Pull Plasma from Apache Arrow and remove Plasma store from Ray. (#692)

* Rebase Ray on top of Plasma in Apache Arrow

* add thirdparty building scripts

* use rebased arrow

* fix

* fix build

* fix python visibility

* comment out C tests for now

* fix multithreading

* fix

* reduce logging

* fix plasma manager multithreading

* make sure old and new object IDs can coexist peacefully

* more rebasing

* update

* fixes

* fix

* install pyarrow

* install cython

* fix

* install newer cmake

* fix

* rebase on top of latest arrow

* getting runtest.py run locally (needed to comment out a test for that to work)

* work on plasma tests

* more fixes

* fix local scheduler tests

* fix global scheduler test

* more fixes

* fix python 3 bytes vs string

* fix manager tests valgrind

* fix documentation building

* fix linting

* fix c++ linting

* fix linting

* add tests back in

* Install without sudo.

* Set PKG_CONFIG_PATH in build.sh so that Ray can find plasma.

* Install pkg-config

* Link -lpthread, note that find_package(Threads) doesn't seem to work reliably.

* Comment in testGPUIDs in runtest.py.

* Set PKG_CONFIG_PATH when building pyarrow.

* Pull apache/arrow and not pcmoritz/arrow.

* Fix installation in docker image.

* adapt to changes of the plasma api

* Fix installation of pyarrow module.

* Fix linting.

