Fabio Sangiovanni wrote:
> I'm a newbie of pdns and I'm setting up a recursor-only installation as local
> dns cache for a high load smtp server.
> I'm using the lua scripting feature as a way to track down MX queries. In
> particular, the preresolve() function relies on luasql to execute queries on
> a (local) mysql database.
> This is my problem: if I enable more than one thread in recursor.conf I get
> the lua script loaded more than once, and ultimately concurrent queries to
> the db that could mess up the stored data, depending on the execution order
> of select and update queries by the various threads.
> I'd like to avoid circumventing these race conditions through complicated lua
> coding, and instead I'd prefer to keep things as simple as possible and limit
> the number of pdns threads to just 1 ("threads=1" setting in recursor.conf).
> I know that the lua feature is not meant to be used this way, but this could
> really help me solving a big problem :)
>
> Now my questions are:
> am I right thinking this would solve my problem?
> how deep is the impact on performances changing the number of threads from 2
> (default setting) to just 1?
> are there other sensible settings that I could adjust to better suit my needs?
Wouldn't using database transactions solve your integrity problem?
Nils.
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