Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

AzureExporter not working with multiprocessing

See original GitHub issue

Describe your environment. MacOS 10.14.6 Python 3.7.5 opencensus-ext-azure==1.0.4 opencensus-ext-requests==0.7.3

Steps to reproduce. I have code that I want to monitor the dependency calls to Azure DevOps APIs. Our code is running multiprocessing using the Process class. When the exporter is ran outside of multiprocessing, it sends telemetry to App Insights. When ran inside a multiprocessing Process, it doesn’t. I added a callback to print the spandata and it doesn’t get called when using Process.

from azure.devops.connection import Connection
from msrest.authentication import BasicAuthentication

from multiprocessing import Process, Pool, Queue
from base_insights import BaseInsights
from opencensus.common.runtime_context import RuntimeContext


class TestInsights:
    def __init__(self):
        self.tracer = BaseInsights.tracer

    def process(self):
       
        procs = []
        organization_url = 'https://dev.azure.com/org'
        credentials = BasicAuthentication('', '')
        
        p1 = Process(target=self.my_loop, args=[organization_url, credentials])
        p1.start()
        p1.join()

    def my_loop(self, organization_url, credentials, parent_span=None):
      
        with self.tracer.span(name='TestLoopProcessThreadingInside'):

            connection = Connection(base_url=organization_url, creds=credentials)
            core_client = connection.clients.get_core_client()

            org = core_client.get_project_collection("test")


TestInsights().process()

BaseInsights:

import os

from opencensus.ext.azure.trace_exporter import AzureExporter
from opencensus.trace import file_exporter

from opencensus.trace import config_integration
from opencensus.trace.samplers import ProbabilitySampler, AlwaysOnSampler
from opencensus.trace.tracer import Tracer

config_integration.trace_integrations(['requests'])


def singleton(cls):
    return cls()


@singleton
class BaseInsights:
    def __init__(self):
        exporter = AzureExporter()
        exporter.add_telemetry_processor(self.callback_function)

        self.tracer = Tracer(exporter=exporter, sampler=AlwaysOnSampler())


    def callback_function(self, envelope):
        print(envelope)

What is the expected behavior? Span data gets sent to Application Insights

What is the actual behavior? Span data is not sent to Application Insights