Github user shaneknapp commented on the issue: https://github.com/apache/spark/pull/21939 my PRB fork passed w/python3.5: https://amplab.cs.berkeley.edu/jenkins/view/RISELab%20Infra/job/ubuntuSparkPRB/68 this increases my confidence for a python3.5 upgrade on the centos workers, but i'd like to do a bit more testing (as well as reach out to the dev@ list for feedback) before we pull the trigger... next steps: * i created a symlink for python3.4 -> python3.5 on my testing build node and just launched another PRB to test and see that nothing weird happens (https://amplab.cs.berkeley.edu/jenkins/view/RISELab%20Infra/job/ubuntuSparkPRB/69). so far it looks good. * issue created: https://issues.apache.org/jira/browse/SPARK-25079 * i created a PR for the impending 3.5 bump. it won't impact existing PRB builds: https://github.com/apache/spark/pull/22061
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