Deck.gl Contour bufferData error

[ekatrif]

Bug description

Hi! This bug occurred when trying to create a test Contour chart.

1. Create new deck.gl Contour chart with sf_population_polygons dataset
2. Add Population in Weight field
3. Try to change Cell cize
4. UI freezes, multiple warnings in console:WebGL: INVALID_OPERATION: bufferData: size more than 32-bit

Does anyone have any ideas on how to fix this?

Screenshots/recordings

No response

Superset version

master / latest-dev

Python version

3.9

Node version

16

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.

[dosubot]

Hi @ekatrif! I'm Dosu and I’m helping the superset team.

This error happens because setting a very small cell size in the deck.gl Contour chart causes the number of grid cells (and thus the data buffer sent to WebGL) to explode, exceeding the 32-bit buffer size limit and freezing the UI. Superset passes your cell size value directly to deck.gl without any validation or upper/lower bounds, so extreme values can easily trigger this issue see code reference.

To avoid this, use a larger cell size (e.g., 200 or 300 meters) and avoid very small values. There’s currently no built-in safeguard in Superset to prevent this, so you’ll need to choose values that keep the grid resolution reasonable for your dataset and viewport.

If you want to prevent this in the UI, it would require adding validation or min/max limits to the cell size control. Right now, Superset acts as a thin wrapper over deck.gl and does not handle these errors, so the best workaround is to avoid small cell sizes that could cause buffer overflows.

To reply, just mention @dosu.

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[hassaansaleem28]

I’ll try to reproduce this on the latest master. If I can confirm it, I’ll investigate a fix and update here.