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 <[email protected]> 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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