[jira] [Created] (AIRFLOW-1717) AttributeError while clicking on dag on webUI

["Ambrish Bhargava (JIRA)" <ji...@apache.org>]

Ambrish Bhargava created AIRFLOW-1717:
-----------------------------------------

             Summary: AttributeError while clicking on dag on webUI
                 Key: AIRFLOW-1717
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1717
             Project: Apache Airflow
          Issue Type: Bug
          Components: ui
    Affects Versions: Airflow 1.8
            Reporter: Ambrish Bhargava


Simple DAG
{code}from airflow import DAG
from airflow.contrib.operators.qubole_operator import QuboleOperator
from datetime import datetime, timedelta
 
# Default args
default_args = {
    'owner': 'airflow',
    'depends_on_past': False,
    'start_date': datetime(2017, 8, 1),
    'email': ['airflow@airflow.com'],
    'email_on_failure': True,
    'email_on_retry': False,
    'retries': 1,
    'retry_delay': timedelta(minutes=5),
}
 
# Dag information
dag = DAG(
    'qubole_test',
    default_args=default_args,
    schedule_interval='@daily')
 
# Actual steps
hive_cmd = QuboleOperator(
    command_type='hivecmd',
    task_id='qubole_show_tables',
    query='use schema;show tables;',
    cluster_label='default',
    qubole_conn_id = 'airflow_qubole',
    dag=dag){code}

When I ran this dag on CLI, it worked fine. But when I tried to click the DAG on web UI, I am getting following error:

{code}Traceback (most recent call last):
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1988, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1641, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1544, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1639, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib64/python2.7/site-packages/flask/app.py", line 1625, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/local/lib/python2.7/site-packages/flask_admin/base.py", line 69, in inner
    return self._run_view(f, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/flask_admin/base.py", line 368, in _run_view
    return fn(self, *args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/flask_login.py", line 755, in decorated_view
    return func(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/airflow/www/utils.py", line 219, in view_func
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/airflow/www/utils.py", line 125, in wrapper
    return f(*args, **kwargs)
  File "/usr/local/lib/python2.7/site-packages/airflow/www/views.py", line 1229, in tree
    'children': [recurse_nodes(t, set()) for t in dag.roots],
  File "/usr/local/lib/python2.7/site-packages/airflow/www/views.py", line 1191, in recurse_nodes
    if node_count[0] < node_limit or t not in visited]
  File "/usr/local/lib/python2.7/site-packages/airflow/www/views.py", line 1216, in recurse_nodes
    for d in dates],
AttributeError: 'NoneType' object has no attribute 'isoformat'{code}



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