andrey-anshin-godel opened a new issue #18242:
URL: https://github.com/apache/airflow/issues/18242
### Apache Airflow version
2.2.0b1 (beta snapshot)
### Operating System
Linux
### Versions of Apache Airflow Providers
n/a
### Deployment
Docker-Compose
### Deployment details
Docker Image: apache/airflow:2.2.0b1-python3.8
```shell
$ docker version
Client:
Version: 20.10.8
API version: 1.41
Go version: go1.16.6
Git commit: 3967b7d28e
Built: Wed Aug 4 10:59:01 2021
OS/Arch: linux/amd64
Context: default
Experimental: true
Server:
Engine:
Version: 20.10.8
API version: 1.41 (minimum version 1.12)
Go version: go1.16.6
Git commit: 75249d88bc
Built: Wed Aug 4 10:58:48 2021
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: v1.5.5
GitCommit: 72cec4be58a9eb6b2910f5d10f1c01ca47d231c0.m
runc:
Version: 1.0.2
GitCommit: v1.0.2-0-g52b36a2d
docker-init:
Version: 0.19.0
GitCommit: de40ad0
```
```shell
$ docker-compose version
docker-compose version 1.29.2, build unknown
docker-py version: 5.0.2
CPython version: 3.9.6
OpenSSL version: OpenSSL 1.1.1l 24 Aug 2021
```
### What happened
Rendered Template endpoint raise error if not Task Instances exists (e.g.
fresh DAG)
```
Traceback (most recent call last):
File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line
2447, in wsgi_app
response = self.full_dispatch_request()
File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line
1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line
1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/home/airflow/.local/lib/python3.8/site-packages/flask/_compat.py",
line 39, in reraise
raise value
File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line
1950, in full_dispatch_request
rv = self.dispatch_request()
File "/home/airflow/.local/lib/python3.8/site-packages/flask/app.py", line
1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/www/auth.py", line
51, in decorated
return func(*args, **kwargs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/www/decorators.py",
line 72, in wrapper
return f(*args, **kwargs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/utils/session.py",
line 70, in wrapper
return func(*args, session=session, **kwargs)
File
"/home/airflow/.local/lib/python3.8/site-packages/airflow/www/views.py", line
1055, in rendered_templates
ti = dag_run.get_task_instance(task_id=task.task_id, session=session)
AttributeError: 'NoneType' object has no attribute 'get_task_instance'
```
### What you expected to happen
I understand that probably no way to render this value anymore by airflow
webserver.
So basically it can be replaced by the same warning/error which throw when
we tried to access to XCom for TaskInstance which not exists (Task Instance ->
XCom -> redirect to /home -> In top of the page Task Not exists)
However it would be nice if we have same as we have in 2.1 (and probably
earlier in 2.x)
### How to reproduce
1. Create new DAG
2. Go to Graph View
3. Try to access Rendered Tab
4. Get an error
### Anything else
Every time.
Sample url:
`http://127.0.0.1:8081/rendered-templates?dag_id=sample_dag&task_id=sample_task&execution_date=2021-09-14T10%3A10%3A23.484252%2B00%3A00`
Discuss with @uranusjr
### Are you willing to submit PR?
- [ ] Yes I am willing to submit a PR!
### Code of Conduct
- [X] I agree to follow this project's [Code of
Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
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