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test_pooling_base.py
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872 lines (690 loc) · 28.5 KB
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# Copyright 2012 10gen, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Base classes to test built-in connection-pooling with threads or greenlets.
"""
import gc
import random
import socket
import sys
import thread
import threading
import time
sys.path[0:0] = [""]
from nose.plugins.skip import SkipTest
import pymongo.pool
from pymongo.mongo_client import MongoClient
from pymongo.pool import Pool, NO_REQUEST, NO_SOCKET_YET, SocketInfo
from pymongo.errors import ConfigurationError
from test import version, host, port
from test.test_client import get_client
from test.utils import delay, is_mongos, one
N = 50
DB = "pymongo-pooling-tests"
if sys.version_info[0] >= 3:
from imp import reload
try:
import gevent
from gevent import Greenlet, monkey, hub
import gevent.coros, gevent.event
has_gevent = True
except ImportError:
has_gevent = False
class MongoThread(object):
"""A thread, or a greenlet, that uses a MongoClient"""
def __init__(self, test_case):
self.use_greenlets = test_case.use_greenlets
self.client = test_case.c
self.db = self.client[DB]
self.ut = test_case
self.passed = False
def start(self):
if self.use_greenlets:
# A Gevent extended Greenlet
self.thread = Greenlet(self.run)
else:
self.thread = threading.Thread(target=self.run)
self.thread.setDaemon(True) # Don't hang whole test if thread hangs
self.thread.start()
def join(self):
self.thread.join(300)
if self.use_greenlets:
assert self.thread.dead, "Greenlet timeout"
else:
assert not self.thread.isAlive(), "Thread timeout"
self.thread = None
def run(self):
self.run_mongo_thread()
# No exceptions thrown
self.passed = True
def run_mongo_thread(self):
raise NotImplementedError()
class SaveAndFind(MongoThread):
def run_mongo_thread(self):
for _ in xrange(N):
rand = random.randint(0, N)
_id = self.db.sf.save({"x": rand})
self.ut.assertEqual(rand, self.db.sf.find_one(_id)["x"])
class Unique(MongoThread):
def run_mongo_thread(self):
for _ in xrange(N):
self.client.start_request()
self.db.unique.insert({}) # no error
self.client.end_request()
class NonUnique(MongoThread):
def run_mongo_thread(self):
for _ in xrange(N):
self.client.start_request()
self.db.unique.insert({"_id": "jesse"}, w=0)
self.ut.assertNotEqual(None, self.db.error())
self.client.end_request()
class Disconnect(MongoThread):
def run_mongo_thread(self):
for _ in xrange(N):
self.client.disconnect()
class NoRequest(MongoThread):
def run_mongo_thread(self):
self.client.start_request()
errors = 0
for _ in xrange(N):
self.db.unique.insert({"_id": "jesse"}, w=0)
if not self.db.error():
errors += 1
self.client.end_request()
self.ut.assertEqual(0, errors)
def run_cases(ut, cases):
threads = []
nruns = 10
if (
ut.use_greenlets and sys.platform == 'darwin'
and gevent.version_info[0] < 1
):
# Gevent 0.13.6 bug on Mac, Greenlet.join() hangs if more than
# about 35 Greenlets share a MongoClient. Apparently fixed in
# recent Gevent development.
nruns = 5
for case in cases:
for i in range(nruns):
t = case(ut)
t.start()
threads.append(t)
for t in threads:
t.join()
for t in threads:
assert t.passed, "%s.run_mongo_thread() threw an exception" % repr(t)
class OneOp(MongoThread):
def __init__(self, ut):
super(OneOp, self).__init__(ut)
def run_mongo_thread(self):
pool = self.client._MongoClient__pool
assert len(pool.sockets) == 1, "Expected 1 socket, found %d" % (
len(pool.sockets)
)
sock_info = one(pool.sockets)
self.client.start_request()
# start_request() hasn't yet moved the socket from the general pool into
# the request
assert len(pool.sockets) == 1
assert one(pool.sockets) == sock_info
self.client[DB].test.find_one()
# find_one() causes the socket to be used in the request, so now it's
# bound to this thread
assert len(pool.sockets) == 0
assert pool._get_request_state() == sock_info
self.client.end_request()
# The socket is back in the pool
assert len(pool.sockets) == 1
assert one(pool.sockets) == sock_info
class CreateAndReleaseSocket(MongoThread):
class Rendezvous(object):
def __init__(self, nthreads, use_greenlets):
self.nthreads = nthreads
self.nthreads_run = 0
if use_greenlets:
self.lock = gevent.coros.RLock()
self.ready = gevent.event.Event()
else:
self.lock = threading.Lock()
self.ready = threading.Event()
def __init__(self, ut, client, start_request, end_request, rendevous):
super(CreateAndReleaseSocket, self).__init__(ut)
self.client = client
self.start_request = start_request
self.end_request = end_request
self.rendevous = rendevous
def run_mongo_thread(self):