* Use correct python executable to build pyarrow.
This commit is contained in:
Philipp Moritz
2017-07-31 21:04:15 -07:00
committed by Robert Nishihara
parent dfcd399dbb
commit c3b39b4d86
64 changed files with 470 additions and 5761 deletions
+74 -450
View File
@@ -3,16 +3,20 @@ from __future__ import division
from __future__ import print_function
import numpy as np
from numpy.testing import assert_equal
import os
import random
import signal
import subprocess
import sys
import threading
import time
import unittest
import ray.plasma as plasma
from ray.plasma.utils import (random_object_id, generate_metadata,
import pyarrow as pa
import pyarrow.plasma as plasma
import ray
from ray.plasma.utils import (random_object_id,
create_object_with_id, create_object)
from ray import services
@@ -20,6 +24,10 @@ USE_VALGRIND = False
PLASMA_STORE_MEMORY = 1000000000
def random_name():
return str(random.randint(0, 99999999))
def assert_get_object_equal(unit_test, client1, client2, object_id,
memory_buffer=None, metadata=None):
client1_buff = client1.get([object_id])[0]
@@ -29,473 +37,88 @@ def assert_get_object_equal(unit_test, client1, client2, object_id,
unit_test.assertEqual(len(client1_buff), len(client2_buff))
unit_test.assertEqual(len(client1_metadata), len(client2_metadata))
# Check that the buffers from the two clients are the same.
unit_test.assertTrue(plasma.buffers_equal(client1_buff, client2_buff))
assert_equal(np.frombuffer(client1_buff, dtype="uint8"),
np.frombuffer(client2_buff, dtype="uint8"))
# Check that the metadata buffers from the two clients are the same.
unit_test.assertTrue(plasma.buffers_equal(client1_metadata,
client2_metadata))
assert_equal(np.frombuffer(client1_metadata, dtype="uint8"),
np.frombuffer(client2_metadata, dtype="uint8"))
# If a reference buffer was provided, check that it is the same as well.
if memory_buffer is not None:
unit_test.assertTrue(plasma.buffers_equal(memory_buffer, client1_buff))
assert_equal(np.frombuffer(memory_buffer, dtype="uint8"),
np.frombuffer(client1_buff, dtype="uint8"))
# If reference metadata was provided, check that it is the same as well.
if metadata is not None:
unit_test.assertTrue(plasma.buffers_equal(metadata, client1_metadata))
assert_equal(np.frombuffer(metadata, dtype="uint8"),
np.frombuffer(client1_metadata, dtype="uint8"))
class TestPlasmaClient(unittest.TestCase):
DEFAULT_PLASMA_STORE_MEMORY = 10 ** 9
def setUp(self):
# Start Plasma store.
plasma_store_name, self.p = plasma.start_plasma_store(
use_valgrind=USE_VALGRIND)
# Connect to Plasma.
self.plasma_client = plasma.PlasmaClient(plasma_store_name, None, 64)
# For the eviction test
self.plasma_client2 = plasma.PlasmaClient(plasma_store_name, None, 0)
def tearDown(self):
# Check that the Plasma store is still alive.
self.assertEqual(self.p.poll(), None)
# Kill the plasma store process.
if USE_VALGRIND:
self.p.send_signal(signal.SIGTERM)
self.p.wait()
if self.p.returncode != 0:
os._exit(-1)
else:
self.p.kill()
def start_plasma_store(plasma_store_memory=DEFAULT_PLASMA_STORE_MEMORY,
use_valgrind=False, use_profiler=False,
stdout_file=None, stderr_file=None):
"""Start a plasma store process.
Args:
use_valgrind (bool): True if the plasma store should be started inside
of valgrind. If this is True, use_profiler must be False.
use_profiler (bool): True if the plasma store should be started inside
a profiler. If this is True, use_valgrind must be False.
stdout_file: A file handle opened for writing to redirect stdout to. If
no redirection should happen, then this should be None.
stderr_file: A file handle opened for writing to redirect stderr to. If
no redirection should happen, then this should be None.
Return:
A tuple of the name of the plasma store socket and the process ID of
the plasma store process.
"""
if use_valgrind and use_profiler:
raise Exception("Cannot use valgrind and profiler at the same time.")
plasma_store_executable = os.path.join(pa.__path__[0], "plasma_store")
plasma_store_name = "/tmp/plasma_store{}".format(random_name())
command = [plasma_store_executable,
"-s", plasma_store_name,
"-m", str(plasma_store_memory)]
if use_valgrind:
pid = subprocess.Popen(["valgrind",
"--track-origins=yes",
"--leak-check=full",
"--show-leak-kinds=all",
"--leak-check-heuristics=stdstring",
"--error-exitcode=1"] + command,
stdout=stdout_file, stderr=stderr_file)
time.sleep(1.0)
elif use_profiler:
pid = subprocess.Popen(["valgrind", "--tool=callgrind"] + command,
stdout=stdout_file, stderr=stderr_file)
