[Wikidata-bugs] [Maniphest] [Created] T206880: Investigate runaway Blazegraph threads

[Smalyshev]

Smalyshev created this task. Smalyshev added projects: Wikidata-Query-Service, Discovery-Wikidata-Query-Service-Sprint. Restricted Application added a subscriber: Aklapper. Restricted Application added a project: Wikidata.

TASK DESCRIPTION

We've had another case where Blazegraph gets to 10K threads and gets stuck there:

https://grafana.wikimedia.org/dashboard/db/wikidata-query-service?refresh=1m&orgId=1&panelId=22&fullscreen&var-cluster_name=wdqs&from=1538608015716&to=1538619913254

It would be good if we could figure out what caused it and how we could amend our configs to prevent this from happening.

TASK DETAIL

https://phabricator.wikimedia.org/T206880

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

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