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test_variable.py
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test_variable.py
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from __future__ import print_function, division, absolute_import
import random
from time import sleep
import sys
import pytest
from tornado import gen
from distributed import Client, Variable, worker_client, Nanny, wait
from distributed.metrics import time
from distributed.utils_test import gen_cluster, inc, div
from distributed.utils_test import client, cluster_fixture, loop # noqa: F401
@gen_cluster(client=True)
def test_variable(c, s, a, b):
x = Variable("x")
xx = Variable("x")
assert x.client is c
future = c.submit(inc, 1)
yield x.set(future)
future2 = yield xx.get()
assert future.key == future2.key
del future, future2
yield gen.sleep(0.1)
assert s.tasks # future still present
x.delete()
start = time()
while s.tasks:
yield gen.sleep(0.01)
assert time() < start + 5
@gen_cluster(client=True)
def test_queue_with_data(c, s, a, b):
x = Variable("x")
xx = Variable("x")
assert x.client is c
yield x.set((1, "hello"))
data = yield xx.get()
assert data == (1, "hello")
def test_sync(client):
future = client.submit(lambda x: x + 1, 10)
x = Variable("x")
xx = Variable("x")
x.set(future)
future2 = xx.get()
assert future2.result() == 11
@gen_cluster()
def test_hold_futures(s, a, b):
c1 = yield Client(s.address, asynchronous=True)
future = c1.submit(lambda x: x + 1, 10)
x1 = Variable("x")
yield x1.set(future)
del x1
yield c1.close()
yield gen.sleep(0.1)
c2 = yield Client(s.address, asynchronous=True)
x2 = Variable("x")
future2 = yield x2.get()
result = yield future2
assert result == 11
yield c2.close()
@gen_cluster(client=True)
def test_timeout(c, s, a, b):
v = Variable("v")
start = time()
with pytest.raises(gen.TimeoutError):
yield v.get(timeout=0.1)
stop = time()
assert 0.1 < stop - start < 2.0
def test_timeout_sync(client):
v = Variable("v")
start = time()
with pytest.raises(gen.TimeoutError):
v.get(timeout=0.1)
stop = time()
assert 0.1 < stop - start < 2.0
@gen_cluster(client=True)
def test_cleanup(c, s, a, b):
v = Variable("v")
vv = Variable("v")
x = c.submit(lambda x: x + 1, 10)
y = c.submit(lambda x: x + 1, 20)
x_key = x.key
yield v.set(x)
del x
yield gen.sleep(0.1)
t_future = xx = vv._get()
yield gen.moment
v._set(y)
future = yield t_future
assert future.key == x_key
result = yield future
assert result == 11
def test_pickleable(client):
v = Variable("v")
def f(x):
v.set(x + 1)
client.submit(f, 10).result()
assert v.get() == 11
@gen_cluster(client=True)
def test_timeout_get(c, s, a, b):
v = Variable("v")
tornado_future = v.get()
vv = Variable("v")
yield vv.set(1)
result = yield tornado_future
assert result == 1
@pytest.mark.skipif(sys.version_info[0] == 2, reason="Multi-client issues")
@pytest.mark.slow
@gen_cluster(client=True, nthreads=[("127.0.0.1", 2)] * 5, Worker=Nanny, timeout=None)
def test_race(c, s, *workers):
NITERS = 50
def f(i):
with worker_client() as c:
v = Variable("x", client=c)
for _ in range(NITERS):
future = v.get()
x = future.result()
y = c.submit(inc, x)
v.set(y)
sleep(0.01 * random.random())
result = v.get().result()
sleep(0.1) # allow fire-and-forget messages to clear
return result
v = Variable("x", client=c)
x = yield c.scatter(1)
yield v.set(x)
futures = c.map(f, range(15))
results = yield c.gather(futures)
assert all(r > NITERS * 0.8 for r in results)
start = time()
while len(s.wants_what["variable-x"]) != 1:
yield gen.sleep(0.01)
assert time() - start < 2
@gen_cluster(client=True)
def test_Future_knows_status_immediately(c, s, a, b):
x = yield c.scatter(123)
v = Variable("x")
yield v.set(x)
c2 = yield Client(s.address, asynchronous=True)
v2 = Variable("x", client=c2)
future = yield v2.get()
assert future.status == "finished"
x = c.submit(div, 1, 0)
yield wait(x)
yield v.set(x)
future2 = yield v2.get()
assert future2.status == "error"
with pytest.raises(Exception):
yield future2
start = time()
while True: # we learn about the true error eventually
try:
yield future2
except ZeroDivisionError:
break
except Exception:
assert time() < start + 5
yield gen.sleep(0.05)
yield c2.close()
@gen_cluster(client=True)
def test_erred_future(c, s, a, b):
future = c.submit(div, 1, 0)
var = Variable()
yield var.set(future)
yield gen.sleep(0.1)
future2 = yield var.get()
with pytest.raises(ZeroDivisionError):
yield future2.result()
exc = yield future2.exception()
assert isinstance(exc, ZeroDivisionError)
def test_future_erred_sync(client):
future = client.submit(div, 1, 0)
var = Variable()
var.set(future)
sleep(0.1)
future2 = var.get()
with pytest.raises(ZeroDivisionError):
future2.result()