def test_lingering_client():
@gen_cluster()
async def f(s, a, b):
await Client(s.address, asynchronous=True)
f()
with pytest.raises(ValueError):
default_client()
def test_lingering_client():
@gen_cluster()
def f(s, a, b):
c = yield Client(s.address, asynchronous=True)
f()
with pytest.raises(ValueError):
default_client()
def __init__(self, client=None):
self.client = client if client is not None else default_client()
self.sessionId = uuid.uuid4().bytes
# Get address of all workers (not Nanny addresses)
self.worker_addresses = list(self.client.run(lambda: 42).keys())
# Make all workers listen and get all listen addresses
self.worker_direct_addresses = []
for rank, address in enumerate(self.worker_addresses):
self.worker_direct_addresses.append(
self.submit(
address,
_create_listeners,
len(self.worker_addresses),
rank,
wait=True,
))
# Each worker creates an endpoint to all workers with greater rank
self.run(_create_endpoints, self.worker_direct_addresses)
# At this point all workers should have a rank and endpoints to
# all other workers thus we can now stop the listening.
self.run(_stop_ucp_listeners)
def extract_ddf_partitions(ddf, client=None, agg=True):
"""
Given a Dask dataframe, return an OrderedDict mapping
'worker -> [list of futures]' for each partition in ddf.
:param ddf: Dask.dataframe split dataframe partitions into a list of
futures.
:param client: dask.distributed.Client Optional client to use
"""
client = default_client() if client is None else client
delayed_ddf = ddf.to_delayed()
parts = client.compute(delayed_ddf)
yield wait(parts)
key_to_part_dict = dict([(str(part.key), part) for part in parts])
who_has = yield client.who_has(parts)
worker_map = {} # Map from part -> worker
for key, workers in who_has.items():
worker = first(workers)
worker_map[key_to_part_dict[key]] = worker
worker_to_parts = []
for part in parts:
worker = worker_map[part]
worker_to_parts.append((worker, part))
yield wait(worker_to_parts)
raise gen.Return(worker_to_parts)
def __init__(self, fs):
"""
Parameters
----------
fs: FileSystem instance
"""
import distributed
super().__init__(fs)
client = distributed.default_client()
self.files = client.submit(FileActor, actor=True).result()
def dataframes_to_dask_dataframe(futures, client=None):
"""
Convert a list of futures containing Dataframes (pandas or cudf) into a Dask.Dataframe
:param futures: list of futures containing dataframes
:param client: dask.distributed.Client Optional client to use
:return: dask.Dataframe a dask.Dataframe
"""
c = default_client() if client is None else client
# Convert a list of futures containing dfs back into a dask_cudf
dfs = [d for d in futures if d.type != type(None)] # NOQA
meta = c.submit(get_meta, dfs[0]).result()
return dd.from_delayed(dfs, meta=meta)
def test_get_client(c, s, a, b):
def f(x):
cc = get_client()
future = cc.submit(inc, x)
return future.result()
assert default_client() is c
future = c.submit(f, 10, workers=a.address)
result = yield future
assert result == 11
assert a._client
assert not b._client
assert a._client is c
assert default_client() is c
a_client = a._client
for i in range(10):
yield wait(c.submit(f, i))
assert a._client is a_client
def test_get_client(c, s, a, b):
def f(x):
cc = get_client()
future = cc.submit(inc, x)
return future.result()
assert default_client() is c
future = c.submit(f, 10, workers=a.address)
result = yield future
assert result == 11
assert a._client
assert not b._client
assert a._client is c
assert default_client() is c
a_client = a._client
for i in range(10):
yield wait(c.submit(f, i))
assert a._client is a_client
