Ruslan Dautkhanov created AIRFLOW-1176:
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             Summary: Gantt graph is broken for @once DAG
                 Key: AIRFLOW-1176
                 URL: https://issues.apache.org/jira/browse/AIRFLOW-1176
             Project: Apache Airflow
          Issue Type: Bug
    Affects Versions: Airflow 1.8, 1.8.1, 1.8.0
         Environment: May-05-2017 Airflow master snapshot
            Reporter: Ruslan Dautkhanov
         Attachments: Gantt.png

Gantt visualization is brojen. 
It used to work on a ~month older Airflow snapshot. 

See attached screenshot.

- It just doesn't show anything (it used to show all >40 operators correctly)
- time scale is shifted so almost no visible

It is a `@once` DAG.. I noticed Airflow has a number of issues around `@once` 
DAG, so decided to mention.

{noformat}
main_dag = DAG(
    dag_id                         = 'DISCOVER-Oracle-Load-Mar2017-v1',
    default_args                   = default_args,                  # dafeult 
operators' arguments - see above
    user_defined_macros            = dag_macros,       # I do not get different 
between
    ## params                         = dag_macros,       # user_defined_macros 
and params
    #
    start_date                     = datetime.now(),                # or e.g. 
datetime(2015, 6, 1)
    # 'end_date'                   = datetime(2016, 1, 1),
    catchup                        = False,                         # Perform 
scheduler catchup (or only run latest)?
                                                                        # - 
defaults to True
    schedule_interval              = '@once',                       # 
'@once'=None?
                                                                     # doesn't 
create multiple dag runs automatically
    concurrency                    = 3,                             # task 
instances allowed to run concurrently
    max_active_runs                = 1,                             # only one 
DAG run at a time
    dagrun_timeout                 = timedelta(days=4),             # no way 
this dag should ran for 4 days
    orientation                    = 'TB',                          # default 
graph view
)
{noformat}



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