCRIPT_CREATED to user room
             resp = await ac.post("/transcripts", json={"name": "WS Test"})

server/uv.lock

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