[Bug] Worker hangs after polling error

[ndtretyak]

Describe the bug

Worker hangs after an error during polling.

Minimal Reproduction

I just start a worker with an incorrect token, so that my server responds with Request unauthorized..

import asyncio

from temporalio import activity, client, workflow, worker

@activity.defn
async def a() -> None:
    pass

@workflow.defn
class Workflow:
    @workflow.run
    async def run(self) -> None:
        pass

async def main():
    c = await client.Client.connect(
        "my_temporal_host:7233",
        rpc_metadata={"authorization": "wrong_token"},
        tls=True,
    )
    w = worker.Worker(
        c,
        task_queue="default",
        activities=[a],
        workflows=[Workflow],
    )
    await w.run()

if __name__ == "__main__":
    asyncio.run(main())

Output:

2024-01-10T14:27:15.726021Z  WARN temporal_sdk_core::worker::activities::activity_task_poller_stream: Error while polling for activity tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }
2024-01-10T14:27:15.726020Z  WARN temporal_sdk_core::worker::workflow::wft_poller: Error while polling for workflow tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }
2024-01-10T14:27:15.726316Z  WARN temporal_sdk_core::worker::workflow::wft_poller: Error while polling for workflow tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }
2024-01-10T14:27:15.726543Z  WARN temporal_sdk_core::worker::workflow::wft_poller: Error while polling for workflow tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }
2024-01-10T14:27:15.726584Z  WARN temporal_sdk_core::worker::workflow::wft_poller: Error while polling for workflow tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }
2024-01-10T14:27:15.727412Z  WARN temporal_sdk_core::worker::workflow::wft_poller: Error while polling for workflow tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }
2024-01-10T14:27:15.727472Z  WARN temporal_sdk_core::worker::workflow::workflow_stream: WFT poller errored, shutting down
2024-01-10T14:27:15.727490Z ERROR temporal_sdk_core::worker::workflow::workflow_stream: Workflow processing encountered fatal error and must shut down TonicError(Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None })
2024-01-10T14:27:15.728052Z  WARN temporal_sdk_core::worker::workflow::workflow_stream: WFT poller errored, shutting down
2024-01-10T14:27:15.728070Z ERROR temporal_sdk_core::worker::workflow::workflow_stream: Workflow processing encountered fatal error and must shut down TonicError(Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None })
2024-01-10T14:27:15.728168Z  WARN temporal_sdk_core::worker::workflow::workflow_stream: WFT poller errored, shutting down
2024-01-10T14:27:15.728475Z ERROR temporal_sdk_core::worker::workflow::workflow_stream: Workflow processing encountered fatal error and must shut down TonicError(Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None })
2024-01-10T14:27:15.728506Z  WARN temporal_sdk_core::worker::workflow::workflow_stream: WFT poller errored, shutting down
2024-01-10T14:27:15.728512Z ERROR temporal_sdk_core::worker::workflow::workflow_stream: Workflow processing encountered fatal error and must shut down TonicError(Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None })
2024-01-10T14:27:15.728945Z  WARN temporal_sdk_core::worker::workflow::workflow_stream: WFT poller errored, shutting down
2024-01-10T14:27:15.728958Z ERROR temporal_sdk_core::worker::workflow::workflow_stream: Workflow processing encountered fatal error and must shut down TonicError(Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None })
Worker failed, shutting down
Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/temporalio/worker/_activity.py", line 160, in run
    task = await poll_task
           ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/temporalio/bridge/worker.py", line 98, in poll_activity_task
    await self._ref.poll_activity_task()
RuntimeError: Poll failure: Unhandled grpc error when activity polling: Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.11/site-packages/temporalio/worker/_activity.py", line 180, in run
    raise RuntimeError("Activity worker failed") from err
RuntimeError: Activity worker failed
2024-01-10T14:27:15.729754Z  WARN temporal_sdk_core::worker::activities::activity_task_poller_stream: Error while polling for activity tasks error=Status { code: PermissionDenied, message: "Request unauthorized.", details: b"\x08\x07\x12\x15Request unauthorized.\x1aJ\nHtype.googleapis.com/temporal.api.errordetails.v1.PermissionDeniedFailure", metadata: MetadataMap { headers: {"content-type": "application/grpc"} }, source: None }

Then, the process just hangs forever.

Environment/Versions

• SDK Version: 1.5.0

[cretz]

Thanks for the report! The worker shutdown should succeed and the exception be thrown out of run() if those are the actual workflow and activities you're running. But if it's a more advanced activity that is not respecting cancellation, it's possible worker shutdown is not completing because it is cancelling activities but they are not respecting cancellation in some way. I will test with your above scenario and confirm.

[ndtretyak]

I don't actually run the activities. The authorization token is incorrect, so the worker cannot retrieve any tasks from the server.

[cretz]

I have replicated this with your code. I think this is actually in our Rust Core layer, so I have opened https://github.com/temporalio/sdk-core/issues/667.

[milani]

@cretz the ticket in rust sdk is resolved. does it mean this ticket is resolved and can be closed?

[cretz]

Yes, closing. This has not yet been made available in a released Python SDK version, but we hope to do another release soon.