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From Doug Cutting <cutt...@apache.org>
Subject Re: Fwd: hadoop file permissions
Date Thu, 19 Apr 2007 21:11:42 GMT
Kurtis Heimerl wrote:
> Sounds like a reasonable thing. There's one problem here, that being that
> each user will require their own config file.

That's not needed.  The Configuration is a set of properties.  We can 
add a method FileSystem.getUsername(Configuration) that first looks in 
the configuration, and, if nothing is found, defaults to the environment 
variable.  Then FileSystem implementations can call this.  JobClient 
should call FileSystem.setUsername() before submitting a job.  So it's 
not normally in a config file, but is in the Configuration.

> There's accountability, but not great protection. If someone put their
> client into kerberos and it was accepted, they could take any role they
> wanted.

I'm not sure what you mean.  The server would need to validate the 
kerberos ticket with the kerberos server to check that users really are 
who they say they are.

> I think groups and root are easy, so I plan to implement those initially as
> well. Is there any more reasonable way to do root than just hardcoding that
> root can do anything? I thought about adding root to all groups, but 
> there's
> a chance that a file had no groups. I guess I could add one root group that
> simply contains root. That would allow the service to allow others to 
> run as
> root as well.

I think we should not try to re-invent too much, but mostly trust that 
the unix model is workable.  In unix, root can do anything.  I think we 
need that capability and should implement it similarly.


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