Calendar view is taking too long to load in airflow 2.3.0

[potiuk]

Discussed in #23545

^{Originally posted by sambhatt25 May 6, 2022}

Apache Airflow version

2.3.0 (latest released)

What happened

Calendar view in DAG is taking too long to load. It was fine in 2.2.5.

What you think should happen instead

No response

How to reproduce

No response

Operating System

MacOS 12.3

Versions of Apache Airflow Providers

No response

Deployment

Other 3rd-party Helm chart

Deployment details

No response

Anything else

No response

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct

[potiuk]

Details in #23545 but it looks like the calendar DAG is indeed slow with high-frequency DAGs. likely because of sequential retrieval with latency.

[bbovenzi]

We'd have to look out how the "planned" part of calendar view is calculated.

[bbovenzi]

Yes, so here we're just iterating through every single next_dagrun_info for a whole year. We should be able to interpret the schedule better than that.

UI-wise we could split the requests to show at least something to the user, but really, we need to improve the webserver code.

[jedcunningham]

#24262 is an attempted optimization for cron scheduled DAGs.

[bbovenzi]

I think the PR above should be enough to close this.