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https://issues.apache.org/jira/browse/AIRFLOW-1717?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ash Berlin-Taylor closed AIRFLOW-1717.
--------------------------------------
Resolution: Fixed
> 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: 1.8.0
> Reporter: Ambrish Bhargava
> Priority: Major
>
> 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': ['airf...@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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