[Wikidata-bugs] [Maniphest] [Created] T199916: query.wikidata.org returning different results when re-running a query, though the data is unchanged

Wed, 18 Jul 2018 07:29:39 -0700

mhl20 created this task.
mhl20 added a project: Wikidata-Query-Service.
Herald added a subscriber: Aklapper.
Herald added a project: Wikidata.

TASK DESCRIPTION

On repeatedly re-running this SPARQL query on query.wikidata.org, I'm seeing inconsistent results between runs which aren't due to changes to the items being returned:

http://tinyurl.com/ydg868kc

For example, sometimes, when trying over the last hour:

  • It returns 1445 results, including the person wd:Q21747014
  • It returns 1441 results, not including the person wd:Q21747014

This is rather worrying, since it seems like we can't trust the results from the query service at the moment, and it creates the risk that a tool we're developing won't realise that certain statements already in Wikidata and adds a duplicate.

Is this a known problem, and is there any workaround?

Many thanks for any advice...


TASK DETAIL
https://phabricator.wikimedia.org/T199916

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To: mhl20
Cc: mhl20, Aklapper, Lahi, Gq86, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, Jonas, Xmlizer, jkroll, Smalyshev, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Mbch331
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