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test_gateway.py
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test_gateway.py
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import asyncio
import os
import socket
import signal
import time
import pytest
from cryptography.fernet import Fernet
from traitlets import Integer, Float
from traitlets.config import Config
import dask
from dask_gateway import Gateway, GatewayClusterError, GatewayWarning, GatewayCluster
from dask_gateway_server.app import DaskGateway
from dask_gateway_server.compat import get_running_loop
from dask_gateway_server.objects import ClusterStatus
from dask_gateway_server.managers import ClusterManager
from dask_gateway_server.managers.inprocess import InProcessClusterManager
from dask_gateway_server import options
from .utils import LocalTestingClusterManager, temp_gateway
@pytest.fixture(autouse=True)
def ensure_clusters_closed():
instances = len(GatewayCluster._instances)
for c in list(GatewayCluster._instances):
if not c.asynchronous:
c.close()
assert instances == 0
class SlowStartClusterManager(ClusterManager):
pause_time = Float(0.2, config=True)
state_1 = {"state_1": 1}
state_2 = {"state_2": 2}
state_3 = {"state_3": 3}
stop_cluster_state = None
running = False
async def start_cluster(self):
self.running = True
yield self.state_1
await asyncio.sleep(self.pause_time)
yield self.state_2
await asyncio.sleep(self.pause_time)
yield self.state_3
async def cluster_status(self, cluster_state):
return self.running
async def stop_cluster(self, cluster_state):
self.stop_cluster_state = cluster_state
self.running = False
class ClusterFailsDuringStart(ClusterManager):
fail_stage = Integer(1, config=True)
stop_cluster_state = None
async def start_cluster(self):
for i in range(3):
if i == self.fail_stage:
raise ValueError("Oh No")
yield {"i": i}
async def stop_cluster(self, cluster_state):
self.stop_cluster_state = cluster_state
class ClusterFailsBetweenStartAndConnect(InProcessClusterManager):
status = "starting"
async def start_cluster(self):
yield {"foo": "bar"}
self.status = "failed"
async def cluster_status(self, cluster_state):
return self.status not in ("failed", "stopped")
async def stop_cluster(self, cluster_state):
self.status = "stopped"
class ClusterFailsAfterConnect(InProcessClusterManager):
fail_after = 0.5
async def start_cluster(self):
# Initiate state
loop = get_running_loop()
self.failed = loop.create_future()
self.stop_cluster_called = loop.create_future()
# Start the cluster
async for state in super().start_cluster():
yield state
# Launch a task to kill the cluster soon
self.task_pool.create_task(self.delay_fail_cluster())
async def delay_fail_cluster(self):
await asyncio.sleep(self.fail_after)
self.failed.set_result(True)
async def cluster_status(self, cluster_state):
if self.failed.done():
return False
return await super().cluster_status(cluster_state)
async def stop_cluster(self, cluster_state):
await super().stop_cluster(cluster_state)
self.stop_cluster_called.set_result(True)
class SlowWorkerStartClusterManager(InProcessClusterManager):
pause_time = Float(0.2, config=True)
stop_worker_state = None
async def start_worker(self, worker_name, cluster_state):
for i in range(3):
yield {"i": i}
await asyncio.sleep(self.pause_time)
self.workers[worker_name] = None
async def worker_status(self, worker_name, worker_state, cluster_state):
return worker_name in self.workers
async def stop_worker(self, worker_name, worker_state, cluster_state):
self.stop_worker_state = worker_state
self.workers.pop(worker_name, None)
class WorkerFailsDuringStart(InProcessClusterManager):
fail_stage = Integer(1, config=True)
stop_worker_state = None
async def start_worker(self, worker_name, cluster_state):
for i in range(3):
if i == self.fail_stage:
raise ValueError("Oh No")
yield {"i": i}
async def stop_worker(self, worker_name, worker_state, cluster_state):
self.stop_worker_state = worker_state
class WorkerFailsBetweenStartAndConnect(InProcessClusterManager):
status = "starting"
async def start_worker(self, worker_name, cluster_state):
yield {"foo": "bar"}
self.status = "failed"
async def worker_status(self, worker_name, worker_state, cluster_state):
return self.status not in ("failed", "stopped")
async def stop_worker(self, worker_name, worker_state, cluster_state):
