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holoviz / datashader

Quickly and accurately render even the largest data.
http://datashader.org
BSD 3-Clause "New" or "Revised" License
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Empty output (sometimes) for dask=2022.12.1 #1206

Closed jbednar closed 1 year ago

jbednar commented 1 year ago

For this code:

import datashader as ds, dask, dask.dataframe as dd

df = dd.read_parquet('./data/census2010.parq', engine='fastparquet')
df = df.persist()

cvs = ds.Canvas(plot_width=900, plot_height=525)
agg = cvs.points(df, 'easting', 'northing')

ds.tf.shade(agg, how='eq_hist')

import holoviews as hv
from holoviews.operation.datashader import datashade, dynspread
hv.extension('bokeh')

points = hv.Points(hv.Dataset(df, kdims=['easting', 'northing']))
datashade(points).opts(width=930, height=525)

the usual output is:

image

With dask=2022.11.1 or earlier, the HoloViews plot can be zoomed at will, and rerenders reliably. However, with dask=2022.12.1 (or later, up to the current version 2023.4.0), sometimes there is no output rendered for ds.tf.shade(agg, how='eq_hist'), and zooming in and out of the HoloViews plot soon gives various errors that suggest an empty output as well:

  File "/Users/jbednar/examples/census/envs/default/lib/python3.10/asyncio/events.py", line 80, in _run
    self._context.run(self._callback, *self._args)
  File "/Users/jbednar/examples/census/envs/default/lib/python3.10/site-packages/tornado/platform/asyncio.py", line 192, in _handle_events
    handler_func(fileobj, events)
  File "/Users/jbednar/examples/census/envs/default/lib/python3.10/site-packages/tornado/iostream.py", line 695, in _handle_events
    self._handle_write()
  File "/Users/jbednar/examples/census/envs/default/lib/python3.10/site-packages/tornado/iostream.py", line 965, in _handle_write
    self._write_buffer.advance(num_bytes)
  File "/Users/jbednar/examples/census/envs/default/lib/python3.10/site-packages/tornado/iostream.py", line 182, in advance
    assert 0 < size <= self._size
AssertionError

After those errors start, the plot no longer re-renders.

jbednar commented 1 year ago

I created the dask=2022.11.1 (working) environment censusold with the command:

