Oozie restarts Yarn and HDFS in the process of reinstalling it.

[#1]

I just reinstalled oozie on HDP 2.4. I am not clear why the process needs to restart YARN and HDFS. Any clue as to why oozie restarted the whole cluster?

[#2 · Accepted solution]

The oozie installation makes changes to the core-site.xml. Specifically the oozie user. needs to be able to impersonate other users so he can kick off a job as the user who owns the oozie flow. HDFS allows you to configure these powerful users in the proxyuser settings. So to enable that you need to restart HDFS and yarn.

hadoop.proxyuser.oozie.groups

hadoop.proxyuser.oozie.hosts

[#3]

Thank you @Benjamin Leonhardi