[Python] skywalking [MainThread] [WARNING] fork() not currently supported with grpc protocol

[rysinal]

I refer to the Python Agent documentation to start my program via the start command sw-python -d run gunicorn myapp.wsgi , When I access the api I get an error:

skywalking [MainThread] [WARNING] fork() not currently supported with grpc protocol
skywalking [ReportThread] [ERROR] <_InactiveRpcError of RPC that terminated with:
        status = StatusCode.INTERNAL
        details = "Received RST_STREAM with error code 5"
        debug_error_string = "{"created":"@1644385809.129550000","description":"Error received from peer ipv4:172.23.76.178:11800","file":"src/core/lib/surface/call.cc","file_line":1075,"grpc_message":"Received RST_STREAM with error code 5","grpc_status":13}"
>
skywalking [SendProfileSnapShotThread] [ERROR] <_InactiveRpcError of RPC that terminated with:
        status = StatusCode.INTERNAL
        details = "Received RST_STREAM with error code 5"
        debug_error_string = "{"created":"@1644385809.837323000","description":"Error received from peer ipv4:172.23.76.178:11800","file":"src/core/lib/surface/call.cc","file_line":1075,"grpc_message":"Received RST_STREAM with error code 5","grpc_status":13}"

Instead, I was able to succeed with the following startup command

sw-python -d run python3 manage.py runserver

My sample code like this:

from django.http import HttpResponse

def index(request):
    return HttpResponse("Hello, world. You're at the sky index.")

my env:

Python 3.8.9
SkyWalking 8.8.1
gunicorn (version 20.1.0)

is it possible that gunicorn's startup method requires special settings to support skywalking? Please tell me how to use the gunicorn command to avoid this error，Thank you so much

[kezhenxu94]

As the error message says, [MainThread] [WARNING] fork() not currently supported with grpc protocol, your application is somewhat using fork process that is not supported in gRPC protocol, you need to switch to HTTP protocol.

[rysinal]

@kezhenxu94 Can you help me if you have time? tks

[kezhenxu94]

@kezhenxu94 Can you help me if you have time? tks

I didn't get notified when you edited an original comment, so please create a new comment if you have more to add, after you've replied for some time.

Looks like the exception of agent.start() is not printed, can you tried to add that exception into the log and see what's the exception?

https://github.com/apache/skywalking-python/blob/9b0f83d74f37650dcff6082ff2d738dd2aee49d9/skywalking/bootstrap/loader/sitecustomize.py#L147-L149

If you like you can open a pull request to add this, after exposing the exception we can investigate what's going on

[Superskyyy]

Yes, please change the line logger.error() to logger.exception(), then it should do the trick to output tracebacks.

[Superskyyy]

apache/skywalking-python#183 @rysinal Please try again from the latest master after this one merges, so we can together find out the root cause.

[rysinal]

apache/skywalking-python#183 @rysinal Please try again from the latest master after this one merges, so we can together find out the root cause.

Maybe because the computer rebooted, I can't reproduce it now, if I do I'll post the log to this page again, thanks for your answer