Github user wesm commented on the issue:
https://github.com/apache/spark/pull/15821
You must add the conda-forge channel; I also recommend increasing the
timeout for conda which helps make builds more stable, see:
https://github.com/apache/arrow/blob/master/ci/travis_install_conda.sh#L37
Also, I recommend updating to pyarrow 0.4.1 as soon as practical (only bug
fixes)
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