Hey guys, Im having this error while trying to deploy a script

Beginning health checks...

System Version check: OK

Traceback (most recent call last):

File "/opt/prefect/healthcheck.py", line 151, in <module>

flows = cloudpickle_deserialization_check(flow_file_paths)

File "/opt/prefect/healthcheck.py", line 44, in cloudpickle_deserialization_check

flows.append(cloudpickle.loads(flow_bytes))

File "/usr/local/lib/python3.8/site-packages/cloudpickle/cloudpickle.py", line 562, in subimport

__import__(name)

ModuleNotFoundError: No module named 'gcloud'

has anyone had it and managed to fix it somehow?

Hi! We are shipping our Kubernetes Run logs to Datadog. Datadog (as well as most log aggregators) prefers logs in JSON format. What is the best way to get Prefect logs formatted in JSON?

Hi always get that error with the package, but installed it several times. thanks for helping me!

[2021-03-01 18:24:40+0100] ERROR - prefect.FlowRunner | Unexpected error: ModuleNotFoundError("No module named 'oauthlib'")
Traceback (most recent call last):
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\prefect\engine\runner.py", line 48, in inner
    new_state = method(self, state, *args, **kwargs)
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\prefect\engine\flow_runner.py", line 619, in get_flow_run_state
    final_states = executor.wait(
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\prefect\executors\dask.py", line 397, in wait
    return self.client.gather(futures)
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\distributed\client.py", line 1993, in gather
    return self.sync(
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\distributed\client.py", line 839, in sync
    return sync(
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\distributed\utils.py", line 340, in sync
    raise exc.with_traceback(tb)
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\distributed\utils.py", line 324, in f
    result[0] = yield future
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\tornado\gen.py", line 762, in run
    value = future.result()
  File "C:\Users\laura.vaida.000\anaconda3\envs\prefect\lib\site-packages\distributed\client.py", line 1858, in _gather
    raise exception.with_traceback(traceback)
  File "/opt/conda/lib/python3.8/site-packages/distributed/protocol/pickle.py", line 75, in loads
ModuleNotFoundError: No module named 'oauthlib'
[2021-03-01 18:24:40+0100] ERROR - prefect.billwerk-contracts | Unexpected error occured in FlowRunner: ModuleNotFoundError("No module named 'oauthlib'")

Hi folks, is there a way to trigger a flow B to run if flow A fails, without having a “meta” flow C that waits on flow A to finish ?

Probably a basic question, but I’m wondering how people organise their flow codes? I’m processing a whole heap of text files. Some use the exact same flow and tasks, whilst others have their own peculiarities. Do you generally have a

tasks.py

file with all your task functions? A

.py

with a

Flow

for each file you process? Interested to see how others work this.

Hi! Not sure what the best/right channel for support requests is, so I'll try here. • Problem: Flow that has worked previously suddenly stopped working yesterday • Setup: Orchestration with Prefect Cloud, agent running on AWS EC2 instance (agent process hosted with forever) • Done so far: ◦ Restarted the agent, last agent log line is "[2021-03-02 113718,922] INFO - agent | Waiting for flow runs..." ◦ Restarted the flow run in Prefect Cloud, but no logs are being generated (picture attached) This is production stuff and related to month change process, so any pointers are highly appreciated... EDIT: After agent restart, the agent status was green for about 15 minutes, but now turned red.

Hi prefect experts, How many local agents can run parallel in a machine? any limit on this in prefect.io

Hello Prefect! I have a question about variables defined in the config.toml file. Can you confirm that when registering a flow any variables defined in config.toml are “uploaded” to Prefect Cloud as part of the registration process? For example when instantiating classes with config.toml configuration: refresh_mv = PostgresExecute(name=“Refresh MV”, host=prefect.config.postgres.host, db_name=prefect.config.postgres.db_name, user=prefect.config.postgres.user) I expected to need to define those configuration variables as environment variables in the execution rutime but did not. Thanks in advance! rb

Hi team, I have registered flow using the below code

with Flow("Test run", run_config=DockerRun(labels=["dev"])) as flow:
            flow.add_task(say_hello())
        flow.register("Test")
@task
def say_hello():
    print("Hello, world!")

