md5 as the key

[Venkatesh KS]

folks,

memcached supports variable length keys. But I am just curious as to why not
use md5 instead of lengthy keys. The keylen requirements for my cache (which
is very similar to  squid proxy) is very high and I am planning on using
md5. I will read up to find out about the false positive probability. But
going md5 way will certainly cap the keylen to 16bytes.

regards,
-venkatesh
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