python - Seeing ClosedPoolError when using urllib3.PoolManager -


when using urllib3.poolmanager (python 2.7, urllib3 version: 1.21) encountered closedpoolerror exceptions. after reading code i'm inclined believe expected since connection object returned may have been evicted pool's cache time used.

i have reproduced error following script:

https://pastebin.com/ajggvhuv

#!/bin/bash  set -ex  test_dir=/tmp/urllib3_bug mkdir -p $test_dir cd $test_dir virtualenv .virtualenv . .virtualenv/bin/activate pip install urllib3==1.21  # starts 3 threads pool size = 2 echo 'from urllib3 import poolmanager import threading threading import thread  pool_manager = poolmanager(num_pools=2)   def start(url):     print "getting", url, "on", threading.current_thread().ident     return pool_manager.urlopen("get", url)   thread1 = thread(target=start, args=["http://localhost:9998"]) thread2 = thread(target=start, args=["http://localhost:9999"]) thread3 = thread(target=start, args=["http://localhost:10000"])  thread1.start() import time time.sleep(1) thread2.start() thread3.start() ' > start.py  # simulates preemption sleeping thread echo '303a304,308 >         import time >         import threading >         print "simulating preemption on", threading.current_thread().ident >         time.sleep(3) >         print "waking on", threading.current_thread().ident' | patch $test_dir/.virtualenv/local/lib/python2.7/site-packages/urllib3/poolmanager.py - rm -f $test_dir/.virtualenv/local/lib/python2.7/site-packages/urllib3/poolmanager.pyc   python start.py

i create pool of size 2, run 3 threads, each of connecting different url. first thread should encounter closedpoolerror.

(the patch inserts sleep() reliably reproduce preemption on first thread).


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