self.status = "stopped"
class WorkerFailsAfterConnect(InProcessClusterManager):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
loop = get_running_loop()
self.stop_worker_called = loop.create_future()
self.worker_connected = loop.create_future()
def on_worker_running(self, *args, **kwargs):
self.worker_connected.set_result(True)
async def stop_worker(self, *args, **kwargs):
await super().stop_worker(*args, **kwargs)
if not self.stop_worker_called.done():
self.stop_worker_called.set_result(True)
@pytest.mark.asyncio
async def test_shutdown_on_startup_error(tmpdir):
# A configuration that will cause a failure at runtime (not init time)
gateway = DaskGateway(
gateway_url="tls://127.0.0.1:0",
private_url="http://127.0.0.1:0",
public_url="http://127.0.0.1:0",
temp_dir=str(tmpdir),
tls_cert=str(tmpdir.join("tls_cert.pem")),
authenticator_class="dask_gateway_server.auth.DummyAuthenticator",
)
with pytest.raises(SystemExit) as exc:
gateway.initialize([])
await gateway.start_or_exit()
assert exc.value.code == 1
def test_db_encrypt_keys_required(tmpdir):
with pytest.raises(ValueError) as exc:
gateway = DaskGateway(
gateway_url="tls://127.0.0.1:0",
private_url="http://127.0.0.1:0",
public_url="http://127.0.0.1:0",
temp_dir=str(tmpdir),
db_url="sqlite:///%s" % tmpdir.join("dask_gateway.sqlite"),
authenticator_class="dask_gateway_server.auth.DummyAuthenticator",
)
gateway.initialize([])
assert "DASK_GATEWAY_ENCRYPT_KEYS" in str(exc.value)
def test_db_encrypt_keys_invalid(tmpdir):
with pytest.raises(ValueError) as exc:
gateway = DaskGateway(
gateway_url="tls://127.0.0.1:0",
private_url="http://127.0.0.1:0",
public_url="http://127.0.0.1:0",
temp_dir=str(tmpdir),
db_url="sqlite:///%s" % tmpdir.join("dask_gateway.sqlite"),
db_encrypt_keys=["abc"],
authenticator_class="dask_gateway_server.auth.DummyAuthenticator",
)
gateway.initialize([])
assert "DASK_GATEWAY_ENCRYPT_KEYS" in str(exc.value)
def test_db_decrypt_keys_from_env(monkeypatch):
keys = [Fernet.generate_key(), Fernet.generate_key()]
val = b";".join(keys).decode()
monkeypatch.setenv("DASK_GATEWAY_ENCRYPT_KEYS", val)
gateway = DaskGateway()
assert gateway.db_encrypt_keys == keys
def test_resume_clusters_forbid_in_memory_db(tmpdir):
with pytest.raises(ValueError) as exc:
DaskGateway(
gateway_url="tls://127.0.0.1:0",
private_url="http://127.0.0.1:0",
public_url="http://127.0.0.1:0",
temp_dir=str(tmpdir),
db_url="sqlite://",
stop_clusters_on_shutdown=False,
authenticator_class="dask_gateway_server.auth.DummyAuthenticator",
)
assert "stop_clusters_on_shutdown" in str(exc.value)
def test_default_urls_from_config():
hostname = socket.gethostname()
gateway = DaskGateway()
gateway.init_server_urls()
assert gateway.public_urls.bind_host == ""
assert gateway.public_urls.connect.hostname == hostname
assert gateway.gateway_urls.bind.scheme == "tls"
assert gateway.gateway_urls.bind_host == ""
assert gateway.gateway_urls.connect.hostname == hostname
assert gateway.private_urls.bind_port != 0
@pytest.mark.asyncio
@pytest.mark.parametrize("start_timeout,state", [(0.1, "state_1"), (0.25, "state_2")])
async def test_slow_cluster_start(tmpdir, start_timeout, state):
config = Config()
config.DaskGateway.cluster_manager_class = SlowStartClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.SlowStartClusterManager.cluster_start_timeout = start_timeout
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Submission fails due to start timeout
cluster_id = await gateway.submit()
with pytest.raises(GatewayClusterError) as exc:
async with gateway.connect(cluster_id):
pass
assert cluster_id in str(exc.value)
cluster = gateway_proc.db.cluster_from_name(cluster_id)
# Stop cluster called with last reported state
res = getattr(cluster.manager, state)
assert cluster.manager.stop_cluster_state == res
@pytest.mark.asyncio
async def test_slow_cluster_connect(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = SlowStartClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.SlowStartClusterManager.cluster_start_timeout = 0.1
config.SlowStartClusterManager.pause_time = 0
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Submission fails due to connect timeout
cluster_id = await gateway.submit()
with pytest.raises(GatewayClusterError) as exc:
async with gateway.connect(cluster_id):
