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Can we use different triple stores for Wikibase & the query service?
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Description

Currently the triple store for the WDQS is blazegraph.

How hard would this be to change / use another store?
What modifications have been made to blazegraph in order to work for wikibase?

We need to ask @Smalyshev if he can help.

Event Timeline

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptApr 23 2018, 2:15 PM
Addshore renamed this task from Can we use different triple stores for the same or separate Wikibase instances to Can we use different triple stores for Wikibase & the query service?.Apr 24 2018, 6:02 AM
Addshore updated the task description. (Show Details)
Addshore edited subscribers, added: Smalyshev; removed: Stas.
Restricted Application added projects: Wikidata, Discovery. · View Herald TranscriptApr 24 2018, 6:03 AM

How hard would this be to change / use another store?

Depends on which functionality you want to keep. If 100% of it, no other triple store has it out of the box. Some might be possible to amend to have some of it.
If only purely standard SPARQL things (no extensions, no special services, etc.) then any standards-compliant triple store should work, provided it can handle our dates (they are wider range than many implementations - including Blazegraph by default) can handle. I don't think there is other non-standard thing that is not listed in extensions.

How hard would this be to change / use another store?

Depends on which functionality you want to keep. If 100% of it, no other triple store has it out of the box. Some might be possible to amend to have some of it.
If only purely standard SPARQL things (no extensions, no special services, etc.) then any standards-compliant triple store should work, provided it can handle our dates (they are wider range than many implementations - including Blazegraph by default) can handle. I don't think there is other non-standard thing that is not listed in extensions.

Would any other standard triple store with just standard things work for most standard SPARQL queries then? (Ignoring services etc.?)
Is there a list documented of the things that we have modified on our version of blazegraph? such as dates and the services added?

Smalyshev added a comment.EditedApr 24 2018, 6:42 AM

Would any other standard triple store with just standard things work for most standard SPARQL queries then

Should work. I don't see any reason why they wouldn't.

Is there a list documented of the things that we have modified on our version of blazegraph? such as dates and the services added?

Yes, as linked above: https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Extensions

There are more things, but mostly performance tweaks not visible to the user and irrelevant for stores other than Blazegraph.

Addshore closed this task as Resolved.Apr 24 2018, 7:02 AM
Addshore assigned this task to Smalyshev.
Addshore moved this task from To Do to DEPRECATED - Done on the Wikibase-UserGroup board.