ios - Excessive number of pending callbacks: 501. Some pending callbacks that might have leaked

Question

In my react-native project, I am getting the following error message:

Warning: Please report: Excessive number of pending callbacks: 501. Some pending callbacks that might have leaked by never being called from native code:
{"203":{"module":"MyModule","method":"startProcessing"},"276":{"module":"RNFetchBlob","method":"emitExpiredEvent"},"1855":{},"1856":{},"1857":{},"1858":{},"1859":{},"1860":{},"1861":{},"1862":{},"1863":{},"1864":{},"1865":{},"1866":{},"1867":{},"1868":{},"1869":{},"1870":{},"1871":{},"1872":{},"1873":{},"1874":{},"1875":{},"1876":{},"1877":{},"1878":{},"1879":{},"1880":{},"1881":{},"1882":{},"1883":{},"1884":{},"1885":{},"1886":{},"1887":{},"1888":{},"1889":{},"1890":{},"1891":{},"1892":{},"1893":{},"1894":{},"1895":{},"1896":{},"1897":{},"1898":{},"1899":{},"1900":{},"1901":{},"1902":{},"...(truncated keys)...":451}

Can anyone tell me what module all of these callbacks are coming from or how to interpret this message?

question from:https://stackoverflow.com/questions/65617368/excessive-number-of-pending-callbacks-501-some-pending-callbacks-that-might-ha

Answer 1

It seems that the issue was that an async function was being executed in a loop. The loop was firing off lots of async calls almost simultaneously which resulted in excessive number of pending callbacks.