Oh, I see what you're getting at: you're asking me if B will still be in the cache if A is still in the cache. That depends on whether or not the keys hash to the same Memcache instance.
FYI - in general, we don't make any guarantees of this behavior, so it potentially can be problematic down the line if this changes. Ikai Lan Developer Programs Engineer, Google App Engine Blog: http://googleappengine.blogspot.com Twitter: http://twitter.com/app_engine Reddit: http://www.reddit.com/r/appengine On Fri, Jul 22, 2011 at 1:52 PM, Ikai Lan (Google) <ika...@google.com>wrote: > Memcache works like an LRU cache, but I don't see why a would force out b > unless you ran out of space. > > Also, App Engine's Memcache has 2 LRU structures: an app specific LRU and a > global LRU for that Memcache instance. > > Ikai Lan > Developer Programs Engineer, Google App Engine > Blog: http://googleappengine.blogspot.com > Twitter: http://twitter.com/app_engine > Reddit: http://www.reddit.com/r/appengine > > > > On Fri, Jul 22, 2011 at 1:05 PM, Andrin von Rechenberg <andri...@gmail.com > > wrote: > >> Hey there >> >> I'm building something like "Google Analytics" for Appengine but in real >> time >> (Including qps, hourly & daily graphs, backend counters, monitors with >> alerts, etc...) >> The cool thing is that it only uses memcache to increase counters/stats so >> its >> really quick to use in prod code. Every minute I gather all counters and >> write them to datastore. >> It seems to work perfectly for my app (~250qps with about 1000 different >> counters, and about >> 1000 counter increases per second) >> I can also measure how correct my data is (if stuff flushed in memcache, >> but so far that never happened), >> but it's all based on one assumption: >> >> If I call: >> >> memcache.incr("a", intitail_value=0) >> ... >> memcache.incr("b", initial_value=0) >> .... >> memcache.incr("b", initial_value=0) >> .... >> >> *if "a" is still in the memcache "b" will also be in the memcache and >> wont have been flushed, correct?* >> * >> * >> or in other words: If the entity size for two items in the memcache is the >> same, >> does the memcache work like either a LRU or FIFO cache? >> >> Any response is greatly appreciated... >> >> -Andrin >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Google App Engine" group. >> To post to this group, send email to google-appengine@googlegroups.com. >> To unsubscribe from this group, send email to >> google-appengine+unsubscr...@googlegroups.com. >> For more options, visit this group at >> http://groups.google.com/group/google-appengine?hl=en. >> > > -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
