Unfortuantely I don't think it works that way. Warm restart is useful for
upgrading or slightly changing the configuration of an independent cache
node without losing the data.
However since you're expanding and contracting a cluster, keys get
remapped inbetween hosts. If you're saving the data of a downed machine
and bringing it back up later, you will have stale cache and still cause
some extra cache misses.
As an aside you should be autoscaling based on cache hit/miss rate and not
the number of requests, unless your rate is huge memcached will scale
traffic very well. Hopefully you're already doing that :)
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