Maniphest T256291

Clean up the /*/mw/ mcrouter routing prefix
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	RLazarus
	Jun 24 2020, 5:49 PM

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In profile::mediawiki::mcrouter_wancache we configure mcrouter with routes for /{eqiad,codfw}/mw/ (a DC-local cache) and /{eqiad,codfw}/mw-wan/ (the WAN cache, shared across data centers).

Word from @Krinkle is that /*/mw/ is probably unused. I'll double-check that nothing in prod is reading or writing via that prefix, then remove it from the config.

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RLazarus triaged this task as Low priority.Jun 24 2020, 5:49 PM

RLazarus created this task.

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJun 24 2020, 5:49 PM

/$dc/mw/ is the default prefix mcrouter adds to all keys that do not start with /, as you can see here

https://gerrit.wikimedia.org/r/plugins/gitiles/operations/puppet/+/refs/heads/production/modules/profile/manifests/mediawiki/mcrouter_wancache.pp#127

the region and cluster variables are used as --route-prefix arguments in the mcrouter templates, see

https://gerrit.wikimedia.org/r/plugins/gitiles/operations/puppet/+/refs/heads/production/modules/mcrouter/templates/default.erb#5

RLazarus closed this task as Invalid.Jul 28 2020, 1:46 PM