Github user shaneknapp commented on the issue:
https://github.com/apache/spark/pull/21939
my message to dev@:
```
well... i've been running in to problems (aka dependency hell), and just
hit a show-stopper:
UnsatisfiableError: The following specifications were found to be in
conflict:
- pyarrow 0.10.* -> arrow-cpp 0.10.0.* -> python >=2.7,<2.8.0a0
- python 3.4*
Use "conda info <package>" to see the dependencies for each package.
yep, we're testing against python 3.4, and pyarrow 0.10.0 needs 3.5+
putting the workers back on-line until i figure out what to do next.
```
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