Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/4989#issuecomment-78522573
Yeah, the main thing here is that you do not want user B to be able to
modify user A's files. I understand your patch doesn't change the default case,
but I wonder what's your motivation for not configuring your daemons
appropriately instead?
With HDFS in mind, you'd have:
- user "spark" belonging to group "spark"
- /event_log_dir permissions 1777 owned by "spark:spark"
- Master and HistoryServer running as user "spark"
- Users don't need to belong to group "spark" at all.
Or maybe you're not using HDFS to store the logs?
With this configuration files / directories created under the event log dir
will belong to "user:spark" and everything should work as planned. Note this is
a little different than what a POSIX fs would do - a POSIX fs would require
"5777" permissions for this but HDFS doesn't support that.
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