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https://issues.apache.org/jira/browse/HDFS-11400?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15861450#comment-15861450
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Hari Sekhon commented on HDFS-11400:
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bq. If I access a home dir as a privileged user (e.g., hdfs) then I'm not sure
why there would be a validation made against an individual user's external
existence.
That's not the use case - it's only when an actual user tries to do something
in hdfs and there is no home directory detected for that same user - this does
not apply to hdfs superuser operations at all - in fact validating "against an
external user's existence" when touching a home directory is the check in the
wrong direction entirely.
This is more for jobs run by a user for which a home dir wasn't set up (the
users just pop up and start using the cluster in large enterprises as they're
in some other part of the enterprise that you never see but are added in an AD
group that is allowed on the cluster - they could be new guys or just someone
you just never met because it's a big company).
bq. Whoever is building this on a per client basis ...
Ever tried copying your pre-written code from your github or private machine to
Banks, government environments and large traditional enterprises where
everything is firewalled off, the internet is blocked to server networks and
nothing is allowed in or out? Write it again :-/ . Most people in those types
of places just have a dumb sheet that they have to follow for every single
person who requests to use the cluster as their jobs fail otherwise... they're
lucky if somebody even scripts it for them.
Yes it's only a couple of commands but people in those types of environments
don't know anything - which may be hard to understand how bad it is if you're
used to working for tech startups with smart techies and little security - so
you have to script it again for them to happen behind the scenes.
bq. Also, doesn't the NN plugin system already give one a way to implement this
feature without clogging up the rest of the code base?
If such a plugin is bundled and available in core hdfs and enabled with a
simple config change then ok but otherwise that idea is Dead-on-Arrival in a
large chunk of verticals which do not allow downloading and installing random
things from the internet, which includes pretty much all banks in the world,
government departments and large traditional enterprises.
FYI in large environments the account validation and group memberships are
handled by people you never see through internal request systems, Hadoop
administrators never touch those things beyond the initial setup of which
groups are allowed on the cluster, from then onwards all new users and group
memberships etc are handled by Active Directory teams that you never see
because they're in some other part of the large organization, and possible in
different geographic locations.
> Automatic HDFS Home Directory Creation
> --------------------------------------
>
> Key: HDFS-11400
> URL: https://issues.apache.org/jira/browse/HDFS-11400
> Project: Hadoop HDFS
> Issue Type: New Feature
> Components: hdfs, namenode
> Affects Versions: 2.7.1
> Environment: HDP 2.4.2
> Reporter: Hari Sekhon
>
> Feature Request to add automatic home directory creation for HDFS users when
> they are first resolved by the NameNode if their home directory does not
> already exist, using configurable umask defaulting to 027.
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