On Wed, Mar 16, 2016 at 10:50:55AM +1000,
 George Michaelson <g...@algebras.org> wrote 
 a message of 84 lines which said:

> How about if under load, a cache is permitted to convert NXDOMAIN
> ttl to 1/nth of the apparent ttl, based on some understood algorithm
> which relates to a load threshold?

IMHO, it is already allowed to do so at will. TTL have always been
_maximum_ time to live and a cache is free to _decrease_ the TTL (more
properly: to remove data before the TTL expiration) when it lacks
memory or for any other reason.

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