Logs do not show in the UI, although they are there in devtools and can be downloaded

[kchodorow]

Apache Airflow version

3.1.7

If "Other Airflow 3 version" selected, which one?

No response

What happened?

Airflow's task logs are not showing in the UI. Sometimes they show, but are cut off at the top or bottom. If I look at the source in devtools, the log content is being loaded. If I click the download button, the logs download correctly. However, the UI shows a blank window.

I've attached a screenshot of the blank log window and the devtools console showin the content of the log.

What you think should happen instead?

The logs should be displayed.

How to reproduce

Run a task and look at the logs in the UI. I'm using up-to-date Chrome on Mac, dark mode, no extensions.

Operating System

MacOS Tahoe 26.3

Versions of Apache Airflow Providers

apache-airflow-providers-common-compat==1.8.0
apache-airflow-providers-common-io==1.6.4
apache-airflow-providers-common-sql==1.28.2
apache-airflow-providers-fab==1.2.2
apache-airflow-providers-ftp==3.10.1
apache-airflow-providers-http==4.12.0
apache-airflow-providers-imap==3.6.1
apache-airflow-providers-smtp==2.3.1
apache-airflow-providers-sqlite==3.8.2
apache-airflow-providers-standard==1.9.1

Deployment

Virtualenv installation

Deployment details

Everything is run and stored locally other than the DB (which is Postgres).

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

[boring-cyborg]

Thanks for opening your first issue here! Be sure to follow the issue template! If you are willing to raise PR to address this issue please do so, no need to wait for approval.

[abhijeets25012-tech]

i would like to contribute

[kacpermuda]

Looks similar to issue from #57873, I can reproduce this on latest main run with breeze, I can only see first ~50 lines of logs, but they are all there, just not visible in the UI (see scroll on the right), when I download them I can see them all and when I filter, some logs show up in the UI.

cc @pierrejeambrun are you aware of any recent changes that might have caused this?

[pradeep-ac9]

I have using the Airflow for about 3 months. I still have the issue.
Whenever any task retries when fails, it wont show the logs immediately.
I have to make it as failed and after I have to make it as "Clear Task Instance", then only it will show the error for the previous one.

[kacpermuda]

@pradeep-ac9 What you describe looks like a separate issue, maybe there is an issue for that already, feel free to open one otherwise.

I was able to reproduce what I described above on latest main now, using breeze.

Just the simplest DAG, but with AIRFLOW__LOGGING__LOGGING_LEVEL=DEBUG.

import datetime as dt

from airflow import DAG
from airflow.providers.standard.operators.bash import BashOperator


with DAG(
    dag_id="dag",
    start_date=dt.datetime(2024, 7, 3),
    schedule=None,
) as dag:
    task_success = BashOperator(
        task_id="task_success",
        bash_command="exit 0;",
    )

It always show only first 46 lines:

[kacpermuda]

Now i realize that what I describe is probably also a separate issue, can't reproduce it on AF 3.1.7 as stated in the OP.

[kchodorow]

I mean, I also have that problem when the logs show (only showing partial logs). But it bothers me more when I can't see them at all!

[kacpermuda]

Separate issue was created for what I described: #62341

[pierrejeambrun]

I'll create a PR to fix this.