pass
assert cluster_id in str(exc.value)
cluster = gateway_proc.db.cluster_from_name(cluster_id)
# Stop cluster called with last reported state
res = cluster.manager.state_3
assert cluster.manager.stop_cluster_state == res
@pytest.mark.asyncio
@pytest.mark.parametrize("fail_stage", [0, 1])
async def test_cluster_fails_during_start(tmpdir, fail_stage):
config = Config()
config.DaskGateway.cluster_manager_class = ClusterFailsDuringStart
config.DaskGateway.temp_dir = str(tmpdir)
config.ClusterFailsDuringStart.fail_stage = fail_stage
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Submission fails due to error during start
cluster_id = await gateway.submit()
with pytest.raises(GatewayClusterError) as exc:
async with gateway.connect(cluster_id):
pass
assert cluster_id in str(exc.value)
cluster_obj = gateway_proc.db.cluster_from_name(cluster_id)
# Stop cluster called with last reported state
res = {} if fail_stage == 0 else {"i": fail_stage - 1}
assert cluster_obj.manager.stop_cluster_state == res
@pytest.mark.asyncio
async def test_cluster_fails_between_start_and_connect(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = ClusterFailsBetweenStartAndConnect
config.DaskGateway.temp_dir = str(tmpdir)
config.ClusterFailsBetweenStartAndConnect.cluster_status_period = 0.1
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Submit cluster
cluster_id = await gateway.submit()
cluster_obj = gateway_proc.db.cluster_from_name(cluster_id)
# Connect and wait for start failure
with pytest.raises(GatewayClusterError) as exc:
await asyncio.wait_for(gateway.connect(cluster_id), 5)
assert cluster_id in str(exc.value)
assert "failed to start" in str(exc.value)
assert cluster_obj.manager.status == "stopped"
@pytest.mark.asyncio
async def test_cluster_fails_after_connect(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = ClusterFailsAfterConnect
config.DaskGateway.temp_dir = str(tmpdir)
config.ClusterFailsAfterConnect.cluster_status_period = 0.25
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Cluster starts successfully
cluster_id = await gateway.submit()
cluster_obj = gateway_proc.db.cluster_from_name(cluster_id)
async with gateway.connect(cluster_id):
# Wait for cluster to fail while running
await asyncio.wait_for(cluster_obj.manager.failed, 3)
# Stop cluster called to cleanup after failure
await asyncio.wait_for(cluster_obj.manager.stop_cluster_called, 3)
@pytest.mark.asyncio
@pytest.mark.parametrize("start_timeout,state", [(0.1, 0), (0.25, 1)])
async def test_slow_worker_start(tmpdir, start_timeout, state):
config = Config()
config.DaskGateway.cluster_manager_class = SlowWorkerStartClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.SlowWorkerStartClusterManager.worker_start_timeout = start_timeout
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster = await gateway.new_cluster()
await cluster.scale(1)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
# Wait for worker failure
timeout = 5
while timeout > 0:
if cluster_obj.manager.stop_worker_state is not None:
break
await asyncio.sleep(0.1)
timeout -= 0.1
else:
assert False, "Operation timed out"
# Stop worker called with last reported state
assert cluster_obj.manager.stop_worker_state == {"i": state}
# Stop the cluster
await cluster.shutdown()
@pytest.mark.asyncio
async def test_slow_worker_connect(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = SlowWorkerStartClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.SlowWorkerStartClusterManager.worker_start_timeout = 0.1
config.SlowWorkerStartClusterManager.pause_time = 0
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster = await gateway.new_cluster()
await cluster.scale(1)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
# Wait for worker failure
timeout = 5
while timeout > 0:
if cluster_obj.manager.stop_worker_state is not None:
break
await asyncio.sleep(0.1)
timeout -= 0.1
else:
assert False, "Operation timed out"
# Stop worker called with last reported state
assert cluster_obj.manager.stop_worker_state == {"i": 2}
# Stop the cluster
await cluster.shutdown()
@pytest.mark.asyncio
@pytest.mark.parametrize("fail_stage", [0, 1])
async def test_worker_fails_during_start(tmpdir, fail_stage):
config = Config()
config.DaskGateway.cluster_manager_class = WorkerFailsDuringStart