# Do an operation that requires a socket.
# test_max_pool_size uses this to spin up lots of threads requiring
# lots of simultaneous connections, to ensure that Pool obeys its
# max_size configuration and closes extra sockets as they're returned.
for i in range(self.start_request):
self.client.start_request()
# Use a socket
self.client[DB].test.find_one()
# Don't finish until all threads reach this point
r = self.rendevous
r.lock.acquire()
r.nthreads_run += 1
if r.nthreads_run == r.nthreads:
# Everyone's here, let them finish
r.ready.set()
r.lock.release()
else:
r.lock.release()
r.ready.wait(timeout=60)
assert r.ready.isSet(), "Rendezvous timed out"
for i in range(self.end_request):
self.client.end_request()
class _TestPoolingBase(object):
"""Base class for all client-pool tests. Doesn't inherit from
unittest.TestCase, and its name is prefixed with "_" to avoid being
run by nose. Real tests double-inherit from this base and from TestCase.
"""
use_greenlets = False
def setUp(self):
if self.use_greenlets:
if not has_gevent:
raise SkipTest("Gevent not installed")
# Note we don't do patch_thread() or patch_all() - we're
# testing here that patch_thread() is unnecessary for
# the client pool to work properly.
monkey.patch_socket()
self.c = self.get_client(auto_start_request=False)
# reset the db
db = self.c[DB]
db.unique.drop()
db.test.drop()
db.unique.insert({"_id": "jesse"})
db.test.insert([{} for i in range(10)])
def tearDown(self):
self.c.close()
if self.use_greenlets:
# Undo patch
reload(socket)
def get_client(self, *args, **kwargs):
opts = kwargs.copy()
opts['use_greenlets'] = self.use_greenlets
return get_client(*args, **opts)
def get_pool(self, *args, **kwargs):
kwargs['use_greenlets'] = self.use_greenlets
return Pool(*args, **kwargs)
def assert_no_request(self):
self.assertEqual(
NO_REQUEST, self.c._MongoClient__pool._get_request_state()
)
def assert_request_without_socket(self):
self.assertEqual(
NO_SOCKET_YET, self.c._MongoClient__pool._get_request_state()
)
def assert_request_with_socket(self):
self.assertTrue(isinstance(
self.c._MongoClient__pool._get_request_state(), SocketInfo
))
def assert_pool_size(self, pool_size):
self.assertEqual(
pool_size, len(self.c._MongoClient__pool.sockets)
)
class _TestPooling(_TestPoolingBase):
"""Basic pool tests, to be run both with threads and with greenlets."""
def test_max_pool_size_validation(self):
self.assertRaises(
ConfigurationError, MongoClient, host=host, port=port,
max_pool_size=-1
)
self.assertRaises(
ConfigurationError, MongoClient, host=host, port=port,
max_pool_size='foo'
)
c = MongoClient(host=host, port=port, max_pool_size=100)
self.assertEqual(c.max_pool_size, 100)
def test_no_disconnect(self):
run_cases(self, [NoRequest, NonUnique, Unique, SaveAndFind])
def test_simple_disconnect(self):
# MongoClient just created, expect 1 free socket
self.assert_pool_size(1)
self.assert_no_request()
self.c.start_request()
self.assert_request_without_socket()
cursor = self.c[DB].stuff.find()
