Module:Yesno and Module:Category_handler on enwiki are having their text fetched hundreds (e.g. ~250) of times per second from memcached. Many of these come from apaches (not just jobrunners).
Typical trace:
10:14:46 PM ori#0 MemcachedPeclBagOStuff->get(enwiki:revisiontext:textid:664533748) called at [/srv/mediawiki/php-1.26wmf7/includes/Revision.php:1515] 10:14:46 PM ori#1 Revision->loadText() called at [/srv/mediawiki/php-1.26wmf7/includes/Revision.php:1071] 10:14:46 PM ori#2 Revision->getContentInternal() called at [/srv/mediawiki/php-1.26wmf7/includes/Revision.php:1027] 10:14:48 PM ori#3 Revision->getContent() called at [/srv/mediawiki/php-1.26wmf7/includes/parser/Parser.php:3985] 10:14:50 PM ori#4 Parser::statelessFetchTemplate(Module:Yesno, Object of class Parser could not be converted to string) called at [/srv/mediawiki/php-1.26wmf7/includes/parser/Parser.php:3901] 10:14:52 PM ori#5 Parser->fetchTemplateAndTitle(Module:Yesno) called at [/srv/mediawiki/php-1.26wmf7/extensions/Scribunto/common/Base.php:153] 10:14:54 PM ori#6 ScribuntoEngineBase->fetchModuleFromParser(Module:Yesno) called at [/srv/mediawiki/php-1.26wmf7/extensions/Scribunto/engines/LuaCommon/LuaCommon.php:509]
We should figure out:
a) Why this happens (is it low parser output TTLs due to some bug or magic word)
b) If it is normal, whether to find ways to reduce traffic (e.g. APC). We should be careful since APC does not have smart eviction though.