conda create -y -n censusold -c conda-forge python=3.9 notebook dask=2022.11.1 datashader fastparquet python-snappy 'pandas<2' holoviews
# packages in environment at /Users/jbednar/miniconda3/envs/censusold:
#
# Name                    Version                   Build  Channel
anyio                     3.6.2              pyhd8ed1ab_0    conda-forge
appnope                   0.1.3              pyhd8ed1ab_0    conda-forge
argon2-cffi               21.3.0             pyhd8ed1ab_0    conda-forge
argon2-cffi-bindings      21.2.0           py39ha30fb19_3    conda-forge
asttokens                 2.2.1              pyhd8ed1ab_0    conda-forge
attrs                     22.2.0             pyh71513ae_0    conda-forge
backcall                  0.2.0              pyh9f0ad1d_0    conda-forge
backports                 1.0                pyhd8ed1ab_3    conda-forge
backports.functools_lru_cache 1.6.4              pyhd8ed1ab_0    conda-forge
beautifulsoup4            4.12.2             pyha770c72_0    conda-forge
bleach                    6.0.0              pyhd8ed1ab_0    conda-forge
bokeh                     2.4.3              pyhd8ed1ab_3    conda-forge
brotli                    1.0.9                hb7f2c08_8    conda-forge
brotli-bin                1.0.9                hb7f2c08_8    conda-forge
brotlipy                  0.7.0           py39ha30fb19_1005    conda-forge
bzip2                     1.0.8                h0d85af4_4    conda-forge
ca-certificates           2022.12.7            h033912b_0    conda-forge
certifi                   2022.12.7          pyhd8ed1ab_0    conda-forge
cffi                      1.15.1           py39h131948b_3    conda-forge
charset-normalizer        3.1.0              pyhd8ed1ab_0    conda-forge
click                     8.1.3           unix_pyhd8ed1ab_2    conda-forge
cloudpickle               2.2.1              pyhd8ed1ab_0    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
colorcet                  3.0.1              pyhd8ed1ab_0    conda-forge
comm                      0.1.3              pyhd8ed1ab_0    conda-forge
contourpy                 1.0.7            py39h92daf61_0    conda-forge
cramjam                   2.6.2            py39hd4bc93a_0    conda-forge
cryptography              40.0.2           py39hbeae22c_0    conda-forge
cycler                    0.11.0             pyhd8ed1ab_0    conda-forge
cytoolz                   0.12.0           py39ha30fb19_1    conda-forge
dask                      2022.11.1          pyhd8ed1ab_0    conda-forge
dask-core                 2022.11.1          pyhd8ed1ab_0    conda-forge
datashader                0.14.4             pyh1a96a4e_0    conda-forge
datashape                 0.5.4                      py_1    conda-forge
debugpy                   1.6.7            py39h7a8716b_0    conda-forge
decorator                 5.1.1              pyhd8ed1ab_0    conda-forge
defusedxml                0.7.1              pyhd8ed1ab_0    conda-forge
distributed               2022.11.1          pyhd8ed1ab_0    conda-forge
entrypoints               0.4                pyhd8ed1ab_0    conda-forge
executing                 1.2.0              pyhd8ed1ab_0    conda-forge
fastparquet               2023.2.0         py39h7cc1f47_0    conda-forge
flit-core                 3.8.0              pyhd8ed1ab_0    conda-forge
fonttools                 4.39.3           py39ha30fb19_0    conda-forge
freetype                  2.12.1               h3f81eb7_1    conda-forge
fsspec                    2023.4.0           pyh1a96a4e_0    conda-forge
holoviews                 1.15.4             pyhd8ed1ab_0    conda-forge
idna                      3.4                pyhd8ed1ab_0    conda-forge
importlib-metadata        6.6.0              pyha770c72_0    conda-forge
importlib-resources       5.12.0             pyhd8ed1ab_0    conda-forge
importlib_resources       5.12.0             pyhd8ed1ab_0    conda-forge
ipykernel                 6.22.0             pyh736e0ef_0    conda-forge
ipython                   8.12.0             pyhd1c38e8_0    conda-forge
ipython_genutils          0.2.0                      py_1    conda-forge
jedi                      0.18.2             pyhd8ed1ab_0    conda-forge
jinja2                    3.1.2              pyhd8ed1ab_1    conda-forge
jsonschema                4.17.3             pyhd8ed1ab_0    conda-forge
jupyter_client            7.3.4              pyhd8ed1ab_0    conda-forge
jupyter_core              5.3.0            py39h6e9494a_0    conda-forge
jupyter_server            1.23.6             pyhd8ed1ab_0    conda-forge
