Options: prefetch and python module

Wouter Wijngaards wouter at nlnetlabs.nl
Mon Nov 18 09:19:59 UTC 2019

Hi Eduard,

On 11/17/19 6:19 PM, Eduard Ahmatgareev via Unbound-users wrote:
> Hi all,
> I got a question regarding option: prefetch yes
> We use  python module for add specific domain to pass the traffic over
> our servers. I found that option: prefetch was enabled in our infra, and
> from time to time we had an issue with rule inside firewall which was
> created over python module
> My question is:
> does python-module call when prefetch is enabled? 

Yes, like normal.  For the modules this is like a normal lookup.  It
just happens earlier, and during cache storage special rules are used
for prefetch-storage while the old data is still in cache.  The module
done event is also like normal, I think.

Best regards, Wouter

> from documentation I found:
> prefetch: /<yes/ /or/ /no>/
>               If yes, message cache elements are prefetched before they expire
>               to keep the cache up to date.  Default is  no.   Turning  it  on
>               gives about 10 percent more traffic and load on the machine, but
>               popular items do not expire from the cache.
> and looks like in our configuration we have an issue with section:
> MODULE_EVENT_MODDONE which is not calls when prefetch enabled
> Is it true?

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