Tracker and NFS (was Re: New module proposal: tracker)

[Rob Taylor <rob taylor codethink co uk>]

Bastien Nocera wrote:
> On Fri, 2009-11-06 at 19:11 +0100, Philip Van Hoof wrote:
>> On Fri, 2009-11-06 at 17:57 +0000, Bastien Nocera wrote:
>>> On Fri, 2009-11-06 at 18:53 +0100, Philip Van Hoof wrote:
>>>> On Fri, 2009-11-06 at 09:28 -0600, Shaun McCance wrote:
>>>>>> Surely apps should ship pre-indexed help files? Or at least do the
>>>>>> indexing at install time when installing from tarballs.
>>>>> All right.  Is there a suitable open format for that?  
>>>> Yes, the format for pre-installed content is Turtle. You have a command-
>>>> line tool and a DBus API to instruct tracker-store to import such a
>>>> Turtle file.
>>>>
>>>> You can for example in the postinst of a package do this.
>>> There's a tracker-store listening system-wide?
>> Hmm, that's a good point. 
>>
>> I guess you'll have to iterate over all users and foreach
>>
>>  su $user -c tracker-sparql -q -u $qry
>>
>> I understand that this is not nice :(. But indeed, tracker-store isn't
>> system-wide, instead it's per user.
> 
> That won't work because you won't have access to the session D-Bus, and
> certainly wouldn't work with, say, 1k users with NFS home dirs.

Taking this in a slightly different direction, in the Codethink office
we've been considering the network case. For thin client systems we
think it'd make more sense to run the indexer on the file server and,
instead of running a local tracker-store, have a dbus service that
provides the same interface but does the query remotely on the server.

Of course, this starts to lead us into the permissions side of RDF (aka
quad stores) which is currently a) unimplemented in Tracker and b) needs
 quite a bit of thought.

Thanks,
Rob

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-- 
Rob Taylor, Codethink Ltd. - http://codethink.co.uk