jupyterlab_pygments       0.2.2              pyhd8ed1ab_0    conda-forge
kiwisolver                1.4.4            py39h92daf61_1    conda-forge
lcms2                     2.15                 h2dcdeff_1    conda-forge
lerc                      4.0.0                hb486fe8_0    conda-forge
libblas                   3.9.0           16_osx64_openblas    conda-forge
libbrotlicommon           1.0.9                hb7f2c08_8    conda-forge
libbrotlidec              1.0.9                hb7f2c08_8    conda-forge
libbrotlienc              1.0.9                hb7f2c08_8    conda-forge
libcblas                  3.9.0           16_osx64_openblas    conda-forge
libcxx                    16.0.2               hd57cbcb_0    conda-forge
libdeflate                1.18                 hac1461d_0    conda-forge
libffi                    3.4.2                h0d85af4_5    conda-forge
libgfortran               5.0.0           11_3_0_h97931a8_31    conda-forge
libgfortran5              12.2.0              he409387_31    conda-forge
libjpeg-turbo             2.1.5.1              hb7f2c08_0    conda-forge
liblapack                 3.9.0           16_osx64_openblas    conda-forge
libllvm11                 11.1.0               h8fb7429_5    conda-forge
libopenblas               0.3.21          openmp_h429af6e_3    conda-forge
libpng                    1.6.39               ha978bb4_0    conda-forge
libsodium                 1.0.18               hbcb3906_1    conda-forge
libsqlite                 3.40.0               ha978bb4_1    conda-forge
libtiff                   4.5.0                hedf67fa_6    conda-forge
libwebp-base              1.3.0                hb7f2c08_0    conda-forge
libxcb                    1.13              h0d85af4_1004    conda-forge
libzlib                   1.2.13               hfd90126_4    conda-forge
llvm-openmp               16.0.2               hff08bdf_0    conda-forge
llvmlite                  0.39.1           py39had167e2_1    conda-forge
locket                    1.0.0              pyhd8ed1ab_0    conda-forge
lz4                       4.3.2            py39hd0af75a_0    conda-forge
lz4-c                     1.9.4                hf0c8a7f_0    conda-forge
markdown                  3.4.3              pyhd8ed1ab_0    conda-forge
markupsafe                2.1.2            py39ha30fb19_0    conda-forge
matplotlib-base           3.7.1            py39hb2f573b_0    conda-forge
matplotlib-inline         0.1.6              pyhd8ed1ab_0    conda-forge
mistune                   2.0.5              pyhd8ed1ab_0    conda-forge
msgpack-python            1.0.5            py39h92daf61_0    conda-forge
multipledispatch          0.6.0                      py_0    conda-forge
munkres                   1.1.4              pyh9f0ad1d_0    conda-forge
nbclassic                 0.5.6              pyh8b2e9e2_0    conda-forge
nbclient                  0.7.4              pyhd8ed1ab_0    conda-forge
nbconvert-core            7.3.1              pyhd8ed1ab_0    conda-forge
nbformat                  5.8.0              pyhd8ed1ab_0    conda-forge
ncurses                   6.3                  h96cf925_1    conda-forge
nest-asyncio              1.5.6              pyhd8ed1ab_0    conda-forge
notebook                  6.5.4              pyha770c72_0    conda-forge
notebook-shim             0.2.3              pyhd8ed1ab_0    conda-forge
numba                     0.56.4           py39h6e2ba77_1    conda-forge
numpy                     1.23.5           py39hdfa1d0c_0    conda-forge
openjpeg                  2.5.0                h13ac156_2    conda-forge
openssl                   3.1.0                h8a1eda9_2    conda-forge
packaging                 23.1               pyhd8ed1ab_0    conda-forge
pandas                    1.5.3            py39hecff1ad_1    conda-forge
pandocfilters             1.5.0              pyhd8ed1ab_0    conda-forge
panel                     0.14.4             pyhd8ed1ab_0    conda-forge
param                     1.13.0             pyh1a96a4e_0    conda-forge
parso                     0.8.3              pyhd8ed1ab_0    conda-forge
partd                     1.4.0              pyhd8ed1ab_0    conda-forge
pexpect                   4.8.0              pyh1a96a4e_2    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pillow                    9.5.0            py39h77c96bc_0    conda-forge
pip                       23.1.2             pyhd8ed1ab_0    conda-forge
pkgutil-resolve-name      1.3.10             pyhd8ed1ab_0    conda-forge
platformdirs              3.5.0              pyhd8ed1ab_0    conda-forge
