Warning when working on concurrent.futures with st.cache_data

Using Streamlit
,
1

When using concurrent.futures with st.cache_data together, the console shows the following warning but doesn’t affect the result. If using a single thread, it works without any warning.

WARNING streamlit.runtime.caching.cache_data_api: No runtime found, using MemoryCacheStorageManager

Here is a simple code example:

import concurrent.futures
import streamlit as st
from numpy import random

def run():
    int_list = get_int_list(10)
    st.write(int_list)

@st.cache_data
def get_int_list(length):
    int_list = []

    # single thread
    # for i in range(length):
    #     int_list.append(get_randint())

   # concurrent.futures
    with concurrent.futures.ProcessPoolExecutor() as executor:
        futures = [executor.submit(get_randint) for i in range(length)]
        for future in concurrent.futures.as_completed(futures):
            int_list.append(future.result())

    return int_list

def get_randint():
    return random.randint(1, 100)

if __name__ == '__main__':
    run()

It doesn’t seem to matter, but is there any way to avoid the problem?