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How to set `PREFECT__LOGGING__LOG_ATTRIBUTES`? I a...
# ask-community
s
How to set 
PREFECT__LOGGING__LOG_ATTRIBUTES
? I am trying to send a unique id while creating a flow run using python client. I want this uuid to be available in logs for tracking the request flow. However, so far I haven't had any success in correctly setting the extra log attributes. This is how i start the docker agent:
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prefect agent start docker -e PREFECT__LOGGING__LOG_ATTRIBUTES="['uuid']"
I tried debugging and found that the log attributes are fetched as string here, instead of list.
c
Hi Sandeep - can you describe what error you are seeing? This worked for me:
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# start an ipython session with env vars
PREFECT__LOGGING__LOG_ATTRIBUTES="['uuid']" PREFECT__LOGGING__FORMAT="%(message)s | %(uuid)s" ipython
and then
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import prefect

logger = prefect.utilities.logging.get_logger()

with prefect.context(uuid="42"):
    logger.debug("hi")
I get:
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hi | 42
as I expect
s
Thanks for your reply @Chris White. Yes this works as expected when running locally. However, when using server with docker agent and dask cluster running on my local machine, I see a strange behaviour. I start agent with below command and also set prefect logging config in my worker environment variables, everything works fine.
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prefect agent start docker -v -f -e PREFECT__LOGGING__LOG_ATTRIBUTES="['uuid']" -e PREFECT__LOGGING__FORMAT="%(message)s | %(uuid)s" --network prefect_logging_default

# This is dask worker service in my compose file:
dask_worker:
    image: "daskdev/dask"
    command: dask-worker dask_scheduler:8786
    extra_hosts:
        - "host.docker.internal:172.17.0.1"
    environment:
        - PREFECT__LOGGING__LEVEL=DEBUG
        - PREFECT__LOGGING__LOG_ATTRIBUTES="['uuid']"
        - PREFECT__LOGGING__FORMAT="%(message)s | %(uuid)s"

# Agent output:
Beginning Flow run for 'logging-flow' | None
Starting flow run. | 42
Flow 'logging-flow': Handling state change from Scheduled to Running | 42
Flow run SUCCESS: all reference tasks succeeded | 42
Flow 'logging-flow': Handling state change from Running to Success | 42

# Worker output:
distributed.core - INFO - Starting established connection
Task 'log_with_attrs': Starting task run... | 42
Task 'log_with_attrs': Handling state change from Pending to Running | 42
Task 'log_with_attrs': Calling task.run() method... | 42
hi | 42
Task 'log_with_attrs': Handling state change from Running to Success | 42
Task 'log_with_attrs': finished task run for task with final state: 'Success' | 42
But when logging config is not passed to agent (The logging config is still set in worker environment though), below exception is raised. The flow still runs as expected.
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prefect agent start docker -v -f  --network prefect_logging_default

# This is dask worker service in my compose file:
dask_worker:
    image: "daskdev/dask"
    command: dask-worker dask_scheduler:8786
    extra_hosts:
        - "host.docker.internal:172.17.0.1"
    environment:
        - PREFECT__LOGGING__LEVEL=DEBUG
        - PREFECT__LOGGING__LOG_ATTRIBUTES="['uuid']"
        - PREFECT__LOGGING__FORMAT="%(message)s | %(uuid)s"

# Agent output:
[2020-06-29 02:53:18] INFO - prefect.CloudFlowRunner | Beginning Flow run for 'logging-flow'
[2020-06-29 02:53:18] INFO - prefect.CloudFlowRunner | Starting flow run.
[2020-06-29 02:53:18] DEBUG - prefect.CloudFlowRunner | Flow 'logging-flow': Handling state change from Scheduled to Running
[2020-06-29 02:53:18] INFO - prefect.CloudFlowRunner | Flow run SUCCESS: all reference tasks succeeded
[2020-06-29 02:53:18] DEBUG - prefect.CloudFlowRunner | Flow 'logging-flow': Handling state change from Running to Success

# Docker Worker logs
File "/usr/local/lib/python3.7/threading.py", line 926, in _bootstrap_inner
    self.run()
  File "/usr/local/lib/python3.7/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/local/lib/python3.7/site-packages/distributed/threadpoolexecutor.py", line 55, in _worker
    task.run()
  File "/usr/local/lib/python3.7/site-packages/distributed/_concurrent_futures_thread.py", line 65, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/usr/local/lib/python3.7/site-packages/distributed/worker.py", line 3419, in apply_function
    result = function(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/prefect/engine/flow_runner.py", line 696, in run_task
    context=context,
  File "/usr/local/lib/python3.7/site-packages/prefect/utilities/executors.py", line 257, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/prefect/engine/cloud/task_runner.py", line 315, in run
    is_mapped_parent=is_mapped_parent,
  File "/usr/local/lib/python3.7/site-packages/prefect/utilities/executors.py", line 257, in wrapper
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/prefect/engine/task_runner.py", line 291, in run
    state = self.get_task_run_state(state, inputs=task_inputs)
  File "/usr/local/lib/python3.7/site-packages/prefect/utilities/executors.py", line 66, in inner
    return runner_method(self, *args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/prefect/engine/runner.py", line 48, in inner
    new_state = method(self, state, *args, **kwargs)
  File "/usr/local/lib/python3.7/site-packages/prefect/engine/task_runner.py", line 822, in get_task_run_state
    self.task.run, timeout=self.task.timeout, **raw_inputs
  File "/usr/local/lib/python3.7/site-packages/prefect/utilities/executors.py", line 186, in timeout_handler
    return fn(*args, **kwargs)
  File "/home/sandeep/workspace/playground/prefect_logging/logging_flow.py", line 10, in log_with_attrs
Message: 'hi'
Arguments: ()
--- Logging error ---
Traceback (most recent call last):
  File "/usr/local/lib/python3.7/logging/__init__.py", line 1025, in emit
    msg = self.format(record)
  File "/usr/local/lib/python3.7/logging/__init__.py", line 869, in format
    return fmt.format(record)
  File "/usr/local/lib/python3.7/logging/__init__.py", line 611, in format
    s = self.formatMessage(record)
  File "/usr/local/lib/python3.7/logging/__init__.py", line 580, in formatMessage
    return self._style.format(record)
  File "/usr/local/lib/python3.7/logging/__init__.py", line 422, in format
    return self._fmt % record.__dict__
KeyError: 'uuid'
These are logs from UI's flow run -> logs tab, which doesn't show any errors.
logs.txt
c
Interesting OK; yea occasionally logging configuration is not properly passed on to dask workers so this sounds like a possible bug! I’ll open an issue for you and we can move this conversation there
@Marvin open “Adding logging attributes raises error when running on dask”
m
s
Great. Thanks @Chris White. I will follow the progress there.
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