pooch                     1.7.0              pyha770c72_3    conda-forge
prometheus_client         0.16.0             pyhd8ed1ab_0    conda-forge
prompt-toolkit            3.0.38             pyha770c72_0    conda-forge
prompt_toolkit            3.0.38               hd8ed1ab_0    conda-forge
psutil                    5.9.5            py39ha30fb19_0    conda-forge
pthread-stubs             0.4               hc929b4f_1001    conda-forge
ptyprocess                0.7.0              pyhd3deb0d_0    conda-forge
pure_eval                 0.2.2              pyhd8ed1ab_0    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pyct                      0.4.6                      py_0    conda-forge
pyct-core                 0.4.6                      py_0    conda-forge
pygments                  2.15.1             pyhd8ed1ab_0    conda-forge
pyobjc-core               9.1.1            py39h0504f80_0    conda-forge
pyobjc-framework-cocoa    9.1.1            py39h0504f80_0    conda-forge
pyopenssl                 23.1.1             pyhd8ed1ab_0    conda-forge
pyparsing                 3.0.9              pyhd8ed1ab_0    conda-forge
pyrsistent                0.19.3           py39ha30fb19_0    conda-forge
pysocks                   1.7.1              pyha2e5f31_6    conda-forge
python                    3.9.16          h709bd14_0_cpython    conda-forge
python-dateutil           2.8.2              pyhd8ed1ab_0    conda-forge
python-fastjsonschema     2.16.3             pyhd8ed1ab_0    conda-forge
python-snappy             0.6.1            py39hf74c2c1_0    conda-forge
python_abi                3.9                      3_cp39    conda-forge
pytz                      2023.3             pyhd8ed1ab_0    conda-forge
pyviz_comms               2.2.1              pyhd8ed1ab_1    conda-forge
pyyaml                    6.0              py39ha30fb19_5    conda-forge
pyzmq                     25.0.2           py39hed8f129_0    conda-forge
readline                  8.2                  h9e318b2_1    conda-forge
requests                  2.29.0             pyhd8ed1ab_0    conda-forge
scipy                     1.10.1           py39h4c5e66d_0    conda-forge
send2trash                1.8.2              pyhd1c38e8_0    conda-forge
setuptools                67.7.2             pyhd8ed1ab_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
snappy                    1.1.10               h225ccf5_0    conda-forge
sniffio                   1.3.0              pyhd8ed1ab_0    conda-forge
sortedcontainers          2.4.0              pyhd8ed1ab_0    conda-forge
soupsieve                 2.3.2.post1        pyhd8ed1ab_0    conda-forge
stack_data                0.6.2              pyhd8ed1ab_0    conda-forge
tblib                     1.7.0              pyhd8ed1ab_0    conda-forge
terminado                 0.17.1             pyhd1c38e8_0    conda-forge
tinycss2                  1.2.1              pyhd8ed1ab_0    conda-forge
tk                        8.6.12               h5dbffcc_0    conda-forge
toolz                     0.12.0             pyhd8ed1ab_0    conda-forge
tornado                   6.1              py39h63b48b0_3    conda-forge
tqdm                      4.65.0             pyhd8ed1ab_1    conda-forge
traitlets                 5.9.0              pyhd8ed1ab_0    conda-forge
typing-extensions         4.5.0                hd8ed1ab_0    conda-forge
typing_extensions         4.5.0              pyha770c72_0    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
unicodedata2              15.0.0           py39ha30fb19_0    conda-forge
urllib3                   1.26.15            pyhd8ed1ab_0    conda-forge
wcwidth                   0.2.6              pyhd8ed1ab_0    conda-forge
webencodings              0.5.1                      py_1    conda-forge
websocket-client          1.5.1              pyhd8ed1ab_0    conda-forge
wheel                     0.40.0             pyhd8ed1ab_0    conda-forge
xarray                    2023.4.2           pyhd8ed1ab_0    conda-forge
xorg-libxau               1.0.9                h35c211d_0    conda-forge
xorg-libxdmcp             1.1.3                h35c211d_0    conda-forge
xz                        5.2.6                h775f41a_0    conda-forge
yaml                      0.2.5                h0d85af4_2    conda-forge
zeromq                    4.3.4                he49afe7_1    conda-forge
zict                      3.0.0              pyhd8ed1ab_0    conda-forge
zipp                      3.15.0             pyhd8ed1ab_0    conda-forge
zstd                      1.5.2                hbc0c0cd_6    conda-forge
jbednar commented 1 year ago

