[RFC] fastest mother-fucking journal ever

[fprochazka]

Inspiration: Cache – FileStorage without FileJournal with TAGS support – working solution

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Let's not delete the cache on invalidation and just let it rot untill it's deleted by itself or flushed on deployment. Let's say we instead of deleting the keys in database on invalidation, set some value that would mean some TAG was invalidated at that given time.

On read, there would be always check (there could be lua script doing this saving bandwidth) that the key has tags and if it has tags, than there would be check when was the last time the tag was deleted and if the cache entry is older then the flushing by tag, no value would be returned but instead the one entry will be deleted.

Garbage collection could be done using maxmemory=volatile-ttl as stated in #20

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someone must:

• impelement proof-of-concept
• test it on hight traffic site