On Fri, Mar 20, 2015 at 12:44 PM, Pablo Estrada <[email protected]>
wrote:
> Hi guys,
> I have a couple questions then
>
>> We would really suggest changing the current server,
>> as building a new server will probably not be as sustainable.
>>
> I understand, and agree. : )
>
> I see that the dbpedia-live-mirror feeder already updates the triple store
> for the Virtuoso server that runs the SPARQL endpoint. Does it do that
> through SPARQL *update* queries? (i.e. 1. Get new changeset; 2. Convert
> the changes in the changeset to SPARQL update queries; 3. Run the queries
> on the SPARQL endpoint; 4. The endpoint is now updated)
>
Exactly
> If that's the case, then the change to Server.js would have to do one of
> the following:
> 1. Update the HDT file (According to What is HDT
> <http://www.rdfhdt.org/what-is-hdt/>, HDF is a read-only format, so it
> might not be feasible).
> 2. Possibly, keep an in-memory cache of triples, where we would keep
> modified triples permanently (This could potentially raise the memory
> requirements of the server...)
> 3. Keep a file in disk, in a format that can be written to/read from
> efficiently, and keep information about updated triples here (This seems
> like a reasonable option...)
> 4. Maybe something else. Suggestions?
>
(Ruben can answer this one better)
> If that's the case, then to 'start up' a 'Live' TPFS, we need to know the
> time when the HDT file was generated, and then we need to run the 'triple
> update' function over all the triples that have been changed since then.
> Correct? (This would make startup potentially quite slow, but I guess
> that's okay).
>
The way we do this with the existing mirror is to store the timestamp of
the latest change file that was applied, otherwise you might get into clock
synchronization issues
>
> Does this make sense? Am I following the right leads? : )
> Regards
>
> Pablo
>
--
Kontokostas Dimitris
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