def test_async(c, s, a, b):
x = create_test_data()
assert not dask.is_dask_collection(x)
y = x.chunk({'dim2': 4}) + 10
assert dask.is_dask_collection(y)
assert dask.is_dask_collection(y.var1)
assert dask.is_dask_collection(y.var2)
z = y.persist()
assert str(z)
assert dask.is_dask_collection(z)
assert dask.is_dask_collection(z.var1)
assert dask.is_dask_collection(z.var2)
assert len(y.__dask_graph__()) > len(z.__dask_graph__())
assert not futures_of(y)
assert futures_of(z)
future = c.compute(z)
w = yield future
assert not dask.is_dask_collection(w)
assert_allclose(x + 10, w)
assert s.tasks
def test_publish_bag(s, a, b):
db = pytest.importorskip('dask.bag')
c = yield Client((s.ip, s.port), asynchronous=True)
f = yield Client((s.ip, s.port), asynchronous=True)
bag = db.from_sequence([0, 1, 2])
bagp = c.persist(bag)
assert len(futures_of(bagp)) == 3
keys = {f.key for f in futures_of(bagp)}
assert keys == set(bag.dask)
yield c.publish_dataset(data=bagp)
# check that serialization didn't affect original bag's dask
assert len(futures_of(bagp)) == 3
result = yield f.get_dataset('data')
assert set(result.dask.keys()) == set(bagp.dask.keys())
assert {f.key for f in result.dask.values()} == {f.key for f in bagp.dask.values()}
out = yield f.compute(result)
assert out == [0, 1, 2]
yield c.close()
yield f.close()
def test_publish_bag(s, a, b):
db = pytest.importorskip('dask.bag')
c = yield Client((s.ip, s.port), asynchronous=True)
f = yield Client((s.ip, s.port), asynchronous=True)
bag = db.from_sequence([0, 1, 2])
bagp = c.persist(bag)
assert len(futures_of(bagp)) == 3
keys = {f.key for f in futures_of(bagp)}
assert keys == set(bag.dask)
yield c.publish_dataset(data=bagp)
# check that serialization didn't affect original bag's dask
assert len(futures_of(bagp)) == 3
result = yield f.get_dataset('data')
assert set(result.dask.keys()) == set(bagp.dask.keys())
assert {f.key for f in result.dask.values()} == {f.key for f in bagp.dask.values()}
out = yield f.compute(result)
assert out == [0, 1, 2]
yield c.close()
yield f.close()
async def test_publish_bag(s, a, b):
db = pytest.importorskip("dask.bag")
c = await Client(s.address, asynchronous=True)
f = await Client(s.address, asynchronous=True)
bag = db.from_sequence([0, 1, 2])
bagp = c.persist(bag)
assert len(futures_of(bagp)) == 3
keys = {f.key for f in futures_of(bagp)}
assert keys == set(bag.dask)
await c.publish_dataset(data=bagp)
# check that serialization didn't affect original bag's dask
assert len(futures_of(bagp)) == 3
result = await f.get_dataset("data")
assert set(result.dask.keys()) == set(bagp.dask.keys())
assert {f.key
for f in result.dask.values()
} == {f.key
for f in bagp.dask.values()}
out = await f.compute(result)
assert out == [0, 1, 2]
await c.close()
await f.close()
def test_async(c, s, a, b):
x = create_test_data()
assert not dask.is_dask_collection(x)
y = x.chunk({'dim2': 4}) + 10
assert dask.is_dask_collection(y)
assert dask.is_dask_collection(y.var1)
assert dask.is_dask_collection(y.var2)
z = y.persist()
assert str(z)
assert dask.is_dask_collection(z)
assert dask.is_dask_collection(z.var1)
assert dask.is_dask_collection(z.var2)
assert len(y.__dask_graph__()) > len(z.__dask_graph__())
assert not futures_of(y)
assert futures_of(z)
future = c.compute(z)
w = yield future
assert not dask.is_dask_collection(w)
assert_allclose(x + 10, w)
assert s.tasks
def tqdm_dask(futures, **kwargs):
notebook = is_kernel()
futures = futures_of(futures)
if not isinstance(futures, (set, list)):
futures = [futures]
if notebook:
return TqdmNotebookProgress(futures, **kwargs)
else:
TqdmProgressBar(futures, **kwargs)
async def _get_errored_future(self, future):
"""
For a given future collection, return the first future that raised
an error.
