[Pdns-users] 5001 questions waiting for database attention. Limit is 5000, respawning

[Cody]

I could be mistaken but I think the verbiage used ("database") is just
referring to the backend.

Are you certain that the stuff you're piping queries to isn't hanging /
having any issues in that regard? I know you mentioned you're running
having caching however on the outset it sounds like the issue might be
there.

What's your pipe-timeout set to?

Lastly you might want to check the performance tuning docs:
https://doc.powerdns.com/md/authoritative/performance/

On Wednesday, August 19, 2015, Stan Weatherby <stan at weatherby1.com> wrote:

> Hello,
>
> We are experiencing a very strange issue. Our PDNSD servers keep getting
> the error: 5001 questions waiting for database attention. Limit is 5000,
> respawning which is killing the answer side.
>
> Here is the strange thing, we are not using the MySQL backend, we are
> using the pipe backend and running heavy cache. In the config file we do
> not ask to load MySQL just “pipe”, has anyone else experienced this issue?
> We see this happen on loads of about 50 requests per second CPU - RAM - and
> all other system resources are running at a nominal load.
>
> Maybe we are missing some performance tuning? Still wondering why PDNSD is
> looking for the DB.
>
> Stan Weatherby
>
>
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