id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
34806	Make cached_db backend resilient to cache backend errors	Claude Paroz	Sulabh Katila	"In the case storing the session data in the cache for the `cached_db` backend is failing, this should not make the whole request crash.

Use case: you add a big content to `messages.success`, bigger than what your configured cache backend can accept (e.g. obtaining a TooBig error with memcache). Then every future request from that session will crash.

I would suggest to log the failure instead of letting the cache backend exception crash the request, and continue with the request, as missing saving the session data in the cache is not a serious condition, it will only slow the requests a bit as the database will be hit each time until the issue is solved.  "	Cleanup/optimization	closed	contrib.sessions	dev	Normal	fixed			Ready for checkin	1	0	0	0	0	0