I created the dask=2022.12.1 (not working) environment censusnew with the command:

conda create -y -n censusnew -c conda-forge python=3.9 notebook dask=2022.12.1 datashader fastparquet python-snappy 'pandas<2' holoviews
# packages in environment at /Users/jbednar/miniconda3/envs/censusnew:
#
# Name                    Version                   Build  Channel
anyio                     3.6.2              pyhd8ed1ab_0    conda-forge
appnope                   0.1.3              pyhd8ed1ab_0    conda-forge
argon2-cffi               21.3.0             pyhd8ed1ab_0    conda-forge
argon2-cffi-bindings      21.2.0           py39ha30fb19_3    conda-forge
asttokens                 2.2.1              pyhd8ed1ab_0    conda-forge
attrs                     22.2.0             pyh71513ae_0    conda-forge
backcall                  0.2.0              pyh9f0ad1d_0    conda-forge
backports                 1.0                pyhd8ed1ab_3    conda-forge
backports.functools_lru_cache 1.6.4              pyhd8ed1ab_0    conda-forge
beautifulsoup4            4.12.2             pyha770c72_0    conda-forge
bleach                    6.0.0              pyhd8ed1ab_0    conda-forge
bokeh                     2.4.3              pyhd8ed1ab_3    conda-forge
brotli                    1.0.9                hb7f2c08_8    conda-forge
brotli-bin                1.0.9                hb7f2c08_8    conda-forge
brotlipy                  0.7.0           py39ha30fb19_1005    conda-forge
bzip2                     1.0.8                h0d85af4_4    conda-forge
ca-certificates           2022.12.7            h033912b_0    conda-forge
certifi                   2022.12.7          pyhd8ed1ab_0    conda-forge
cffi                      1.15.1           py39h131948b_3    conda-forge
charset-normalizer        3.1.0              pyhd8ed1ab_0    conda-forge
click                     8.1.3           unix_pyhd8ed1ab_2    conda-forge
cloudpickle               2.2.1              pyhd8ed1ab_0    conda-forge
colorama                  0.4.6              pyhd8ed1ab_0    conda-forge
colorcet                  3.0.1              pyhd8ed1ab_0    conda-forge
comm                      0.1.3              pyhd8ed1ab_0    conda-forge
contourpy                 1.0.7            py39h92daf61_0    conda-forge
cramjam                   2.6.2            py39hd4bc93a_0    conda-forge
cryptography              40.0.2           py39hbeae22c_0    conda-forge
cycler                    0.11.0             pyhd8ed1ab_0    conda-forge
cytoolz                   0.12.0           py39ha30fb19_1    conda-forge
dask                      2022.12.1          pyhd8ed1ab_0    conda-forge
dask-core                 2022.12.1          pyhd8ed1ab_0    conda-forge
datashader                0.14.4             pyh1a96a4e_0    conda-forge
datashape                 0.5.4                      py_1    conda-forge
debugpy                   1.6.7            py39h7a8716b_0    conda-forge
decorator                 5.1.1              pyhd8ed1ab_0    conda-forge
defusedxml                0.7.1              pyhd8ed1ab_0    conda-forge
distributed               2022.12.1          pyhd8ed1ab_0    conda-forge
entrypoints               0.4                pyhd8ed1ab_0    conda-forge
executing                 1.2.0              pyhd8ed1ab_0    conda-forge
fastparquet               2023.2.0         py39h7cc1f47_0    conda-forge
flit-core                 3.8.0              pyhd8ed1ab_0    conda-forge
fonttools                 4.39.3           py39ha30fb19_0    conda-forge
freetype                  2.12.1               h3f81eb7_1    conda-forge
fsspec                    2023.4.0           pyh1a96a4e_0    conda-forge
holoviews                 1.15.4             pyhd8ed1ab_0    conda-forge
idna                      3.4                pyhd8ed1ab_0    conda-forge