time.sleep(1.0)
else:
pid = subprocess.Popen(command, stdout=stdout_file, stderr=stderr_file)
time.sleep(0.1)
return plasma_store_name, pid
def test_create(self):
# Create an object id string.
object_id = random_object_id()
# Create a new buffer and write to it.
length = 50
memory_buffer = self.plasma_client.create(object_id, length)
for i in range(length):
memory_buffer[i] = chr(i % 256)
# Seal the object.
self.plasma_client.seal(object_id)
# Get the object.
memory_buffer = self.plasma_client.get([object_id])[0]
for i in range(length):
self.assertEqual(memory_buffer[i], chr(i % 256))
def test_create_with_metadata(self):
for length in range(1000):
# Create an object id string.
object_id = random_object_id()
# Create a random metadata string.
metadata = generate_metadata(length)
# Create a new buffer and write to it.
memory_buffer = self.plasma_client.create(object_id, length,
metadata)
for i in range(length):
memory_buffer[i] = chr(i % 256)
# Seal the object.
self.plasma_client.seal(object_id)
# Get the object.
memory_buffer = self.plasma_client.get([object_id])[0]
for i in range(length):
self.assertEqual(memory_buffer[i], chr(i % 256))
# Get the metadata.
metadata_buffer = self.plasma_client.get_metadata([object_id])[0]
self.assertEqual(len(metadata), len(metadata_buffer))
for i in range(len(metadata)):
self.assertEqual(chr(metadata[i]), metadata_buffer[i])
def test_create_existing(self):
# This test is partially used to test the code path in which we create
# an object with an ID that already exists
length = 100
for _ in range(1000):
object_id = random_object_id()
self.plasma_client.create(object_id, length,
generate_metadata(length))
try:
self.plasma_client.create(object_id, length,
generate_metadata(length))
except plasma.plasma_object_exists_error as e:
pass
else:
self.assertTrue(False)
def test_get(self):
num_object_ids = 100
# Test timing out of get with various timeouts.
for timeout in [0, 10, 100, 1000]:
object_ids = [random_object_id() for _ in range(num_object_ids)]
results = self.plasma_client.get(object_ids, timeout_ms=timeout)
self.assertEqual(results, num_object_ids * [None])
data_buffers = []
metadata_buffers = []
for i in range(num_object_ids):
if i % 2 == 0:
data_buffer, metadata_buffer = create_object_with_id(
self.plasma_client, object_ids[i], 2000, 2000)
data_buffers.append(data_buffer)
metadata_buffers.append(metadata_buffer)
# Test timing out from some but not all get calls with various
# timeouts.
for timeout in [0, 10, 100, 1000]:
data_results = self.plasma_client.get(object_ids,
timeout_ms=timeout)
for i in range(num_object_ids):
if i % 2 == 0:
self.assertTrue(plasma.buffers_equal(data_buffers[i // 2],
data_results[i]))
else:
self.assertIsNone(results[i])
def test_store_full(self):
# The store is started with 1GB, so make sure that create throws an
# exception when it is full.
def assert_create_raises_plasma_full(unit_test, size):
partial_size = np.random.randint(size)
try:
_, memory_buffer, _ = create_object(unit_test.plasma_client,
partial_size,
size - partial_size)
except plasma.plasma_out_of_memory_error as e:
pass
else:
# For some reason the above didn't throw an exception, so fail.
unit_test.assertTrue(False)
# Create a list to keep some of the buffers in scope.
memory_buffers = []
_, memory_buffer, _ = create_object(self.plasma_client, 5 * 10 ** 8, 0)
memory_buffers.append(memory_buffer)
# Remaining space is 5 * 10 ** 8. Make sure that we can't create an
# object of size 5 * 10 ** 8 + 1, but we can create one of size
# 2 * 10 ** 8.
assert_create_raises_plasma_full(self, 5 * 10 ** 8 + 1)
_, memory_buffer, _ = create_object(self.plasma_client, 2 * 10 ** 8, 0)
del memory_buffer
_, memory_buffer, _ = create_object(self.plasma_client, 2 * 10 ** 8, 0)
del memory_buffer
assert_create_raises_plasma_full(self, 5 * 10 ** 8 + 1)
_, memory_buffer, _ = create_object(self.plasma_client, 2 * 10 ** 8, 0)
memory_buffers.append(memory_buffer)
# Remaining space is 3 * 10 ** 8.
assert_create_raises_plasma_full(self, 3 * 10 ** 8 + 1)
_, memory_buffer, _ = create_object(self.plasma_client, 10 ** 8, 0)
memory_buffers.append(memory_buffer)
# Remaining space is 2 * 10 ** 8.
assert_create_raises_plasma_full(self, 2 * 10 ** 8 + 1)
def test_contains(self):
fake_object_ids = [random_object_id() for _ in range(100)]
real_object_ids = [random_object_id() for _ in range(100)]
for object_id in real_object_ids:
self.assertFalse(self.plasma_client.contains(object_id))
