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from __future__ import annotations
import pytest
pytest.importorskip("asyncssh")
import sys
import dask
from distributed import Client
from distributed.compatibility import MACOS, WINDOWS
from distributed.deploy.ssh import SSHCluster
from distributed.utils_test import gen_test
pytestmark = [
pytest.mark.xfail(MACOS, reason="very high flakiness; see distributed/issues/4543"),
pytest.mark.skipif(WINDOWS, reason="no CI support; see distributed/issues/4509"),
]
def test_ssh_hosts_None():
with pytest.raises(ValueError):
SSHCluster(hosts=None)
def test_ssh_hosts_empty_list():
with pytest.raises(ValueError):
SSHCluster(hosts=[])
@gen_test()
async def test_ssh_cluster_raises_if_asyncssh_not_installed(monkeypatch):
monkeypatch.setitem(sys.modules, "asyncssh", None)
with pytest.raises(
(RuntimeError, ImportError), match="SSHCluster requires the `asyncssh` package"
):
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=[dict(known_hosts=None)] * 3,
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
) as cluster:
assert not cluster
@gen_test()
async def test_basic():
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=dict(known_hosts=None),
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
) as cluster:
assert len(cluster.workers) == 2
async with Client(cluster, asynchronous=True) as client:
result = await client.submit(lambda x: x + 1, 10)
assert result == 11
assert not cluster._supports_scaling
assert "SSH" in repr(cluster)
@gen_test()
async def test_n_workers():
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=dict(known_hosts=None),
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s", "n_workers": 2},
) as cluster:
assert len(cluster.workers) == 2
async with Client(cluster, asynchronous=True) as client:
await client.wait_for_workers(4)
result = await client.submit(lambda x: x + 1, 10)
assert result == 11
assert not cluster._supports_scaling
assert "SSH" in repr(cluster)
@gen_test()
async def test_nprocs_attribute_is_deprecated():
async with SSHCluster(
["127.0.0.1"] * 2,
connect_options=dict(known_hosts=None),
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
) as cluster:
assert len(cluster.workers) == 1
worker = cluster.workers[0]
assert worker.n_workers == 1
with pytest.warns(FutureWarning, match="renamed to n_workers"):
assert worker.nprocs == 1
with pytest.warns(FutureWarning, match="renamed to n_workers"):
worker.nprocs = 3
assert worker.n_workers == 3
@gen_test()
async def test_ssh_nprocs_renamed_to_n_workers():
with pytest.warns(FutureWarning, match="renamed to n_workers"):
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=dict(known_hosts=None),
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s", "nprocs": 2},
) as cluster:
assert len(cluster.workers) == 2
async with Client(cluster, asynchronous=True) as client:
await client.wait_for_workers(4)
@gen_test()
async def test_ssh_n_workers_with_nprocs_is_an_error():
cluster = SSHCluster(
["127.0.0.1"] * 3,
connect_options=dict(known_hosts=None),
asynchronous=True,
scheduler_options={},
worker_options={"n_workers": 2, "nprocs": 2},
)
try:
with pytest.raises(ValueError, match="Both nprocs and n_workers"):
async with cluster:
pass
finally:
# FIXME: SSHCluster leaks if SSHCluster.__aenter__ raises
await cluster.close()
@gen_test()
async def test_keywords():
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=dict(known_hosts=None),
asynchronous=True,
worker_options={
"nthreads": 2,
"memory_limit": "2 GiB",
"death_timeout": "5s",
},
scheduler_options={"idle_timeout": "10s"},
) as cluster:
async with Client(cluster, asynchronous=True) as client:
assert (
await client.run_on_scheduler(
lambda dask_scheduler: dask_scheduler.idle_timeout
)
) == 10
d = client.scheduler_info()["workers"]
assert all(v["nthreads"] == 2 for v in d.values())
@pytest.mark.avoid_ci
def test_defer_to_old(loop):
with pytest.warns(
UserWarning,
match=r"Note that the SSHCluster API has been replaced\. "
r"We're routing you to the older implementation\. "
r"This will be removed in the future",
):
c = SSHCluster(
scheduler_addr="127.0.0.1",
scheduler_port=7437,
worker_addrs=["127.0.0.1", "127.0.0.1"],
)
with c:
from distributed.deploy.old_ssh import SSHCluster as OldSSHCluster
assert isinstance(c, OldSSHCluster)
@pytest.mark.avoid_ci
def test_old_ssh_with_local_dir(loop):
from distributed.deploy.old_ssh import SSHCluster as OldSSHCluster
with OldSSHCluster(
scheduler_addr="127.0.0.1",
scheduler_port=7437,
worker_addrs=["127.0.0.1", "127.0.0.1"],
local_directory="/tmp",
) as c:
assert len(c.workers) == 2
with Client(c) as client:
result = client.submit(lambda x: x + 1, 10)
result = result.result()
assert result == 11
@gen_test()
async def test_config_inherited_by_subprocess(loop):
def f(x):
return dask.config.get("foo") + 1
with dask.config.set(foo=100):
async with SSHCluster(
["127.0.0.1"] * 2,
connect_options=dict(known_hosts=None),
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
) as cluster:
async with Client(cluster, asynchronous=True) as client:
result = await client.submit(f, 1)
assert result == 101
@gen_test()
async def test_unimplemented_options():
with pytest.raises(Exception):
async with SSHCluster(
["127.0.0.1"] * 3,
connect_kwargs=dict(known_hosts=None),
asynchronous=True,
worker_kwargs={
"nthreads": 2,
"memory_limit": "2 GiB",
"death_timeout": "5s",
"unimplemented_option": 2,
},
scheduler_kwargs={"idle_timeout": "5s"},
) as cluster:
assert cluster
@gen_test()
async def test_list_of_connect_options():
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=[dict(known_hosts=None)] * 3,
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
) as cluster:
assert len(cluster.workers) == 2
async with Client(cluster, asynchronous=True) as client:
result = await client.submit(lambda x: x + 1, 10)
assert result == 11
assert not cluster._supports_scaling
assert "SSH" in repr(cluster)
@gen_test()
async def test_list_of_connect_options_raises():
with pytest.raises(RuntimeError):
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=[dict(known_hosts=None)] * 4, # Mismatch in length 4 != 3
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
) as _:
pass
@gen_test()
async def test_remote_python():
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=[dict(known_hosts=None)] * 3,
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
remote_python=sys.executable,
) as cluster:
assert cluster.workers[0].remote_python == sys.executable
@gen_test()
async def test_remote_python_as_dict():
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=[dict(known_hosts=None)] * 3,
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
remote_python=[sys.executable] * 3,
) as cluster:
assert cluster.workers[0].remote_python == sys.executable
@gen_test()
async def test_list_of_remote_python_raises():
with pytest.raises(RuntimeError):
async with SSHCluster(
["127.0.0.1"] * 3,
connect_options=[dict(known_hosts=None)] * 3,
asynchronous=True,
scheduler_options={"idle_timeout": "5s"},
worker_options={"death_timeout": "5s"},
remote_python=[sys.executable] * 4, # Mismatch in length 4 != 3
) as _:
pass
|
