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 Home Page: http://www.openlinksw.com Community Support: https://community.openlinksw.com Weblogs (Blogs): Company Blog: https://medium.com/openlink-software-blog Virtuoso Blog: https://medium.com/virtuoso-blog Data Access Drivers Blog: https://medium.com/openlink-odbc-jdbc-ado-net-data-access-drivers Personal Weblogs (Blogs): Medium Blog: https://medium.com/@kidehen Legacy Blogs: http://www.openlinksw.com/blog/~kidehen/ http://kidehen.blogspot.com Profile Pages: Pinterest: https://www.pinterest.com/kidehen/ Quora: https://www.quora.com/profile/Kingsley-Uyi-Idehen Twitter: https://twitter.com/kidehen Google+: https://plus.google.com/+KingsleyIdehen/about LinkedIn: http://www.linkedin.com/in/kidehen Web Identities (WebID): Personal: http://kingsley.idehen.net/public_home/kidehen/profile.ttl#i : http://id.myopenlink.net/DAV/home/KingsleyUyiIdehen/Public/kingsley.ttl#this
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