Hi,

I think I know the cause here as I reviewed the change likely causing this (I thought it wouldn't have a measurable performance impact as Sites are being loaded anyway... Seems I was wrong there).
I will have another look at this soon and try to cache things on another layer so that we don't have to pull Sites that often.

Thank you for bringing this up.

Cheers,

Marius

On 5. September 2014 20:25:49 EDT, Ori Livneh <ori@wikimedia.org> wrote:
In November of last year, Aaron noticed a spike in memcached traffic, which we were eventually able to attribute to Wikibase client fetching the SiteList on every request. When Katie fixed it, outbound memcached traffic nearly halved.

We're now back to the same rate of outbound traffic as then, and the culprit appears to be the same key.

See: http://i.imgur.com/v9ebld6.png

Tracked in https://bugzilla.wikimedia.org/show_bug.cgi?id=56602


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