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from __future__ import annotations
import random
from concurrent.futures import (
FIRST_COMPLETED,
FIRST_EXCEPTION,
Future,
TimeoutError,
as_completed,
wait,
)
from time import sleep
import pytest
from tlz import take
from distributed.event import Event
from distributed.metrics import time
from distributed.utils import CancelledError
from distributed.utils_test import inc, slowadd, slowinc, throws, varying
def number_of_processing_tasks(client):
return sum(len(v) for k, v in client.processing().items())
def test_submit(client):
with client.get_executor() as e:
f1 = e.submit(slowadd, 1, 2)
assert isinstance(f1, Future)
f2 = e.submit(slowadd, 3, y=4)
f3 = e.submit(throws, "foo")
f4 = e.submit(slowadd, x=5, y=6)
assert f1.result() == 3
assert f2.result() == 7
with pytest.raises(RuntimeError):
f3.result()
assert f4.result() == 11
def test_as_completed(client):
with client.get_executor() as e:
N = 10
fs = [e.submit(slowinc, i, delay=0.02) for i in range(N)]
expected = set(range(1, N + 1))
for f in as_completed(fs):
res = f.result()
assert res in expected
expected.remove(res)
assert not expected
def test_wait(client):
def block_inc(x, ev):
ev.wait()
return x + 1
with client.get_executor(pure=False) as e:
ev = Event()
N = 10
fs = [e.submit(block_inc, i, ev, pure=False) for i in range(N)]
res = wait(fs, timeout=0.01)
assert len(res.not_done) > 0
ev.set()
res = wait(fs)
assert len(res.not_done) == 0
assert res.done == set(fs)
ev.clear()
nthreads = sum(client.nthreads().values())
fs = [e.submit(block_inc, i, ev, pure=False) for i in range(nthreads - 1)]
fs.append(e.submit(inc, 0))
fs.extend([e.submit(block_inc, i, ev, pure=False) for i in range(nthreads, N)])
res = wait(fs, return_when=FIRST_COMPLETED)
assert len(res.not_done) > 0
assert len(res.done) >= 1
ev.set()
res = wait(fs)
assert len(res.not_done) == 0
assert res.done == set(fs)
ev.clear()
fs = [e.submit(inc, i) for i in range(N)]
fs += [e.submit(throws, None)]
fs += [e.submit(block_inc, i, ev, pure=False) for i in range(N)]
res = wait(fs, return_when=FIRST_EXCEPTION)
assert any(f.exception() for f in res.done)
assert res.not_done
errors = []
for fs in res.done:
try:
fs.result()
except RuntimeError as e:
errors.append(e)
assert len(errors) == 1
assert "hello" in str(errors[0])
ev.set()
def test_cancellation(client):
with client.get_executor(pure=False) as e:
fut = e.submit(sleep, 2.0)
start = time()
while number_of_processing_tasks(client) == 0:
assert time() < start + 30
sleep(0.01)
assert not fut.done()
fut.cancel()
assert fut.cancelled()
start = time()
while number_of_processing_tasks(client) != 0:
assert time() < start + 30
sleep(0.01)
with pytest.raises(CancelledError):
fut.result()
def test_cancellation_wait(client):
with client.get_executor(pure=False) as e:
fs = [e.submit(slowinc, i, delay=0.2) for i in range(10)]
fs[3].cancel()
res = wait(fs, return_when=FIRST_COMPLETED, timeout=30)
assert len(res.not_done) > 0
assert len(res.done) >= 1
assert fs[3] in res.done
assert fs[3].cancelled()
def test_cancellation_as_completed(client):
with client.get_executor(pure=False) as e:
fs = [e.submit(slowinc, i, delay=0.2) for i in range(10)]
fs[3].cancel()
fs[8].cancel()
n_cancelled = sum(f.cancelled() for f in as_completed(fs, timeout=30))
assert n_cancelled == 2
@pytest.mark.slow()
def test_map(client):
with client.get_executor() as e:
N = 10
it = e.map(inc, range(N))
expected = set(range(1, N + 1))
for x in it:
expected.remove(x)
assert not expected
with client.get_executor(pure=False) as e:
N = 10
it = e.map(slowinc, range(N), [0.3] * N, timeout=1.2)
results = []
with pytest.raises(TimeoutError):
for x in it:
results.append(x)
assert 2 <= len(results) < 7
with client.get_executor(pure=False) as e:
N = 10
# Not consuming the iterator will cancel remaining tasks
it = e.map(slowinc, range(N), [0.3] * N)
for _ in take(2, it):
pass
# Some tasks still processing
assert number_of_processing_tasks(client) > 0
# Garbage collect the iterator => remaining tasks are cancelled
del it
sleep(0.5)
assert number_of_processing_tasks(client) == 0
def get_random():
return random.random()
def test_pure(client):
N = 10
with client.get_executor() as e:
fs = [e.submit(get_random) for i in range(N)]
res = [fut.result() for fut in as_completed(fs)]
assert len(set(res)) < len(res)
with client.get_executor(pure=False) as e:
fs = [e.submit(get_random) for i in range(N)]
res = [fut.result() for fut in as_completed(fs)]
assert len(set(res)) == len(res)
def test_workers(client, s, a, b):
N = 10
with client.get_executor(workers=[b["address"]]) as e:
fs = [e.submit(slowinc, i) for i in range(N)]
wait(fs)
has_what = client.has_what()
assert not has_what.get(a["address"])
assert len(has_what[b["address"]]) == N
def test_unsupported_arguments(client, s, a, b):
with pytest.raises(TypeError) as excinfo:
client.get_executor(workers=[b["address"]], foo=1, bar=2)
assert "unsupported arguments to ClientExecutor: ['bar', 'foo']" in str(
excinfo.value
)
def test_retries(client):
args = [ZeroDivisionError("one"), ZeroDivisionError("two"), 42]
with client.get_executor(retries=5, pure=False) as e:
future = e.submit(varying(args))
assert future.result() == 42
with client.get_executor(retries=4) as e:
future = e.submit(varying(args))
result = future.result()
assert result == 42
with client.get_executor(retries=2) as e:
future = e.submit(varying(args))
with pytest.raises(ZeroDivisionError, match="two"):
res = future.result()
with client.get_executor(retries=0) as e:
future = e.submit(varying(args))
with pytest.raises(ZeroDivisionError, match="one"):
res = future.result()
def test_shutdown_wait(client):
# shutdown(wait=True) waits for pending tasks to finish
e = client.get_executor()
start = time()
fut = e.submit(sleep, 1.0)
e.shutdown()
assert time() >= start + 1.0
sleep(0.1) # wait for future outcome to propagate
assert fut.done()
fut.result() # doesn't raise
with pytest.raises(RuntimeError):
e.submit(sleep, 1.0)
def test_shutdown_nowait(client):
# shutdown(wait=False) cancels pending tasks
e = client.get_executor()
start = time()
fut = e.submit(sleep, 5.0)
e.shutdown(wait=False)
assert time() < start + 2.0
sleep(0.1) # wait for future outcome to propagate
assert fut.cancelled()
with pytest.raises(RuntimeError):
e.submit(sleep, 1.0)
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