dimberman opened a new issue #7788: webgui cannot display all tasks URL: https://github.com/apache/airflow/issues/7788 <!-- Welcome to Apache Airflow! For a smooth issue process, try to answer the following questions. Don't worry if they're not all applicable; just try to include what you can :-) If you need to include code snippets or logs, please put them in fenced code blocks. If they're super-long, please use the details tag like <details><summary>super-long log</summary> lots of stuff </details> Please delete these comment blocks before submitting the issue. --> <!-- IMPORTANT!!! Please complete the next sections or the issue will be closed. This questions are the first thing we need to know to understand the context. --> **Apache Airflow version**: 1.10.7, 1.10.9 **What happened**: We have a "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':['[email protected]'], '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 ``` **What you expected to happen**: <!-- What do you think went wrong? --> **How to reproduce it**: Create an airflow deployment with this DAG file <!--- As minimally and precisely as possible. Keep in mind we do not have access to your cluster or dags. ---> **Anything else we need to know**: <!-- How often does this problem occur? Once? Every time etc? Any relevant logs to include? Put them here in side a detail tag: <details><summary>x.log</summary> lots of stuff </details> -->
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