# Cursor hasn't actually caused a request yet, so there's still 1 free
# socket.
self.assert_pool_size(1)
self.assert_request_without_socket()
# Actually make a request to server, triggering a socket to be
# allocated to the request
list(cursor)
self.assert_pool_size(0)
self.assert_request_with_socket()
# Pool returns to its original state
self.c.end_request()
self.assert_no_request()
self.assert_pool_size(1)
self.c.disconnect()
self.assert_pool_size(0)
self.assert_no_request()
def test_disconnect(self):
run_cases(self, [SaveAndFind, Disconnect, Unique])
def test_independent_pools(self):
# Test for regression of very early PyMongo bug: separate pools shared
# state.
p = self.get_pool((host, port), 10, None, None, False)
self.c.start_request()
self.c.pymongo_test.test.find_one()
self.assertEqual(set(), p.sockets)
self.c.end_request()
self.assert_pool_size(1)
self.assertEqual(set(), p.sockets)
def test_dependent_pools(self):
self.assert_pool_size(1)
self.c.start_request()
self.assert_request_without_socket()
self.c.pymongo_test.test.find_one()
self.assert_request_with_socket()
self.assert_pool_size(0)
self.c.end_request()
self.assert_pool_size(1)
t = OneOp(self)
t.start()
t.join()
self.assertTrue(t.passed, "OneOp.run() threw exception")
self.assert_pool_size(1)
self.c.pymongo_test.test.find_one()
self.assert_pool_size(1)
def test_multiple_connections(self):
a = self.get_client(auto_start_request=False)
b = self.get_client(auto_start_request=False)
self.assertEqual(1, len(a._MongoClient__pool.sockets))
self.assertEqual(1, len(b._MongoClient__pool.sockets))
a.start_request()
a.pymongo_test.test.find_one()
self.assertEqual(0, len(a._MongoClient__pool.sockets))
a.end_request()
self.assertEqual(1, len(a._MongoClient__pool.sockets))
self.assertEqual(1, len(b._MongoClient__pool.sockets))
a_sock = one(a._MongoClient__pool.sockets)
b.end_request()
self.assertEqual(1, len(a._MongoClient__pool.sockets))
self.assertEqual(1, len(b._MongoClient__pool.sockets))
b.start_request()
b.pymongo_test.test.find_one()
self.assertEqual(1, len(a._MongoClient__pool.sockets))
self.assertEqual(0, len(b._MongoClient__pool.sockets))
b.end_request()
b_sock = one(b._MongoClient__pool.sockets)
b.pymongo_test.test.find_one()
a.pymongo_test.test.find_one()
self.assertEqual(b_sock,
b._MongoClient__pool.get_socket((b.host, b.port)))
self.assertEqual(a_sock,
a._MongoClient__pool.get_socket((a.host, a.port)))
a_sock.close()
b_sock.close()
def test_request(self):
# Check that Pool gives two different sockets in two calls to
# get_socket() -- doesn't automatically put us in a request any more
cx_pool = self.get_pool(
pair=(host,port),
max_size=10,
net_timeout=1000,
conn_timeout=1000,
use_ssl=False
)
sock0 = cx_pool.get_socket()
sock1 = cx_pool.get_socket()
self.assertNotEqual(sock0, sock1)
# Now in a request, we'll get the same socket both times
cx_pool.start_request()
sock2 = cx_pool.get_socket()
sock3 = cx_pool.get_socket()
self.assertEqual(sock2, sock3)
# Pool didn't keep reference to sock0 or sock1; sock2 and 3 are new
self.assertNotEqual(sock0, sock2)
self.assertNotEqual(sock1, sock2)
# Return the request sock to pool
cx_pool.end_request()
sock4 = cx_pool.get_socket()
sock5 = cx_pool.get_socket()
# Not in a request any more, we get different sockets
self.assertNotEqual(sock4, sock5)
# end_request() returned sock2 to pool
self.assertEqual(sock4, sock2)
for s in [sock0, sock1, sock2, sock3, sock4, sock5]:
s.close()
def test_reset_and_request(self):