config.DaskGateway.temp_dir = str(tmpdir)
config.WorkerFailsDuringStart.fail_stage = fail_stage
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster = await gateway.new_cluster()
await cluster.scale(1)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
# Wait for worker failure
timeout = 5
while timeout > 0:
if cluster_obj.manager.stop_worker_state is not None:
break
await asyncio.sleep(0.1)
timeout -= 0.1
else:
assert False, "Operation timed out"
# Stop worker called with last reported state
res = {} if fail_stage == 0 else {"i": fail_stage - 1}
assert cluster_obj.manager.stop_worker_state == res
# Stop the cluster
await cluster.shutdown()
@pytest.mark.asyncio
async def test_worker_fails_between_start_and_connect(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = WorkerFailsBetweenStartAndConnect
config.DaskGateway.temp_dir = str(tmpdir)
config.WorkerFailsBetweenStartAndConnect.worker_status_period = 0.1
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster = await gateway.new_cluster()
await cluster.scale(1)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
# Wait for worker failure and stop_worker called
timeout = 5
while timeout > 0:
if cluster_obj.manager.status == "stopped":
break
await asyncio.sleep(0.1)
timeout -= 0.1
else:
assert False, "Operation timed out"
# Stop the cluster
await cluster.shutdown()
@pytest.mark.asyncio
async def test_worker_fails_after_connect(tmpdir):
async with temp_gateway(
cluster_manager_class=WorkerFailsAfterConnect, temp_dir=str(tmpdir)
) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster = await gateway.new_cluster()
await cluster.scale(1)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
# Wait for worker to connect
await asyncio.wait_for(cluster_obj.manager.worker_connected, 30)
# Close the worker
worker = list(cluster_obj.manager.workers.values())[0]
await worker.close(1)
# Stop cluster called to cleanup after failure
await asyncio.wait_for(cluster_obj.manager.stop_worker_called, 30)
await cluster.shutdown()
@pytest.mark.asyncio
async def test_successful_cluster(tmpdir):
async with temp_gateway(
cluster_manager_class=InProcessClusterManager, temp_dir=str(tmpdir)
) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# No currently running clusters
clusters = await gateway.list_clusters()
assert clusters == []
# Start a cluster
cluster = await gateway.new_cluster()
# Cluster is now present in list
clusters = await gateway.list_clusters()
assert len(clusters)
assert clusters[0].name == cluster.name
# Scale up, connect, and compute
await cluster.scale(2)
with cluster.get_client(set_as_default=False) as client:
res = await client.submit(lambda x: x + 1, 1)
assert res == 2
# Scale down
await cluster.scale(1)
# Can still compute
with cluster.get_client(set_as_default=False) as client:
res = await client.submit(lambda x: x + 1, 1)
assert res == 2
# Shutdown the cluster
await cluster.shutdown()
class ClusterOptionsManager(InProcessClusterManager):
option_two = Float(config=True)
option_one_b = Integer(config=True)
@pytest.mark.asyncio
async def test_cluster_manager_options(tmpdir):
async with temp_gateway(
cluster_manager_class=ClusterOptionsManager,
cluster_manager_options=options.Options(
options.Integer(
"option_one", default=1, min=1, max=4, target="option_one_b"
),
options.Select("option_two", options=[("small", 1.5), ("large", 15)]),
),
temp_dir=str(tmpdir),
) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Create with no parameters
cluster = await gateway.new_cluster()
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
assert cluster_obj.manager.option_one_b == 1
assert cluster_obj.manager.option_two == 1.5
assert cluster_obj.options == {"option_one": 1, "option_two": "small"}
await cluster.shutdown()
# Create with parameters
cluster = await gateway.new_cluster(option_two="large")
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
assert cluster_obj.manager.option_one_b == 1
assert cluster_obj.manager.option_two == 15
assert cluster_obj.options == {"option_one": 1, "option_two": "large"}
await cluster.shutdown()
# With options object
opts = await gateway.cluster_options()
opts.option_one = 2
cluster = await gateway.new_cluster(opts, option_two="large")
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
