Tickets :: Comment on [#13085] Use memcache instead of distributed hashtable in $conf[cache][driver]

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Comment	>>>> That's true, but would it hurt to set the lifetime? All cache drivers >>>> will default to a lifetime of '0', which means data will never be GC. >>> >>> Memcache does not need GC and, thus, doesn't need lifetimes. >> >> This remark wasn't limited to memcache. Currently, the data that is >> stored in the cache by Horde_Service_Weather doesn't set a lifetime, >> which (if I understand correctly) means that it will never expire >> stay in the cache forever. > > It means it will never be GC'd. It will "expire" and be removed from > the cache if the code enforced lifetime (via ::get()) is reached. GC > is ONLY for the backend and even then there is no guarantee that a > given bit of data WILL be removed once the GC is reached - it only > flags it as being available for GC the next time the backend triggers > it's GC routine. > >> So while memcache may not need this, other >> cache drivers may in order for prevent the cache from filling up. For >> instance, with WeatherUnderground (if users don't configure a >> location in their preferences) the GeoIP lookups of mobile users may >> result in loads of entries. > > It depends. Only when a lifetime value of '0' is passed does this > mean that it is never marked for GC. If it is omitted (therefore > passing a null), it is marked for GC based on the configured default > GC lifetime.
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