# reset() is called after a fork, or after a socket error. Ensure that
# a new request is begun if a request was in progress when the reset()
# occurred, otherwise no request is begun.
p = self.get_pool((host, port), 10, None, None, False)
self.assertFalse(p.in_request())
p.start_request()
self.assertTrue(p.in_request())
p.reset()
self.assertTrue(p.in_request())
p.end_request()
self.assertFalse(p.in_request())
p.reset()
self.assertFalse(p.in_request())
def test_pool_reuses_open_socket(self):
# Test Pool's _check_closed() method doesn't close a healthy socket
cx_pool = self.get_pool((host,port), 10, None, None, False)
sock_info = cx_pool.get_socket()
cx_pool.maybe_return_socket(sock_info)
# trigger _check_closed, which only runs on sockets that haven't been
# used in a second
time.sleep(1.1)
new_sock_info = cx_pool.get_socket()
self.assertEqual(sock_info, new_sock_info)
cx_pool.maybe_return_socket(new_sock_info)
self.assertEqual(1, len(cx_pool.sockets))
def test_pool_removes_dead_socket(self):
# Test that Pool removes dead socket and the socket doesn't return
# itself PYTHON-344
cx_pool = self.get_pool((host,port), 10, None, None, False)
sock_info = cx_pool.get_socket()
# Simulate a closed socket without telling the SocketInfo it's closed
sock_info.sock.close()
self.assertTrue(pymongo.pool._closed(sock_info.sock))
cx_pool.maybe_return_socket(sock_info)
time.sleep(1.1) # trigger _check_closed
new_sock_info = cx_pool.get_socket()
self.assertEqual(0, len(cx_pool.sockets))
self.assertNotEqual(sock_info, new_sock_info)
cx_pool.maybe_return_socket(new_sock_info)
self.assertEqual(1, len(cx_pool.sockets))
def test_pool_removes_dead_request_socket_after_1_sec(self):
# Test that Pool keeps request going even if a socket dies in request
cx_pool = self.get_pool((host,port), 10, None, None, False)
cx_pool.start_request()
# Get the request socket
sock_info = cx_pool.get_socket()
self.assertEqual(0, len(cx_pool.sockets))
self.assertEqual(sock_info, cx_pool._get_request_state())
sock_info.sock.close()
cx_pool.maybe_return_socket(sock_info)
time.sleep(1.1) # trigger _check_closed
# Although the request socket died, we're still in a request with a
# new socket
new_sock_info = cx_pool.get_socket()
self.assertTrue(cx_pool.in_request())
self.assertNotEqual(sock_info, new_sock_info)
self.assertEqual(new_sock_info, cx_pool._get_request_state())
cx_pool.maybe_return_socket(new_sock_info)
self.assertEqual(new_sock_info, cx_pool._get_request_state())
self.assertEqual(0, len(cx_pool.sockets))
cx_pool.end_request()
self.assertEqual(1, len(cx_pool.sockets))
def test_pool_removes_dead_request_socket(self):
# Test that Pool keeps request going even if a socket dies in request
cx_pool = self.get_pool((host,port), 10, None, None, False)
cx_pool.start_request()
# Get the request socket
sock_info = cx_pool.get_socket()
self.assertEqual(0, len(cx_pool.sockets))
self.assertEqual(sock_info, cx_pool._get_request_state())
# Unlike in test_pool_removes_dead_request_socket_after_1_sec, we
# set sock_info.closed and *don't* wait 1 second
sock_info.close()
cx_pool.maybe_return_socket(sock_info)
# Although the request socket died, we're still in a request with a
# new socket
new_sock_info = cx_pool.get_socket()
self.assertTrue(cx_pool.in_request())
self.assertNotEqual(sock_info, new_sock_info)
self.assertEqual(new_sock_info, cx_pool._get_request_state())
cx_pool.maybe_return_socket(new_sock_info)
self.assertEqual(new_sock_info, cx_pool._get_request_state())
self.assertEqual(0, len(cx_pool.sockets))
cx_pool.end_request()
self.assertEqual(1, len(cx_pool.sockets))
def test_pool_removes_dead_socket_after_request(self):