assert cluster_obj.manager.option_one_b == 2
assert cluster_obj.manager.option_two == 15
assert cluster_obj.options == {"option_one": 2, "option_two": "large"}
await cluster.shutdown()
# Bad parameters
with pytest.raises(TypeError):
await gateway.new_cluster(cluster_options=10)
with pytest.raises(ValueError) as exc:
await gateway.new_cluster(option_two="medium")
assert "option_two" in str(exc.value)
@pytest.mark.asyncio
async def test_cluster_manager_options_client_config(tmpdir, monkeypatch):
monkeypatch.setenv("TEST_OPTION_TWO", "large")
async with temp_gateway(
cluster_manager_class=ClusterOptionsManager,
cluster_manager_options=options.Options(
options.Integer(
"option_one", default=1, min=1, max=4, target="option_one_b"
),
options.Select("option_two", options=[("small", 1.5), ("large", 15)]),
),
temp_dir=str(tmpdir),
) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
with dask.config.set(gateway__cluster__options={"option_one": 2}):
# Local config can override
opts = await gateway.cluster_options()
assert opts.option_one == 2
assert opts.option_two == "small"
# Without local config, uses server-side defaults
opts = await gateway.cluster_options(use_local_defaults=False)
assert opts.option_one == 1
assert opts.option_two == "small"
with dask.config.set(
gateway__cluster__options={"option_two": "{TEST_OPTION_TWO}"}
):
# Values can format from environment variables
opts = await gateway.cluster_options()
assert opts.option_one == 1
assert opts.option_two == "large"
with dask.config.set(
gateway__cluster__options={
"option_two": "{TEST_OPTION_TWO}",
"option_one": 3,
}
):
# Defaults are merged with kwargs to new_cluster
cluster = await gateway.new_cluster(option_one=2)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
assert cluster_obj.options == {"option_one": 2, "option_two": "large"}
await cluster.shutdown()
# If passing `cluster_options`, defaults are assumed already applied
opts = await gateway.cluster_options()
opts.option_two = "small"
cluster = await gateway.new_cluster(opts)
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
assert cluster_obj.options == {"option_one": 3, "option_two": "small"}
await cluster.shutdown()
@pytest.mark.asyncio
async def test_gateway_stop_clusters_on_shutdown(tmpdir):
async with temp_gateway(
cluster_manager_class=InProcessClusterManager, temp_dir=str(tmpdir)
) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster = await gateway.new_cluster()
cluster2 = await gateway.new_cluster()
await cluster2.shutdown()
cluster_obj = gateway_proc.db.cluster_from_name(cluster.name)
cluster_obj2 = gateway_proc.db.cluster_from_name(cluster2.name)
# There is an active cluster
assert cluster_obj.manager.scheduler is not None
# Active clusters are stopped on shutdown
for c in [cluster_obj, cluster_obj2]:
assert c.manager.scheduler is None
assert c.status >= ClusterStatus.STOPPED
@pytest.mark.asyncio
async def test_gateway_resume_clusters_after_shutdown(tmpdir):
temp_dir = str(tmpdir)
db_url = "sqlite:///%s" % tmpdir.join("dask_gateway.sqlite")
db_encrypt_keys = [Fernet.generate_key()]
async with temp_gateway(
cluster_manager_class=LocalTestingClusterManager,
temp_dir=temp_dir,
db_url=db_url,
db_encrypt_keys=db_encrypt_keys,
stop_clusters_on_shutdown=False,
) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
cluster1_name = await gateway.submit()
async with gateway.connect(cluster1_name) as c:
await c.scale(2)
cluster2_name = await gateway.submit()
async with gateway.connect(cluster2_name):
pass
async with gateway.new_cluster():
pass
active_clusters = {c.name: c for c in gateway_proc.db.active_clusters()}
# Active clusters are not stopped on shutdown
assert active_clusters
# Stop 1 worker in cluster 1
worker = list(active_clusters[cluster1_name].workers.values())[0]
pid = worker.state["pid"]
os.kill(pid, signal.SIGTERM)
# Stop cluster 2
pid = active_clusters[cluster2_name].state["pid"]
os.kill(pid, signal.SIGTERM)
# Restart a new temp_gateway
async with temp_gateway(
cluster_manager_class=LocalTestingClusterManager,
temp_dir=temp_dir,
db_url=db_url,
db_encrypt_keys=db_encrypt_keys,
stop_clusters_on_shutdown=False,
gateway_url=gateway_proc.gateway_urls.connect_url,
private_url=gateway_proc.private_urls.connect_url,
public_url=gateway_proc.public_urls.connect_url,
check_cluster_timeout=2,
