Github user shaneknapp commented on the issue: https://github.com/apache/spark/pull/21939 test builds started (on ubuntu). if these pass, i will feel comfortable performing the same installation/upgrade steps on the centos workers. upgrade/installation commands: conda install python==3.5 conda install pyarrow=0.10.* -c conda-forge -n py3k pip install sphinx builds: https://amplab.cs.berkeley.edu/jenkins/view/RISELab%20Infra/job/spark-master-test-sbt-hadoop-2.6-ubuntu-test/899/ https://amplab.cs.berkeley.edu/jenkins/view/RISELab%20Infra/job/ubuntuSparkPRB/66/ hopefully python3.5 won't break anything! please hold for ~4.5 hours. ;)
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