# Test that Pool handles a socket dying that *used* to be the request
# socket.
cx_pool = self.get_pool((host,port), 10, None, None, False)
cx_pool.start_request()
# Get the request socket
sock_info = cx_pool.get_socket()
self.assertEqual(sock_info, cx_pool._get_request_state())
# End request
cx_pool.end_request()
self.assertEqual(1, len(cx_pool.sockets))
# Kill old request socket
sock_info.sock.close()
cx_pool.maybe_return_socket(sock_info)
time.sleep(1.1) # trigger _check_closed
# Dead socket detected and removed
new_sock_info = cx_pool.get_socket()
self.assertFalse(cx_pool.in_request())
self.assertNotEqual(sock_info, new_sock_info)
self.assertEqual(0, len(cx_pool.sockets))
self.assertFalse(pymongo.pool._closed(new_sock_info.sock))
cx_pool.maybe_return_socket(new_sock_info)
self.assertEqual(1, len(cx_pool.sockets))
def test_socket_reclamation(self):
if sys.platform.startswith('java'):
raise SkipTest("Jython can't do socket reclamation")
# Check that if a thread starts a request and dies without ending
# the request, that the socket is reclaimed into the pool.
cx_pool = self.get_pool(
pair=(host,port),
max_size=10,
net_timeout=1000,
conn_timeout=1000,
use_ssl=False,
)
self.assertEqual(0, len(cx_pool.sockets))
lock = None
the_sock = [None]
def leak_request():
self.assertEqual(NO_REQUEST, cx_pool._get_request_state())
cx_pool.start_request()
self.assertEqual(NO_SOCKET_YET, cx_pool._get_request_state())
sock_info = cx_pool.get_socket()
self.assertEqual(sock_info, cx_pool._get_request_state())
the_sock[0] = id(sock_info.sock)
cx_pool.maybe_return_socket(sock_info)
if not self.use_greenlets:
lock.release()
if self.use_greenlets:
g = Greenlet(leak_request)
g.start()
g.join(1)
self.assertTrue(g.ready(), "Greenlet is hung")
else:
lock = thread.allocate_lock()
lock.acquire()
# Start a thread WITHOUT a threading.Thread - important to test that
# Pool can deal with primitive threads.
thread.start_new_thread(leak_request, ())
# Join thread
acquired = lock.acquire()
self.assertTrue(acquired, "Thread is hung")
# Make sure thread is really gone
time.sleep(1)
if 'PyPy' in sys.version:
gc.collect()
# Access the thread local from the main thread to trigger the
# ThreadVigil's delete callback, returning the request socket to
# the pool.
# In Python 2.7.0 and lesser, a dead thread's locals are deleted
# and those locals' weakref callbacks are fired only when another
# thread accesses the locals and finds the thread state is stale,
# see http://bugs.python.org/issue1868. Accessing the thread
# local from the main thread is a necessary part of this test, and
# realistic: in a multithreaded web server a new thread will access
# Pool._ident._local soon after an old thread has died.
cx_pool._ident.get()
# Pool reclaimed the socket
self.assertEqual(1, len(cx_pool.sockets))
self.assertEqual(the_sock[0], id(one(cx_pool.sockets).sock))
self.assertEqual(0, len(cx_pool._tid_to_sock))
class _TestMaxPoolSize(_TestPoolingBase):
"""Test that connection pool keeps proper number of idle sockets open,
no matter how start/end_request are called. To be run both with threads and
with greenlets.
"""
def _test_max_pool_size(
self, start_request, end_request, max_pool_size=4, nthreads=10):
"""Start `nthreads` threads. Each calls start_request `start_request`
times, then find_one and waits at a barrier; once all reach the barrier
each calls end_request `end_request` times. The test asserts that the
pool ends with min(max_pool_size, nthreads) sockets or, if
start_request wasn't called, at least one socket.
This tests both max_pool_size enforcement and that leaked request
sockets are eventually returned to the pool when their threads end.
You may need to increase ulimit -n on Mac.
If you increase nthreads over about 35, note a
Gevent 0.13.6 bug on Mac: Greenlet.join() hangs if more than
about 35 Greenlets share a MongoClient. Apparently fixed in
recent Gevent development.
