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
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