When I run the flow from UI, I got the below error Failed to load and execute Flow's environment: AttributeError("'NoneType' object has no attribute 'rstrip'") Can anyone has faced such issue or help me in right direction?

hi folks, im getting this error when kicking of a registered flow from the ui, but have claimed that as dependency:

#define executor as dask executor with tcp from load balancer
flow.executor = DaskExecutor(address="35.198.104.230:8786") # tcp:port address of dask load balancer
flow.storage = Docker(registry_url="<http://gcr.io/keller-steering-enabling/flows|gcr.io/keller-steering-enabling/flows>", image_name="billwerk-contracts",python_dependencies=["pandas", "oauthlib ", "requests", "requests_oauthlib", "datetime", "oauth2client", "snowflake"])
flow.run_config = KubernetesRun()
flow.register('Billwerk')

Hi all! I have some flows that continue to run in Prefect Cloud even though I have the flow schedule turned off on the UI. Has anyone encountered this before?

Does flow.run() needs a local prefect agent ?

Hello everyone. Is there a way to customize the final message of the flow ? Currently it only says

====== final results: <Success: "All reference tasks succeeded.">
or 
====== final results: <Failed: "Some reference tasks failed.">

We have different types of successes/failures. Currently we could not differentiate them from the flow hook notification message. We would like to set customized messages to different scenarios and react differently. for example

====== final results: <Failed: "Task_A failed due to timeout.">

hi folks, what is the best way to pass results from one task to another? making a cache?

hey everyone - my cloud account is broken (see pic below). Who should I contact to get the account restored?

how to store the gcp credentials in the ui? the whole json or certain aspects of that?ß

I’m curious if other folks are running into this. Using a KubernetesRun run config and Docker storage for our flows, we almost always need to manually bump the Docker

image_tag

to a new version in order for K8s to pick up the new image. Does anyone have a more automated way of doing this? It’s not uncommon for someone to forget to make that change and leads to confusion about what’s running in prod.

Hi - I have a

flow

that runs successfully with a

LocalExecutor

. However when the

flow

is run using

flow.executor = DaskExecutor()

the flow returns a

Failed to deserialize

error on the final

task

.

[2021-03-03 08:27:24-0600] INFO - prefect.TaskRunner | Task 'new-terms': Finished task run for task with final state: 'Success'
INFO:prefect.TaskRunner:Task 'new-terms': Finished task run for task with final state: 'Success'
distributed.protocol.core - CRITICAL - Failed to deserialize
Traceback (most recent call last):
  File "miniconda3/envs/py38lmap/lib/python3.8/site-packages/distributed/protocol/core.py", line 151, in loads
    value = _deserialize(head, fs, deserializers=deserializers)
  File "miniconda3/envs/py38lmap/lib/python3.8/site-packages/distributed/protocol/serialize.py", line 374, in deserialize
    return loads(header, frames)
  File "/home/ilivni/miniconda3/envs/py38lmap/lib/python3.8/site-packages/distributed/protocol/serialize.py", line 70, in pickle_loads
    return pickle.loads(x, buffers=buffers)
  File "miniconda3/envs/py38lmap/lib/python3.8/site-packages/distributed/protocol/pickle.py", line 75, in loads
    return pickle.loads(x)
  File "miniconda3/envs/py38lmap/lib/python3.8/site-packages/tblib/pickling_support.py", line 26, in unpickle_exception
    inst = func(*args)
TypeError: __init__() missing 1 required positional argument: 'request'

The last task is a

FilterTask

filter_res = FilterTask()

res = filter_res(
            keywords,
            task_args={
                "name": "new-terms"
                }
            )

Any suggestions?

hi, what is that pointing at?

