[Wikidata-bugs] [Maniphest] [Created] T205865: Investigate decrease in wikidata dispatch times due to eqiad -> codfw db switch

Mon, 01 Oct 2018 06:51:19 -0700

Addshore created this task.
Addshore added projects: Datacenter-Switchover-2018, Wikidata.
Restricted Application added a subscriber: Aklapper.

TASK DESCRIPTION

At the time of the eqiad -> codfw DC switch the average dispatch lag times for wikidata dropped from ~2.5 mins on average down to ~16 seconds.

This can be seen on https://grafana.wikimedia.org/dashboard/db/wikidata-dispatch?orgId=1&from=1535809586024&to=1538401586025

We should investigate what exactly caused this.

Looking at the metrics of the dispatching script it appears that the total amount of time spent selecting clients dramatically dropped.

https://grafana.wikimedia.org/dashboard/db/wikidata-dispatch-script?orgId=1&from=1536495649669&to=1537026325588


TASK DETAIL
https://phabricator.wikimedia.org/T205865

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To: Addshore
Cc: Addshore, Aklapper, Nandana, jijiki, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, Volans, Wikidata-bugs, aude, Mbch331, Krenair, akosiaris
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