self.plasma_client.create(object_id, 100)
self.plasma_client.seal(object_id)
self.assertTrue(self.plasma_client.contains(object_id))
for object_id in fake_object_ids:
self.assertFalse(self.plasma_client.contains(object_id))
for object_id in real_object_ids:
self.assertTrue(self.plasma_client.contains(object_id))
def test_hash(self):
# Check the hash of an object that doesn't exist.
object_id1 = random_object_id()
self.plasma_client.hash(object_id1)
length = 1000
# Create a random object, and check that the hash function always
# returns the same value.
metadata = generate_metadata(length)
memory_buffer = self.plasma_client.create(object_id1, length, metadata)
for i in range(length):
memory_buffer[i] = chr(i % 256)
self.plasma_client.seal(object_id1)
self.assertEqual(self.plasma_client.hash(object_id1),
self.plasma_client.hash(object_id1))
# Create a second object with the same value as the first, and check
# that their hashes are equal.
object_id2 = random_object_id()
memory_buffer = self.plasma_client.create(object_id2, length, metadata)
for i in range(length):
memory_buffer[i] = chr(i % 256)
self.plasma_client.seal(object_id2)
self.assertEqual(self.plasma_client.hash(object_id1),
self.plasma_client.hash(object_id2))
# Create a third object with a different value from the first two, and
# check that its hash is different.
object_id3 = random_object_id()
metadata = generate_metadata(length)
memory_buffer = self.plasma_client.create(object_id3, length, metadata)
for i in range(length):
memory_buffer[i] = chr((i + 1) % 256)
self.plasma_client.seal(object_id3)
self.assertNotEqual(self.plasma_client.hash(object_id1),
self.plasma_client.hash(object_id3))
# Create a fourth object with the same value as the third, but
# different metadata. Check that its hash is different from any of the
# previous three.
object_id4 = random_object_id()
metadata4 = generate_metadata(length)
memory_buffer = self.plasma_client.create(object_id4, length,
metadata4)
for i in range(length):
memory_buffer[i] = chr((i + 1) % 256)
self.plasma_client.seal(object_id4)
self.assertNotEqual(self.plasma_client.hash(object_id1),
self.plasma_client.hash(object_id4))
self.assertNotEqual(self.plasma_client.hash(object_id3),
self.plasma_client.hash(object_id4))
def test_many_hashes(self):
hashes = []
length = 2 ** 10
for i in range(256):
object_id = random_object_id()
memory_buffer = self.plasma_client.create(object_id, length)
for j in range(length):
memory_buffer[j] = chr(i)
self.plasma_client.seal(object_id)
hashes.append(self.plasma_client.hash(object_id))
# Create objects of varying length. Each pair has two bits different.
for i in range(length):
object_id = random_object_id()
memory_buffer = self.plasma_client.create(object_id, length)
for j in range(length):
memory_buffer[j] = chr(0)
memory_buffer[i] = chr(1)
self.plasma_client.seal(object_id)
hashes.append(self.plasma_client.hash(object_id))
# Create objects of varying length, all with value 0.
for i in range(length):
object_id = random_object_id()
memory_buffer = self.plasma_client.create(object_id, i)
for j in range(i):
memory_buffer[j] = chr(0)
self.plasma_client.seal(object_id)
hashes.append(self.plasma_client.hash(object_id))
# Check that all hashes were unique.
self.assertEqual(len(set(hashes)), 256 + length + length)
# def test_individual_delete(self):
# length = 100
# # Create an object id string.
# object_id = random_object_id()
# # Create a random metadata string.
# metadata = generate_metadata(100)
# # Create a new buffer and write to it.
# memory_buffer = self.plasma_client.create(object_id, length, metadata)
# for i in range(length):
# memory_buffer[i] = chr(i % 256)
# # Seal the object.
# self.plasma_client.seal(object_id)
# # Check that the object is present.
# self.assertTrue(self.plasma_client.contains(object_id))
# # Delete the object.
# self.plasma_client.delete(object_id)
# # Make sure the object is no longer present.
# self.assertFalse(self.plasma_client.contains(object_id))
#
# def test_delete(self):
# # Create some objects.
# object_ids = [random_object_id() for _ in range(100)]
# for object_id in object_ids:
# length = 100
# # Create a random metadata string.
# metadata = generate_metadata(100)
# # Create a new buffer and write to it.
# memory_buffer = self.plasma_client.create(object_id, length,
# metadata)
# for i in range(length):
# memory_buffer[i] = chr(i % 256)
# # Seal the object.
# self.plasma_client.seal(object_id)
# # Check that the object is present.
# self.assertTrue(self.plasma_client.contains(object_id))
#
# # Delete the objects and make sure they are no longer present.
# for object_id in object_ids:
# # Delete the object.
# self.plasma_client.delete(object_id)
# # Make sure the object is no longer present.
# self.assertFalse(self.plasma_client.contains(object_id))
def test_illegal_functionality(self):