Unexpected error: TypeError("'NoneType' object is not subscriptable")

hi all – I'm trying to get an ECS Agent to launch a task that i've preregistered with ECS (and i'm just passing in the

task_definition_arn

to the run configs), but I'm currently getting this error:

An error occurred (InvalidParameterException) when calling the RunTask operation: Override for container named flow is not a container in the TaskDefinition.

does this mean that my pre-registered task needs to have a container named

flow

?

Hi, here's yet another license question:

Prefect Core is licensed under the Apache Software License Version 2.0. Please note that Prefect Core includes utilities for running Prefect Server and the Prefect UI, which are themselves licensed under the Prefect Community License.

• Is there a clearer documentation on what's under PCL vs Apache 2.0?

Prefect Core includes utilities for running Prefect Server and the Prefect UI

• are these referring to the CLI wrapper around docker-compose (https://github.com/PrefectHQ/prefect/tree/master/src/prefect/cli)? • in other words, if I write my own docker-compose to deploy Prefect Core in my environment, the entire architecutre should be under Apache 2.0?

Is there a way to set the max_workers and max_deployed_flows for a single Agent? I can see the max_workers is hardcoded here. Is it possible to add a max_workers argument to the base Agent class? I believe we would only need to change this one line. In a number of cases, I would like to limit the number of threads (workers) the Agent is using. And for max_deployed_flows to an Agent, it looks like Agents grab all flows that are ready by default, shown here. It would be useful to add a graphql "limit" tag to this mutation to ensure one Agent isn't "hogging" flow runs when another (with equivalent Labels) is open and ready for them. I'm not sure if this is possible in a mutation though and may be trickier to change.

How does one increase flow concurrency in prefect cloud? I am currently limited to 2.

I feel like am so close to getting my ECS Task to run w/ the ECS Agent, but I'm having an odd issue where my flow that's calling this task is just hanging forever in a scheduled/pending state – I can see in the AWS console that the ECS task is being run, and prefect is indeed passing a lot of ENV variables to the container that's getting spun up, but nonetheless my flow is always stuck in a "Submitted" state and I'm not seeing any logs in the Cloud UI

Hi, new here but have been using prefect in anger for a couple of weeks and loving it

Can some one tell me why my flow is getting picked up by 2 agents?

Another issue I came across is when you combine nout > 1 and .map: The multiple return values from the nout>1 task are not iterated correctly when passed as args to the next task

from typing import Tuple

from prefect import Flow, Task, task


@task(nout=2)
def step1(num) -> Tuple[int, str]:
    chars = ['a','b','c']
    return num, chars[num - 1]

@task
def step2(arg1, arg2):
    print(f"arg1={arg1} arg2={arg2}")

def unzip(nout: int) -> Task:
    @task(nout=nout)
    def _unzip(res) -> tuple:
        return tuple(zip(*res))
    return _unzip


with Flow("nout test") as flow:
    numbers = [1, 2, 3]
    # bad
    a, b = step1.map(num=numbers)
    step2.map(arg1=a, arg2=b)
    # prints:
    # arg1=1 arg2=2
    # arg1=a arg2=b

    # good - with unzip workaround
    c, d = unzip(2)(step1.map(num=numbers))
    step2.map(arg1=c, arg2=d)
    # prints:
    # arg1=1 arg2=a
    # arg1=2 arg2=b
    # arg1=3 arg2=c


if __name__ == "__main__":
    flow.run()

Hi team! Is there an easy way (preferably in the UI) to cancel all running flows (anything in the blue state)?

Good morning, I have a question about flow registration. I'd like to register my flows during CI/CD (specifically, AWS Codebuild). My issue is that I have run into import errors, because my flow dependencies are not installed in the build environment. I am using

S3Storage

and

KubernetesRun

. Thanks in advance for any guidance.