Expire cost to Redis
Tute
the expire command. Its expensive to Redis have a few thousands of key
running with an expire of 172800 seconds ?
Pieter Noordhuis
http://redis.io/topics/memory-optimization
Note that you can only group string values in a hash.
Cheers,
Pieter
On Wed, Feb 9, 2011 at 6:41 PM, Tute <tute....@gmail.com> wrote:
> What is less expensive to Redis to have? A big hash or a lot of keys ?
>
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Jay A. Kreibich
> Im going to move an odd mechanism from mysql to redis and I want to use
> the expire command. Its expensive to Redis have a few thousands of key
> running with an expire of 172800 seconds ?
If you're worried about some type of timer or garbage collector, it
isn't a big deal. From <http://redis.io/topics/expire>:
Enhanced Lazy Expiration algorithm
Redis does not constantly monitor keys that are going to be
expired. Keys are expired simply when some client tries to access a
key, and the key is found to be timed out.
Of course this is not enough as there are expired keys that will
never be accessed again. This keys should be expired anyway, so
once every second Redis test a few keys at random among keys with
an expire set. All the keys that are already expired are deleted
from the keyspace.
-j
--
Jay A. Kreibich < J A Y @ K R E I B I.C H >
"Intelligence is like underwear: it is important that you have it,
but showing it to the wrong people has the tendency to make them
feel uncomfortable." -- Angela Johnson
Tute
Pieter Noordhuis
timeouts, but when you're dealing with only a couple thousand expiring
keys, you're looking at less than 1MB of memory.
Cheers,
Pieter
