Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21515
Problem solved. This script assumes the current user can run docker command
without `sudo`, while it may not be true. But we can't run this script with
root user as we can't add a root user in the docker container.
Following the steps in
https://docs.docker.com/install/linux/linux-postinstall/#manage-docker-as-a-non-root-user
solves it.
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