importlib-metadata        6.6.0              pyha770c72_0    conda-forge
importlib-resources       5.12.0             pyhd8ed1ab_0    conda-forge
importlib_metadata        6.6.0                hd8ed1ab_0    conda-forge
importlib_resources       5.12.0             pyhd8ed1ab_0    conda-forge
ipykernel                 6.22.0             pyh736e0ef_0    conda-forge
ipython                   8.12.0             pyhd1c38e8_0    conda-forge
ipython_genutils          0.2.0                      py_1    conda-forge
jedi                      0.18.2             pyhd8ed1ab_0    conda-forge
jinja2                    3.1.2              pyhd8ed1ab_1    conda-forge
jsonschema                4.17.3             pyhd8ed1ab_0    conda-forge
jupyter_client            8.2.0              pyhd8ed1ab_0    conda-forge
jupyter_core              5.3.0            py39h6e9494a_0    conda-forge
jupyter_events            0.6.3              pyhd8ed1ab_0    conda-forge
jupyter_server            2.5.0              pyhd8ed1ab_0    conda-forge
jupyter_server_terminals  0.4.4              pyhd8ed1ab_1    conda-forge
jupyterlab_pygments       0.2.2              pyhd8ed1ab_0    conda-forge
kiwisolver                1.4.4            py39h92daf61_1    conda-forge
lcms2                     2.15                 h2dcdeff_1    conda-forge
lerc                      4.0.0                hb486fe8_0    conda-forge
libblas                   3.9.0           16_osx64_openblas    conda-forge
libbrotlicommon           1.0.9                hb7f2c08_8    conda-forge
libbrotlidec              1.0.9                hb7f2c08_8    conda-forge
libbrotlienc              1.0.9                hb7f2c08_8    conda-forge
libcblas                  3.9.0           16_osx64_openblas    conda-forge
libcxx                    16.0.2               hd57cbcb_0    conda-forge
libdeflate                1.18                 hac1461d_0    conda-forge
libffi                    3.4.2                h0d85af4_5    conda-forge
libgfortran               5.0.0           11_3_0_h97931a8_31    conda-forge
libgfortran5              12.2.0              he409387_31    conda-forge
libjpeg-turbo             2.1.5.1              hb7f2c08_0    conda-forge
liblapack                 3.9.0           16_osx64_openblas    conda-forge
libllvm11                 11.1.0               h8fb7429_5    conda-forge
libopenblas               0.3.21          openmp_h429af6e_3    conda-forge
libpng                    1.6.39               ha978bb4_0    conda-forge
libsodium                 1.0.18               hbcb3906_1    conda-forge
libsqlite                 3.40.0               ha978bb4_1    conda-forge
libtiff                   4.5.0                hedf67fa_6    conda-forge
libwebp-base              1.3.0                hb7f2c08_0    conda-forge
libxcb                    1.13              h0d85af4_1004    conda-forge
libzlib                   1.2.13               hfd90126_4    conda-forge
llvm-openmp               16.0.2               hff08bdf_0    conda-forge
llvmlite                  0.39.1           py39had167e2_1    conda-forge
locket                    1.0.0              pyhd8ed1ab_0    conda-forge
lz4                       4.3.2            py39hd0af75a_0    conda-forge
lz4-c                     1.9.4                hf0c8a7f_0    conda-forge
markdown                  3.4.3              pyhd8ed1ab_0    conda-forge
markupsafe                2.1.2            py39ha30fb19_0    conda-forge
matplotlib-base           3.7.1            py39hb2f573b_0    conda-forge
matplotlib-inline         0.1.6              pyhd8ed1ab_0    conda-forge
mistune                   2.0.5              pyhd8ed1ab_0    conda-forge
msgpack-python            1.0.5            py39h92daf61_0    conda-forge
multipledispatch          0.6.0                      py_0    conda-forge
munkres                   1.1.4              pyh9f0ad1d_0    conda-forge
nbclassic                 0.5.6              pyh8b2e9e2_0    conda-forge
nbclient                  0.7.4              pyhd8ed1ab_0    conda-forge
nbconvert-core            7.3.1              pyhd8ed1ab_0    conda-forge
nbformat                  5.8.0              pyhd8ed1ab_0    conda-forge
ncurses                   6.3                  h96cf925_1    conda-forge
nest-asyncio              1.5.6              pyhd8ed1ab_0    conda-forge
notebook                  6.5.4              pyha770c72_0    conda-forge
notebook-shim             0.2.3              pyhd8ed1ab_0    conda-forge
numba                     0.56.4           py39h6e2ba77_1    conda-forge
numpy                     1.23.5           py39hdfa1d0c_0    conda-forge
openjpeg                  2.5.0                h13ac156_2    conda-forge
openssl                   3.1.0                h8a1eda9_2    conda-forge
packaging                 23.1               pyhd8ed1ab_0    conda-forge
pandas                    1.5.3            py39hecff1ad_1    conda-forge
pandocfilters             1.5.0              pyhd8ed1ab_0    conda-forge
panel                     0.14.4             pyhd8ed1ab_0    conda-forge
param                     1.13.0             pyh1a96a4e_0    conda-forge
parso                     0.8.3              pyhd8ed1ab_0    conda-forge
partd                     1.4.0              pyhd8ed1ab_0    conda-forge
pexpect                   4.8.0              pyh1a96a4e_2    conda-forge
pickleshare               0.7.5                   py_1003    conda-forge
pillow                    9.5.0            py39h77c96bc_0    conda-forge
pip                       23.1.2             pyhd8ed1ab_0    conda-forge
pkgutil-resolve-name      1.3.10             pyhd8ed1ab_0    conda-forge
platformdirs              3.5.0              pyhd8ed1ab_0    conda-forge
pooch                     1.7.0              pyha770c72_3    conda-forge
prometheus_client         0.16.0             pyhd8ed1ab_0    conda-forge
prompt-toolkit            3.0.38             pyha770c72_0    conda-forge
prompt_toolkit            3.0.38               hd8ed1ab_0    conda-forge
psutil                    5.9.5            py39ha30fb19_0    conda-forge
pthread-stubs             0.4               hc929b4f_1001    conda-forge
ptyprocess                0.7.0              pyhd3deb0d_0    conda-forge
pure_eval                 0.2.2              pyhd8ed1ab_0    conda-forge
pycparser                 2.21               pyhd8ed1ab_0    conda-forge
pyct                      0.4.6                      py_0    conda-forge
pyct-core                 0.4.6                      py_0    conda-forge
pygments                  2.15.1             pyhd8ed1ab_0    conda-forge
pyobjc-core               9.1.1            py39h0504f80_0    conda-forge
pyobjc-framework-cocoa    9.1.1            py39h0504f80_0    conda-forge
pyopenssl                 23.1.1             pyhd8ed1ab_0    conda-forge
pyparsing                 3.0.9              pyhd8ed1ab_0    conda-forge
pyrsistent                0.19.3           py39ha30fb19_0    conda-forge
pysocks                   1.7.1              pyha2e5f31_6    conda-forge
python                    3.9.16          h709bd14_0_cpython    conda-forge
python-dateutil           2.8.2              pyhd8ed1ab_0    conda-forge
python-fastjsonschema     2.16.3             pyhd8ed1ab_0    conda-forge
python-json-logger        2.0.7              pyhd8ed1ab_0    conda-forge
python-snappy             0.6.1            py39hf74c2c1_0    conda-forge
python_abi                3.9                      3_cp39    conda-forge
pytz                      2023.3             pyhd8ed1ab_0    conda-forge
pyviz_comms               2.2.1              pyhd8ed1ab_1    conda-forge
pyyaml                    6.0              py39ha30fb19_5    conda-forge
