[jira] [Created] (ARROW-1554) "ImportError: DLL load failed: The specified module could not be found" on Windows 10

["Dima Ryazanov (JIRA)" <ji...@apache.org>]

Dima Ryazanov created ARROW-1554:
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             Summary: "ImportError: DLL load failed: The specified module could not be found" on Windows 10
                 Key: ARROW-1554
                 URL: https://issues.apache.org/jira/browse/ARROW-1554
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 0.7.0, 0.6.0, 0.5.0
         Environment: Windows 10 (x64)
Python 3.6.2 (x64)
            Reporter: Dima Ryazanov


I just tried pyarrow on Windows 10, and it fails to import for me:

>>> import pyarrow
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python36\lib\site-packages\pyarrow\__init__.py", line 32, in <module>
    from pyarrow.lib import cpu_count, set_cpu_count
ImportError: DLL load failed: The specified module could not be found.

Not sure which DLL is failing, but I do see some DLLs in the pyarrow folder:

C:\Users\dima\Documents>dir "C:\Program Files\Python36\lib\site-packages\pyarrow\"
 Volume in drive C has no label.
 Volume Serial Number is 4CE9-CC3C

 Directory of C:\Program Files\Python36\lib\site-packages\pyarrow

09/19/2017  01:14 AM    <DIR>          .
09/19/2017  01:14 AM    <DIR>          ..
09/19/2017  01:14 AM         2,382,336 arrow.dll
09/19/2017  01:14 AM           604,160 arrow_python.dll
09/19/2017  01:14 AM             3,402 compat.py
...

However, I cannot open them using ctypes.cdll. I wonder if some dependency is missing?

>>> open('C:\\Program Files\\Python36\\Lib\\site-packages\\pyarrow\\parquet.dll', 'rb')
<_io.BufferedReader name='C:\\Program Files\\Python36\\Lib\\site-packages\\pyarrow\\parquet.dll'>
>>>
>>> cdll.LoadLibrary('C:\\Program Files\\Python36\\Lib\\site-packages\\pyarrow\\parquet.dll')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Program Files\Python36\lib\ctypes\__init__.py", line 426, in LoadLibrary
    return self._dlltype(name)
  File "C:\Program Files\Python36\lib\ctypes\__init__.py", line 348, in __init__
    self._handle = _dlopen(self._name, mode)
OSError: [WinError 126] The specified module could not be found



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