jm + vldb   1

_Optimal Probabilistic Cache Stampede Prevention_ [pdf]
'When a frequently-accessed cache item expires, multiple requests
to that item can trigger a cache miss and start regenerating
that same item at the same time. This phenomenon,
known as cache stampede, severely limits the performance
of databases and web servers. A natural countermeasure to
this issue is to let the processes that perform such requests
to randomly ask for a regeneration before the expiration
time of the item. In this paper we give optimal algorithms
for performing such probabilistic early expirations. Our algorithms
are theoretically optimal and have much better
performances than other solutions used in real-world applications.'

(via Marc Brooker)
via:marcbrooker  caching  caches  algorithm  probabilistic  expiration  vldb  papers  expiry  cache-miss  stampedes 
10 weeks ago by jm

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