"""
await wait(future)
futures = [f.key for f in futures_of(future) if f.status == "error"]
if not futures:
raise ValueError("No errored futures passed")
cause_key = await self.scheduler.get_error_cause(keys=futures)
return cause_key
async def test_async(c, s, a, b):
"""Test asynchronous operations."""
da = dask.array.arange(0, 25, chunks=5, dtype=float).reshape((5, 5))
q = ureg.Quantity(da, units_)
x = q + ureg.Quantity(5, units_)
y = x.persist()
assert str(y)
assert dask.is_dask_collection(y)
assert len(x.__dask_graph__()) > len(y.__dask_graph__())
assert not futures_of(x)
assert futures_of(y)
future = c.compute(y)
w = await future
assert not dask.is_dask_collection(w)
truth = np.arange(0, 25, dtype=float).reshape((5, 5)) + 5
assert np.all(truth == w.m)
def release_collection(collection, client=None):
"""
An explicit unpersist() function for dask collections,
for when you can't merely release the reference because
it is held by a downstream persisted() task.
Copied from:
- https://github.com/dask/dask/issues/2492
- https://stackoverflow.com/questions/44797668
"""
if client is None or isinstance(client, DebugClient):
return
for future in futures_of(collection):
future.release()
def progress(*futures, notebook=None, multi=True, complete=True, **kwargs):
"""Track progress of futures
This operates differently in the notebook and the console
* Notebook: This returns immediately, leaving an IPython widget on screen
* Console: This blocks until the computation completes
Parameters
----------
futures : Futures
A list of futures or keys to track
notebook : bool (optional)
Running in the notebook or not (defaults to guess)
multi : bool (optional)
Track different functions independently (defaults to True)
complete : bool (optional)
Track all keys (True) or only keys that have not yet run (False)
(defaults to True)
Notes
-----
In the notebook, the output of `progress` must be the last statement
in the cell. Typically, this means calling `progress` at the end of a
cell.
Examples
--------
>>> progress(futures) # doctest: +SKIP
[########################################] | 100% Completed | 1.7s
"""
futures = futures_of(futures)
if not isinstance(futures, (set, list)):
futures = [futures]
if notebook is None:
notebook = is_kernel() # often but not always correct assumption
if notebook:
if multi:
bar = MultiProgressWidget(futures, complete=complete, **kwargs)
else:
bar = ProgressWidget(futures, complete=complete, **kwargs)
return bar
else:
TextProgressBar(futures, complete=complete, **kwargs)
def progress(*futures):
"""Track progress of dask computation in a remote cluster.
LogProgressBar is defined inside here to avoid having to import
its dependencies if not used.
"""
# Import distributed only when used
from distributed.client import futures_of # pylint: disable=C0415
from distributed.diagnostics.progressbar import TextProgressBar # pylint: disable=c0415
class LogProgressBar(TextProgressBar):
"""Dask progress bar based on logging instead of stdout."""
last = 0
logger = logging.getLogger('distributed')
def _draw_bar(self, remaining, all, **kwargs): # pylint: disable=W0221,W0622
done = all - remaining
frac = (done / all) if all else 0
if frac > self.last + 0.01:
self.last = int(frac * 100) / 100
bar = "#" * int(self.width * frac)
percent = int(100 * frac)
time_per_task = self.elapsed / (all - remaining)
remaining_time = timedelta(seconds=time_per_task * remaining)
eta = datetime.utcnow() + remaining_time
elapsed = timedelta(seconds=self.elapsed)
msg = "[{0:<{1}}] | {2}/{3} ({4}%) Completed | {5} | {6} | {7}".format(
bar, self.width, done, all, percent, elapsed, remaining_time, eta
)
self.logger.info(msg)
LOGGER.info(msg)
def _draw_stop(self, **kwargs):
pass
futures = futures_of(futures)
if not isinstance(futures, (set, list)):
futures = [futures]
LogProgressBar(futures)
def _compute(collection, recreate_error_locally=True, **kwargs):
"""This function works exactly as dask.compute, but automatically
recreates the error locally so that it can be inspected with pdb.
"""
try:
client = distributed.Client.current()
except ValueError as e:
if "No clients found" not in str(e):
raise e
client = None
if client:
collection = collection.persist()
futures = futures_of(collection)
distributed.wait(futures)
gathered = gather(futures, recreate_error_locally)
f, a = collection.__dask_postcompute__()
res = f(gathered, *a)
return res
else:
return collection.compute(
recreate_error_locally=recreate_error_locally)
def progress(*futures):
futures = futures_of(futures)
if not isinstance(futures, (set, list)):
futures = [futures]
LogProgressBar(futures)
some_bag.npartitions # In[ ]: distributed_array.chunks # In[ ]: import dask.dataframe as dd df = dd.from_dask_array(distributed_array) # In[ ]: df.index # In[ ]: #tag::manual_persist[] df.persist # You do a bunch of things on DF # I'm done! from distributed.client import futures_of list(map(lambda x: x.release(), futures_of(df))) #end::manual_persist[] # In[ ]: # In[ ]:
