I need to know
1. groups hortonworks for their user.
2. installed everything by root user, is any file, (dir is file) I need to chmod, chown?
Ambari will take care of user and group creation once you start deploying the cluster
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thank you Neeraj, so any user can log on do anything with Hortonworks without su - xxx?
@Robin Dong The initial question was not clear. The main group is hadoop. You can setup permissions at directory and file level for users.
Check this https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/FileSystemShell.html
Look for chmod and chown commands