Consider increasing Cassandra `system_auth` replication
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	Eevans
	Feb 23 2017, 8:54 PM

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In the past, a common recommendation was to set the system_auth replication factor to the number of nodes, the current recommendation seems to be 3 to 5 per data-center. We are currently configured for 3 per data-center, the lower end of that recommendation, so it may be worth considering an increase.

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Mentioned In: T297483: Ensure that system tables are sufficiently replicated on the aqs_next Cassandra cluster
Mentioned Here: T157354: Bump replication factor of system.auth table in cassandra when new nodes have finished bootstrap

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Eevans created this task.Feb 23 2017, 8:54 PM

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Eevans triaged this task as Low priority.Feb 23 2017, 8:55 PM

• mobrovac edited projects, added Services (designing); removed Services.Feb 23 2017, 10:27 PM

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Eevans added a project: Wikimedia-Incident.Apr 21 2017, 4:14 PM

Eevans moved this task from Active investigation to Follow-up prevention on the Wikimedia-Incident board.

The RESTBase cluster has been using a replica count of 3 per data-center for most of the (almost) year since this issue was opened, with a number of topology changes/reshapes occurring since. I think this recommendation (which matches what we store our data at) is reasonable; Closing this issue.

Krinkle edited projects, added Sustainability (Incident Followup); removed Wikimedia-Incident.Apr 28 2020, 9:51 PM

BTullis mentioned this in T297483: Ensure that system tables are sufficiently replicated on the aqs_next Cassandra cluster.Dec 14 2021, 2:42 PM

Consider increasing Cassandra `system_auth` replicationClosed, ResolvedPublicActions

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Consider increasing Cassandra `system_auth` replication
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