# Create an object id string.
object_id = random_object_id()
# Create a new buffer and write to it.
length = 1000
memory_buffer = self.plasma_client.create(object_id, length)
# Make sure we cannot access memory out of bounds.
self.assertRaises(Exception, lambda: memory_buffer[length])
# Seal the object.
self.plasma_client.seal(object_id)
# This test is commented out because it currently fails.
# # Make sure the object is ready only now.
# def illegal_assignment():
# memory_buffer[0] = chr(0)
# self.assertRaises(Exception, illegal_assignment)
# Get the object.
memory_buffer = self.plasma_client.get([object_id])[0]
# Make sure the object is read only.
def illegal_assignment():
memory_buffer[0] = chr(0)
self.assertRaises(Exception, illegal_assignment)
def test_evict(self):
client = self.plasma_client2
object_id1 = random_object_id()
b1 = client.create(object_id1, 1000)
client.seal(object_id1)
del b1
self.assertEqual(client.evict(1), 1000)
object_id2 = random_object_id()
object_id3 = random_object_id()
b2 = client.create(object_id2, 999)
b3 = client.create(object_id3, 998)
client.seal(object_id3)
del b3
self.assertEqual(client.evict(1000), 998)
object_id4 = random_object_id()
b4 = client.create(object_id4, 997)
client.seal(object_id4)
del b4
client.seal(object_id2)
del b2
self.assertEqual(client.evict(1), 997)
self.assertEqual(client.evict(1), 999)
object_id5 = random_object_id()
object_id6 = random_object_id()
object_id7 = random_object_id()
b5 = client.create(object_id5, 996)
b6 = client.create(object_id6, 995)
b7 = client.create(object_id7, 994)
client.seal(object_id5)
client.seal(object_id6)
client.seal(object_id7)
del b5
del b6
del b7
self.assertEqual(client.evict(2000), 996 + 995 + 994)
def test_subscribe(self):
# Subscribe to notifications from the Plasma Store.
self.plasma_client.subscribe()
for i in [1, 10, 100, 1000, 10000, 100000]:
object_ids = [random_object_id() for _ in range(i)]
metadata_sizes = [np.random.randint(1000) for _ in range(i)]
data_sizes = [np.random.randint(1000) for _ in range(i)]
for j in range(i):
self.plasma_client.create(
object_ids[j], size=data_sizes[j],
metadata=bytearray(np.random.bytes(metadata_sizes[j])))
self.plasma_client.seal(object_ids[j])
# Check that we received notifications for all of the objects.
for j in range(i):
notification_info = self.plasma_client.get_next_notification()
recv_objid, recv_dsize, recv_msize = notification_info
self.assertEqual(object_ids[j], recv_objid)
self.assertEqual(data_sizes[j], recv_dsize)
self.assertEqual(metadata_sizes[j], recv_msize)
def test_subscribe_deletions(self):
# Subscribe to notifications from the Plasma Store. We use
# plasma_client2 to make sure that all used objects will get evicted
# properly.
self.plasma_client2.subscribe()
for i in [1, 10, 100, 1000, 10000, 100000]:
object_ids = [random_object_id() for _ in range(i)]
# Add 1 to the sizes to make sure we have nonzero object sizes.
metadata_sizes = [np.random.randint(1000) + 1 for _ in range(i)]
data_sizes = [np.random.randint(1000) + 1 for _ in range(i)]
for j in range(i):
x = self.plasma_client2.create(
object_ids[j], size=data_sizes[j],
metadata=bytearray(np.random.bytes(metadata_sizes[j])))
self.plasma_client2.seal(object_ids[j])
del x
# Check that we received notifications for creating all of the
# objects.
for j in range(i):
notification_info = self.plasma_client2.get_next_notification()
recv_objid, recv_dsize, recv_msize = notification_info
self.assertEqual(object_ids[j], recv_objid)
self.assertEqual(data_sizes[j], recv_dsize)
self.assertEqual(metadata_sizes[j], recv_msize)
# Check that we receive notifications for deleting all objects, as
# we evict them.
for j in range(i):
self.assertEqual(self.plasma_client2.evict(1),
data_sizes[j] + metadata_sizes[j])
notification_info = self.plasma_client2.get_next_notification()
recv_objid, recv_dsize, recv_msize = notification_info
self.assertEqual(object_ids[j], recv_objid)
self.assertEqual(-1, recv_dsize)
self.assertEqual(-1, recv_msize)
# Test multiple deletion notifications. The first 9 object IDs have
# size 0, and the last has a nonzero size. When Plasma evicts 1 byte,
# it will evict all objects, so we should receive deletion
# notifications for each.
num_object_ids = 10
