chore(data-warehouse): Only execute one workflow at a time

posthog/temporal/common/worker.py

@@ -6,6 +6,7 @@
 from temporalio.runtime import PrometheusConfig, Runtime, TelemetryConfig
 from temporalio.worker import UnsandboxedWorkflowRunner, Worker
 
+from posthog.constants import DATA_WAREHOUSE_TASK_QUEUE_V2
 from posthog.temporal.common.client import connect
 from posthog.temporal.common.sentry import SentryInterceptor
 
@@ -34,18 +35,35 @@ async def start_worker(
         client_key,
         runtime=runtime,
     )
-    worker = Worker(
-        client,
-        task_queue=task_queue,
-        workflows=workflows,
-        activities=activities,
-        workflow_runner=UnsandboxedWorkflowRunner(),
-        graceful_shutdown_timeout=timedelta(minutes=5),
-        interceptors=[SentryInterceptor()],
-        activity_executor=ThreadPoolExecutor(max_workers=max_concurrent_activities or 50),
-        max_concurrent_activities=max_concurrent_activities or 50,
-        max_concurrent_workflow_tasks=max_concurrent_workflow_tasks,
-    )
+    if task_queue == DATA_WAREHOUSE_TASK_QUEUE_V2:
+        worker = Worker(
+            client,
+            task_queue=task_queue,
+            workflows=workflows,
+            activities=activities,
+            workflow_runner=UnsandboxedWorkflowRunner(),
+            graceful_shutdown_timeout=timedelta(minutes=5),
+            interceptors=[SentryInterceptor()],
+            activity_executor=ThreadPoolExecutor(max_workers=max_concurrent_activities or 50),
+            # Only run one workflow at a time
+            max_concurrent_activities=1,
+            max_concurrent_workflow_task_polls=1,
+            max_concurrent_workflow_tasks=1,
+            max_cached_workflows=0,
+        )
+    else:
+        worker = Worker(
+            client,
+            task_queue=task_queue,
+            workflows=workflows,
+            activities=activities,
+            workflow_runner=UnsandboxedWorkflowRunner(),
+            graceful_shutdown_timeout=timedelta(minutes=5),
+            interceptors=[SentryInterceptor()],
+            activity_executor=ThreadPoolExecutor(max_workers=max_concurrent_activities or 50),
+            max_concurrent_activities=max_concurrent_activities or 50,
+            max_concurrent_workflow_tasks=max_concurrent_workflow_tasks,
+        )
 
     # catch the TERM signal, and stop the worker gracefully
     # https://github.com/temporalio/sdk-python#worker-shutdown