dosubot[bot] commented on issue #29831:
URL: https://github.com/apache/superset/issues/29831#issuecomment-2263763924
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Creating a thread in `superset_config.py` causes the entire Superset app to
freeze until the thread completes because the configuration file is executed in
the main thread during the initialization of the application. This means that
any blocking operation, such as creating and running a thread, will block the
main thread and prevent the application from continuing its initialization
process.
To prevent this behavior, you should avoid running blocking operations
directly in the configuration file. Instead, you can defer the execution of
such operations to a later point in the application's lifecycle, such as after
the application has fully initialized.
Here is an example of how you can defer the execution of a blocking
operation using a Flask application context:
```python
# superset_config.py
from threading import Thread
from flask import current_app
def my_background_task():
# Your long-running task here
pass
def start_background_task():
thread = Thread(target=my_background_task)
thread.start()
def init_app(app):
with app.app_context():
start_background_task()
# Add the init_app function to the list of functions to be called when the
app is initialized
APP_INITIALIZATION = [init_app]
```
In this example, the `init_app` function is added to the
`APP_INITIALIZATION` list, which ensures that it will be called after the
application has been initialized. The `start_background_task` function creates
and starts a new thread for the long-running task, preventing it from blocking
the main thread during the application's initialization
<sup>[[1]](https://github.com/apache/superset/blob/master/superset/config.py)</sup>.
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