“Unrecognised Dataset” error occurs w/ concurrent users

Using Streamlit
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Error: Unrecognized data set: decc170027f72833ee6bda4d99526ec0
at u (http://localhost:8501/static/js/7612.3f409b56.chunk.js:2:336974)
at oC (http://localhost:8501/static/js/7612.3f409b56.chunk.js:2:742221)
at HC.aC [as change] (http://localhost:8501/static/js/7612.3f409b56.chunk.js:2:742348)
at HC.insert (http://localhost:8501/static/js/7612.3f409b56.chunk.js:2:755518)
at E.createView (http://localhost:8501/static/js/8460.570de48a.chunk.js:1:12304)
at async E.componentDidUpdate (http://localhost:8501/static/js/8460.570de48a.chunk.js:1:10411)
  1. Share the Streamlit and Python versions.
    Python 3.9
    Streamlit 1.40

I’ve seen this topic in a few different threads but am not 100% convinced that there has been a proper resolution as the only solution wasn’t confirmed that it worked. This app works extremely well with a single user but as soon as multiple instances are spun up the plotting throws this error. Not clear what exactly is causing it.

Any help is greatly appreciated. :slight_smile:

2

Updated the streamlit version to 1.43 and it appears to not throw the error anymore. The graph goes blank temporarily and then comes back later. I’d like to understand a bit better on what is going on under the hood here.

:slight_smile:

3

I have also had this error com up with 1.44 and 1.45. Downgrading to 1.43 isn’t ideal, but it fixes the issue for me, too.

4

Without going too far down the rabbit hole, I was able to workaround this issue by modifying the data set names in the Altair charts. This temporary fix is working for me in in 1.45.1.

"""Takes an Altair chart, renames its data sets and returns a VegaLiteSpec"""
def temp_fix(chart:alt.Chart):
    vega_lite_spec = chart.to_dict()
    vega_lite_str = json.dumps(chart.to_dict(), indent=2)
    for dataset_index, dataset_name in enumerate([k for k in vega_lite_spec["datasets"].keys() if k.startswith("data-")]):
        new_dataset_name = f"dataset_{dataset_index}"
        vega_lite_str = vega_lite_str.replace(f'{dataset_name}', f'{new_dataset_name}')
    vega_lite_spec = json.loads(vega_lite_str)
    return vega_lite_spec

# Note: This yields the "Unrecognized data set" error some of the time
# st.altair(chart)

# Note: No error with this, and the chart seems to look and work the same as before.
st.vega_lite_chart(spec=temp_fix(chart))

This is a temporary fix. If anyone knows what the real issue is and how to resolve it properly, please please please pipe up.

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