pyzmq                     25.0.2           py39hed8f129_0    conda-forge
readline                  8.2                  h9e318b2_1    conda-forge
requests                  2.29.0             pyhd8ed1ab_0    conda-forge
rfc3339-validator         0.1.4              pyhd8ed1ab_0    conda-forge
rfc3986-validator         0.1.1              pyh9f0ad1d_0    conda-forge
scipy                     1.10.1           py39h4c5e66d_0    conda-forge
send2trash                1.8.2              pyhd1c38e8_0    conda-forge
setuptools                67.7.2             pyhd8ed1ab_0    conda-forge
six                       1.16.0             pyh6c4a22f_0    conda-forge
snappy                    1.1.10               h225ccf5_0    conda-forge
sniffio                   1.3.0              pyhd8ed1ab_0    conda-forge
sortedcontainers          2.4.0              pyhd8ed1ab_0    conda-forge
soupsieve                 2.3.2.post1        pyhd8ed1ab_0    conda-forge
stack_data                0.6.2              pyhd8ed1ab_0    conda-forge
tblib                     1.7.0              pyhd8ed1ab_0    conda-forge
terminado                 0.17.1             pyhd1c38e8_0    conda-forge
tinycss2                  1.2.1              pyhd8ed1ab_0    conda-forge
tk                        8.6.12               h5dbffcc_0    conda-forge
toolz                     0.12.0             pyhd8ed1ab_0    conda-forge
tornado                   6.3              py39ha30fb19_0    conda-forge
tqdm                      4.65.0             pyhd8ed1ab_1    conda-forge
traitlets                 5.9.0              pyhd8ed1ab_0    conda-forge
typing-extensions         4.5.0                hd8ed1ab_0    conda-forge
typing_extensions         4.5.0              pyha770c72_0    conda-forge
tzdata                    2023c                h71feb2d_0    conda-forge
unicodedata2              15.0.0           py39ha30fb19_0    conda-forge
urllib3                   1.26.15            pyhd8ed1ab_0    conda-forge
wcwidth                   0.2.6              pyhd8ed1ab_0    conda-forge
webencodings              0.5.1                      py_1    conda-forge
websocket-client          1.5.1              pyhd8ed1ab_0    conda-forge
wheel                     0.40.0             pyhd8ed1ab_0    conda-forge
xarray                    2023.4.2           pyhd8ed1ab_0    conda-forge
xorg-libxau               1.0.9                h35c211d_0    conda-forge
xorg-libxdmcp             1.1.3                h35c211d_0    conda-forge
xz                        5.2.6                h775f41a_0    conda-forge
yaml                      0.2.5                h0d85af4_2    conda-forge
zeromq                    4.3.4                he49afe7_1    conda-forge
zict                      3.0.0              pyhd8ed1ab_0    conda-forge
zipp                      3.15.0             pyhd8ed1ab_0    conda-forge
zstd                      1.5.2                hbc0c0cd_6    conda-forge
jbednar commented 1 year ago

I think the issue is in Datashader rather than HoloViews since I sometimes see no output returned from executing the pure Datashader code above, but I've included the HoloViews code because it's the only way I've found to reliably reproduce the error.

ianthomas23 commented 1 year ago

This is another example of the jupyter_client 8 issue that we have seen many times. For example at https://github.com/holoviz/holoviews/issues/5699#issuecomment-1564069110.

It is nothing to do with datashader. Datashader doesn't understand anything about sending/receiving data from a web brower, this is all handled by HoloViews.

jbednar commented 1 year ago

Agreed. In the past I believe a problem invoking Datashader did lead to empty responses, but in this case I agree it turns out to have been the jupyter_client 8 issue (https://github.com/jupyter/notebook/issues/6748).