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https://issues.apache.org/jira/browse/AIRFLOW-6799?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Work on AIRFLOW-6799 stopped by Soeren Laursen.
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> webgui cannot display all tasks
> -------------------------------
>
>                 Key: AIRFLOW-6799
>                 URL: https://issues.apache.org/jira/browse/AIRFLOW-6799
>             Project: Apache Airflow
>          Issue Type: Bug
>          Components: ui, webserver
>    Affects Versions: 1.10.7, 1.10.9
>         Environment: linux in a docker container.
>            Reporter: Soeren Laursen
>            Priority: Blocker
>
> The we have "to many" task the graph rendering stops with an 
> Edge 'undefined' is not in graph javascript error,
> There is no graph in the webgui. Lowering the number of task will enable the 
> the rendering again.
> Examplecode:
> from airflow import DAG
> from airflow.models import DAG
> from airflow.operators.dummy_operator import DummyOperator
> from datetime import datetime
> from datetime import timedelta
> DAG_task_concurrency = 30
> DAG_max_active_runs = 10
> MAIN_DAG_ID = 'BUG_IN_GRAPH_DISPLAY'
> default_args = {
>     'owner':'prod', 
>     'depends_on_past':False, 
>     'email':['s...@fcoo.dk'], 
>     'email_on_failure':False, 
>     'email_on_retry':False, 
>     'retries':3, 
>     'retry_delay':timedelta(seconds=30),
>     'queue':'default'}
> BUG_DAG = DAG(MAIN_DAG_ID,
>               default_args=default_args,
>               catchup=False,
>               orientation='LR',
>               concurrency=DAG_task_concurrency,
>               schedule_interval='@once',
>               max_active_runs=DAG_max_active_runs,
>               start_date=(datetime(2020, 2, 5))
> )
> # To many tasks
> max_task = 160
> # 156 ok
> task_range = list(range(0, max_task + 1))
> start_task =  DummyOperator(task_id='start_task', dag=BUG_DAG)
> after_all_complete =  DummyOperator(task_id='after_all_complete', dag=BUG_DAG)
> for task_step in task_range:
>     task1 = DummyOperator(task_id='task_{0}'.format(task_step),dag=BUG_DAG)
>     start_task >> task1 >> after_all_complete



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