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From "Paymahn Moghadasian (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AIRFLOW-2214) Import error when interpreting DAG with customer operator
Date Tue, 13 Mar 2018 20:17:00 GMT
Paymahn Moghadasian created AIRFLOW-2214:
--------------------------------------------

             Summary: Import error when interpreting DAG with customer operator
                 Key: AIRFLOW-2214
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-2214
             Project: Apache Airflow
          Issue Type: Bug
          Components: DAG, operators, plugins
    Affects Versions: 1.9.0
            Reporter: Paymahn Moghadasian


The [airflow docs|(https://airflow.apache.org/tutorial.html#testing] suggest that a basic
sanity check for a DAG file is to interpret it. ie:

{code:bash}
$ python ~/path/to/my/dag.py
{code}

I've found this to be useful. However, now I've created a plugin, `MordorOperator` under `$AIRFLOW_HOME/plugins`:

{code:python}
from airflow.plugins_manager import AirflowPlugin
from airflow.utils.decorators import apply_defaults
from airflow.operators import BaseOperator
from airflow.exceptions import AirflowException


class MordorOperator(BaseOperator):
    JOB_QUEUE_MAPPING = {"testing": "testing"}

    @apply_defaults
    def __init__(self, job, *args, **kwargs):
        super().__init__(*args, **kwargs)


    def execute(self, context):
        print("Executing mordoroperator")


class MordorPlugin(AirflowPlugin):
    name = "MordorPlugin"
    operators = [MordorOperator]
{code}

I can import the plugin and see it work in a sample DAG:

{code:python}
from airflow import DAG
from airflow.operators import MordorOperator
from datetime import datetime


dag = DAG('mordor_dag', description='DAG with a single task', start_date=datetime.today(),
catchup=False)

mordor = MordorOperator(job="testing", task_id='run_single_task', dag=dag)
{code}

However, when I try to interpret this file I get failures which I suspect I shouldn't get
since the plugin successfully runs. My suspicion is that this is because there's some dynamic
code gen happening at runtime which isn't available when a DAG is interpreted by itself. I
also find that PyCharm can't perform any autocompletion when importing the plugin.



{code:bash}
(venv)  3:54PM /Users/paymahn/solvvy/scheduler mordor.operator ✱
 ❮❮❮ python dags/mordor_test.py
section/key [core/airflow-home] not found in config
Traceback (most recent call last):
  File "dags/mordor_test.py", line 2, in <module>
    from airflow.operators import MordorOperator
ImportError: cannot import name 'MordorOperator'
{code}

How can a DAG using a plugin be sanity tested? Is there another mechanism to import the custom
operator which will allow interpreting the DAG from the commandline?



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