) as gateway_proc:
active_clusters = list(gateway_proc.db.active_clusters())
assert len(active_clusters) == 1
cluster = active_clusters[0]
assert cluster.name == cluster1_name
assert len(cluster.active_workers()) == 1
# Check that cluster is available and everything still works
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
async with gateway.connect(
cluster1_name, shutdown_on_close=True
) as cluster:
with cluster.get_client(set_as_default=False) as client:
res = await client.submit(lambda x: x + 1, 1)
assert res == 2
@pytest.mark.asyncio
async def test_user_limits(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = InProcessClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.UserLimits.max_clusters = 1
config.UserLimits.max_cores = 3
config.InProcessClusterManager.scheduler_cores = 1
config.InProcessClusterManager.worker_cores = 2
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Start a cluster
cluster = await gateway.new_cluster()
# Only one cluster allowed
with pytest.raises(ValueError) as exc:
await gateway.new_cluster()
assert "user limit" in str(exc.value)
# Scaling > 1 triggers a warning, only scales to 1
with pytest.warns(GatewayWarning, match="user cores limit"):
await cluster.scale(2)
# Shutdown the cluster
await cluster.shutdown()
# Can create a new cluster after resources returned
cluster = await gateway.new_cluster()
await cluster.shutdown()
async def wait_for_workers(cluster, atleast=None, exact=None, timeout=30):
timeout = time.time() + timeout
while time.time() < timeout:
workers = cluster.scheduler_info.get("workers")
nworkers = len(workers)
if atleast is not None and nworkers >= atleast:
break
elif exact is not None and nworkers == exact:
break
await asyncio.sleep(0.25)
else:
assert False, "scaling timed out"
@pytest.mark.asyncio
async def test_scaling(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = InProcessClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Start a cluster
cluster = await gateway.new_cluster()
await cluster.scale(5)
await wait_for_workers(cluster, atleast=3)
await cluster.scale(1)
await wait_for_workers(cluster, exact=1)
await cluster.shutdown()
@pytest.mark.asyncio
async def test_adaptive_scaling(tmpdir):
# XXX: we should be able to use `InProcessClusterManager` here, but due to
# https://github.com/dask/distributed/issues/3251 this results in periodic
# failures.
config = Config()
config.DaskGateway.cluster_manager_class = LocalTestingClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.LocalTestingClusterManager.adaptive_period = 0.25
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Start a cluster
cluster = await gateway.new_cluster()
async def is_adaptive():
report = await gateway.get_cluster(cluster.name)
return report.adaptive
# Not in adaptive mode
assert not await is_adaptive()
# Turn on adaptive scaling
await cluster.adapt()
# Now in adaptive mode
assert await is_adaptive()
# Worker is automatically requested
with cluster.get_client(set_as_default=False) as client:
res = await client.submit(lambda x: x + 1, 1)
assert res == 2
# Scales down automatically
await wait_for_workers(cluster, exact=0)
# Still in adaptive mode
assert await is_adaptive()
# Turn off adaptive scaling implicitly
await cluster.scale(1)
assert not await is_adaptive()
# Turn off adaptive scaling explicitly
await cluster.adapt()
assert await is_adaptive()
await cluster.adapt(active=False)
assert not await is_adaptive()
# Shutdown the cluster
await cluster.shutdown()
@pytest.mark.asyncio
async def test_idle_timeout(tmpdir):
config = Config()
config.DaskGateway.cluster_manager_class = InProcessClusterManager
config.DaskGateway.temp_dir = str(tmpdir)
config.InProcessClusterManager.idle_timeout = 2
async with temp_gateway(config=config) as gateway_proc:
async with Gateway(
address=gateway_proc.public_urls.connect_url,
proxy_address=gateway_proc.gateway_urls.connect_url,
asynchronous=True,
) as gateway:
# Start a cluster
cluster = await gateway.new_cluster()
# Add some workers
await cluster.scale(2)
await wait_for_workers(cluster, atleast=1)
waited = 0
while await gateway.list_clusters():
await asyncio.sleep(0.25)
waited += 0.25
if waited >= 5:
assert False, "Failed to automatically shutdown in time"
# Calling shutdown doesn't break anything
await cluster.shutdown()