"""
c = self.get_client(
max_pool_size=max_pool_size, auto_start_request=False)
rendevous = CreateAndReleaseSocket.Rendezvous(
nthreads, self.use_greenlets)
threads = []
for i in range(nthreads):
t = CreateAndReleaseSocket(
self, c, start_request, end_request, rendevous)
threads.append(t)
for t in threads:
t.start()
for t in threads:
t.join()
# join() returns before the thread state is cleared; give it time.
time.sleep(1)
for t in threads:
self.assertTrue(t.passed)
# Socket-reclamation doesn't work in Jython
if not sys.platform.startswith('java'):
cx_pool = c._MongoClient__pool
# Socket-reclamation depends on timely garbage-collection
if 'PyPy' in sys.version:
gc.collect()
if self.use_greenlets:
# Wait for Greenlet.link() callbacks to execute
the_hub = hub.get_hub()
if hasattr(the_hub, 'join'):
# Gevent 1.0
the_hub.join()
else:
# Gevent 0.13 and less
the_hub.shutdown()
if start_request:
# Trigger final cleanup in Python <= 2.7.0.
cx_pool._ident.get()
expected_idle = min(max_pool_size, nthreads)
message = (
'%d idle sockets (expected %d) and %d request sockets'
' (expected 0)' % (
len(cx_pool.sockets), expected_idle,
len(cx_pool._tid_to_sock)))
self.assertEqual(
expected_idle, len(cx_pool.sockets), message)
else:
# Without calling start_request(), threads can safely share
# sockets; the number running concurrently, and hence the number
# of sockets needed, is between 1 and
# min(max_pool_size, nthreads), depending on thread-scheduling.
self.assertTrue(len(cx_pool.sockets) >= 1)
self.assertEqual(0, len(cx_pool._tid_to_sock))
def test_max_pool_size(self):
self._test_max_pool_size(0, 0)
def test_max_pool_size_with_request(self):
self._test_max_pool_size(1, 1)
def test_max_pool_size_with_redundant_request(self):
self._test_max_pool_size(2, 1)
def test_max_pool_size_with_redundant_request2(self):
self._test_max_pool_size(20, 1)
def test_max_pool_size_with_leaked_request(self):
# Call start_request() but not end_request() -- when threads die, they
# should return their request sockets to the pool.
self._test_max_pool_size(1, 0)
def test_max_pool_size_with_end_request_only(self):
# Call end_request() but not start_request()
self._test_max_pool_size(0, 1)
class _TestPoolSocketSharing(_TestPoolingBase):
"""Directly test that two simultaneous operations don't share a socket. To
be run both with threads and with greenlets.
"""
def _test_pool(self, use_request):
"""
Test that the connection pool prevents both threads and greenlets from
using a socket at the same time.
Sequence:
gr0: start a slow find()
gr1: start a fast find()
gr1: get results
gr0: get results
"""
cx = get_client(
use_greenlets=self.use_greenlets,
auto_start_request=False
)
db = cx.pymongo_test
db.test.remove()
db.test.insert({'_id': 1})
history = []
def find_fast():
if use_request:
cx.start_request()
history.append('find_fast start')
# With greenlets and the old connection._Pool, this would throw
# AssertionError: "This event is already used by another
# greenlet"
self.assertEqual({'_id': 1}, db.test.find_one())
history.append('find_fast done')
if use_request:
cx.end_request()
def find_slow():
if use_request:
cx.start_request()
history.append('find_slow start')
# Javascript function that pauses N seconds per document
fn = delay(10)
if (is_mongos(db.connection) or not
version.at_least(db.connection, (1, 7, 2))):
# mongos doesn't support eval so we have to use $where
# which is less reliable in this context.
self.assertEqual(1, db.test.find({"$where": fn}).count())
else:
# 'nolock' allows find_fast to start and finish while we're
# waiting for this to complete.
self.assertEqual({'ok': 1.0, 'retval': True},
db.command('eval', fn, nolock=True))
history.append('find_slow done')
if use_request:
cx.end_request()
if self.use_greenlets:
gr0, gr1 = Greenlet(find_slow), Greenlet(find_fast)
gr0.start()
gr1.start_later(.1)
else:
gr0 = threading.Thread(target=find_slow)
gr0.setDaemon(True)
gr1 = threading.Thread(target=find_fast)
gr1.setDaemon(True)
gr0.start()
time.sleep(.1)
gr1.start()
gr0.join()
gr1.join()
self.assertEqual([
'find_slow start',
'find_fast start',
'find_fast done',
'find_slow done',
], history)
def test_pool(self):
self._test_pool(use_request=False)
def test_pool_request(self):
self._test_pool(use_request=True)