builds seem to be failing as python isn't there any more., e.g https://github.com/apache/hadoop/pull/6755:
[INFO] --- exec-maven-plugin:1.3.1:exec (shelldocs) @ hadoop-common --- tar: apache-yetus-0.14.0/lib/precommit/qbt.sh: Cannot create symlink to 'test-patch.sh': No such file or directory tar: Exiting with failure status due to previous errors /usr/bin/env: 'python3': No such file or directory
