New submission from Sebastian Kreft:
With Python 3.4.1 compiled from source, I'm having an issue in which every now
and then some Futures are not marked as completed even though the underlying
workload is done.
My workload is launching two subprocess in parallel, and whenever one is ready,
launches another one. In one of the runs, the whole process got stuck after
launching about 3K subprocess, and the underlying processes had in fact
finished.
To wait for the finished subprocesses, I'm using FIRST_COMPLETED. Below is the
core of my workload:
for element in element_generator:
while len(running) >= max_tasks:
done, pending = concurrent.futures.wait(running, timeout=15.0,
return_when=concurrent.futures.FIRST_COMPLETED)
process_results(done)
running = pending
running.add(executor.submit(exe_subprocess, element))
Replicating the issue takes time, but I've been able to successfully reproduce
it with 2 and 3 processes in parallel.
Note: this was already posted in comments to http://bugs.python.org/issue20319,
however it did not receive the proper atention as that issue is already closed.
As suggested there I printed the status of the never finished futures and this
is the result:
State: RUNNING, Result: None, Exception: None, Waiters: 0, Cancelled: False,
Running: True, Done: False
The information does not seem very relevant. However, I can attach a console
and debug from there.
----------
messages: 222034
nosy: Sebastian.Kreft.Deezer
priority: normal
severity: normal
status: open
title: Futures are not marked as completed
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Python tracker <[email protected]>
<http://bugs.python.org/issue21899>
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