cache miss even if the value exists?

[Nathan Schmidt]

It's certainly possible if you've subsequently written other keys to the
server and they push the original key out to make room for that newer
content. You'll usually keep your most frequently used keys since memcached
moves items down the priority list for flushing as they're fetched - if
you're not using expire flags it ends up being basically a
least-recently-used cache.
-n
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