Exception thrown in multiprocessing Pool not detected

Question

It seems that when an exception is raised from a multiprocessing.Pool process, there is no stack trace or any other indication that it has failed. Example:

Answer 1

I created a module RemoteException.py that shows the full traceback of a exception in a process. Python2. Download it and add this to your code:

import RemoteException

@RemoteException.showError
def go():
    raise Exception('Error!')

if __name__ == '__main__':
    import multiprocessing
    p = multiprocessing.Pool(processes = 1)
    r = p.apply(go) # full traceback is shown here