On Wed, Jan 19, 2022 at 04:54:25PM +0000, Clint Anderson via Pdns-users wrote:
> Otto & Walter - Thank you for the replies!
>
> Otto,
>
> My assumption was that the cache is the most efficient and if it was in the
> cache, it would return the cached answer and never go looking for an update.
> Thank you for the clarification on the zoneToCache functionality, seems I was
> barking up the wrong tree.
To elaborate on this a bit: yes, if an answer is in the cache it will
be used. But records do not stay in the cache forever: cache entries
will be evicted if the cache gets too full. The decision which
records are evicted is based on method taking both TLLs and LRU into
account.
Additionally, replacing records in the cache will cause issues if
DNSSEC validation is enforced and the domain the alternative records
are in is DNSSEC protected: the records will be marked as Bogus and
not be served to clients.
-Otto
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