object_ids = [random_object_id() for _ in range(num_object_ids)]
metadata_sizes = [0] * (num_object_ids - 1)
data_sizes = [0] * (num_object_ids - 1)
metadata_sizes.append(np.random.randint(1000))
data_sizes.append(np.random.randint(1000))
for i in range(num_object_ids):
x = self.plasma_client2.create(
object_ids[i], size=data_sizes[i],
metadata=bytearray(np.random.bytes(metadata_sizes[i])))
self.plasma_client2.seal(object_ids[i])
del x
for i in range(num_object_ids):
notification_info = self.plasma_client2.get_next_notification()
recv_objid, recv_dsize, recv_msize = notification_info
self.assertEqual(object_ids[i], recv_objid)
self.assertEqual(data_sizes[i], recv_dsize)
self.assertEqual(metadata_sizes[i], recv_msize)
self.assertEqual(self.plasma_client2.evict(1),
data_sizes[-1] + metadata_sizes[-1])
for i in range(num_object_ids):
notification_info = self.plasma_client2.get_next_notification()
recv_objid, recv_dsize, recv_msize = notification_info
self.assertEqual(object_ids[i], recv_objid)
self.assertEqual(-1, recv_dsize)
self.assertEqual(-1, recv_msize)
# Plasma client tests were moved into arrow
class TestPlasmaManager(unittest.TestCase):
def setUp(self):
# Start two PlasmaStores.
store_name1, self.p2 = plasma.start_plasma_store(
store_name1, self.p2 = start_plasma_store(
use_valgrind=USE_VALGRIND)
store_name2, self.p3 = plasma.start_plasma_store(
store_name2, self.p3 = start_plasma_store(
use_valgrind=USE_VALGRIND)
# Start a Redis server.
redis_address, _ = services.start_redis("127.0.0.1")
# Start two PlasmaManagers.
manager_name1, self.p4, self.port1 = plasma.start_plasma_manager(
manager_name1, self.p4, self.port1 = ray.plasma.start_plasma_manager(
store_name1, redis_address, use_valgrind=USE_VALGRIND)
manager_name2, self.p5, self.port2 = plasma.start_plasma_manager(
manager_name2, self.p5, self.port2 = ray.plasma.start_plasma_manager(
store_name2, redis_address, use_valgrind=USE_VALGRIND)
# Connect two PlasmaClients.
self.client1 = plasma.PlasmaClient(store_name1, manager_name1)
self.client2 = plasma.PlasmaClient(store_name2, manager_name2)
self.client1 = plasma.connect(store_name1, manager_name1, 64)
self.client2 = plasma.connect(store_name2, manager_name2, 64)
# Store the processes that will be explicitly killed during tearDown so
# that a test case can remove ones that will be killed during the test.
@@ -719,7 +342,8 @@ class TestPlasmaManager(unittest.TestCase):
# Make sure that wait returns when the requested number of object IDs
# are available and does not wait for all object IDs to be available.
object_ids = [random_object_id() for _ in range(9)] + [20 * b'\x00']
object_ids = [random_object_id() for _ in range(9)] + \
[plasma.ObjectID(20 * b'\x00')]
object_ids_perm = object_ids[:]
random.shuffle(object_ids_perm)
for i in range(10):
@@ -812,17 +436,17 @@ class TestPlasmaManagerRecovery(unittest.TestCase):
def setUp(self):
# Start a Plasma store.
self.store_name, self.p2 = plasma.start_plasma_store(
self.store_name, self.p2 = start_plasma_store(
use_valgrind=USE_VALGRIND)
# Start a Redis server.
self.redis_address, _ = services.start_redis("127.0.0.1")
# Start a PlasmaManagers.
manager_name, self.p3, self.port1 = plasma.start_plasma_manager(
manager_name, self.p3, self.port1 = ray.plasma.start_plasma_manager(
self.store_name,
self.redis_address,
use_valgrind=USE_VALGRIND)
# Connect a PlasmaClient.
self.client = plasma.PlasmaClient(self.store_name, manager_name)
self.client = plasma.connect(self.store_name, manager_name, 64)
# Store the processes that will be explicitly killed during tearDown so
# that a test case can remove ones that will be killed during the test.
@@ -865,12 +489,12 @@ class TestPlasmaManagerRecovery(unittest.TestCase):
self.assertEqual(waiting, [])
# Start a second plasma manager attached to the same store.
manager_name, self.p5, self.port2 = plasma.start_plasma_manager(
manager_name, self.p5, self.port2 = ray.plasma.start_plasma_manager(
self.store_name, self.redis_address, use_valgrind=USE_VALGRIND)
self.processes_to_kill = [self.p5] + self.processes_to_kill
# Check that the second manager knows about existing objects.
client2 = plasma.PlasmaClient(self.store_name, manager_name)
client2 = plasma.connect(self.store_name, manager_name, 64)
ready, waiting = [], object_ids
while True:
ready, waiting = client2.wait(object_ids, num_returns=num_objects,