[BUG] Callback will not render new data until a delay is introduced

[iamzoltan]

Context Plotly, gunicorn, nginx, redis cache

dash                      2.15.0
dash-auth                 2.0.0
dash-bootstrap-components 1.5.0
dash-core-components      2.0.0
dash-html-components      2.0.0
dash-mantine-components   0.12.1
dash-table                5.0.0

Description

I have roughly 15 graphs that use the same signal as input. All of them update as expected, except for one. This one will not update regularly, but will occasionally update. I checked all the data coming into the callback from the cache, and everything is changing as expected, but the graph still does not update. I then decided to try adding a small delay in the callback, after the data was loaded, and that seemed to fix the issue. I know this is not the best solution, but I can't seem to figure out any other way. I even tried to force the frontend to update.

Expected behavior

I expected that the graph would update and render the new data that is coming in.

Any wisdom or advice on the matter is much appreciated.

Thanks for you time!

[CNFeffery]

@iamzoltan Can you provide code to reproduce the problem.

[iamzoltan]

@CNFeffery Do you mean for the unchanging callback?

[alexcjohnson]

@iamzoltan the entire app - ideally simplified to the smallest example that recreates the problem. In order to investigate this bug someone else will need to be able to run code that shows the problem.

[iamzoltan]

@alexcjohnson I see, I will have to check on that. If there anything I can run to provide you with more information?

[alexcjohnson]

This sounds like a very deep issue - a race condition or some such... which means it's very hard to guess where the root cause lies so debugging really needs a live environment and access to modify the source code. All that to say extra information that's NOT a runnable example is unlikely to be helpful, I'm afraid.

[iamzoltan]

Alright, I will see if I can send you the code base with some fake data.

[gvwilson]

Closing for now as we can't tackle this without a reproducible example (reprex) - if you're able to provide one, please re-open.