On 7/24/20 3:18 PM, Ryan Kemper wrote:
> Hi all,
>
> We experienced WDQS service disruptions on 2020/07/23. As a result
> there was a full outage (inability to respond to all queries) for a
> period of several minutes, and a more extended period of
> intermittently degraded service (inability to respond to a subset of
> queries) for 1-2 hours.
>
> The full incident report is available here:
> https://wikitech.wikimedia.org/wiki/Incident_documentation/20200723-wdqs-outage
>
> Ultimately, we traced the proximate cause to a series of
> non-performant queries, which caused a deadlock in blazegraph, the
> backend for WDQS. We have placed a temporary block on the IP address
> in question and are taking steps to better define service availability
> expectations as well as processes to make detection of these events
> more streamlined going forward.


What was the problem query?

I ask because I would like to try it against our Wikidata endpoint at:
https://wikidata.demo.openlinksw.com/sparql .

We have an "Anytime Query" feature designed for these kinds of problems,
hence the  vested interest in these kinds of problem queries.

--
Regards,

Kingsley Idehen       
Founder & CEO
OpenLink Software   
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