I'm working on migrating an installation from PowerDNS 3.1 on Debian 7 "Wheezy" to PowerDNS 4.0.3 on Debian 9 "Stretch".

I'm using the MySQL backend, connected to MariaDB 10.1.30, which is not the Stretch default, but the one from the MariaDB repository. I've tried the Stretch default PowerDNS 4.0.3, as well as PowerDNS 4.0.5 and PowerDNS 4.1.0 from the PowerDNS repository, and had the same problem.

I think fundamentally the problem I'm having boils down to this: the first time PowerDNS makes a basic-query, everything is fine. Subsequent times, the response is somehow truncated, and/or a previously-seen SOA is returned.

It looks like the issue is between MariaDB and PowerDNS. I set up socat as a logging proxy and observed that the first time I trigger a PowerDNS basic-query via dig, the exchanged traffic is ~10K. The second time, it's ~4K.

If I kill the connection between PowerDNS and MariaDB, either by restarting MariaDB or simply by ordering MariaDB to kill the connection in use by PowerDNS, then the subsequent attempt fails because of the missing connection, but from then it's the same as the beginning: the next query after that will succeed and subsequent ones will fail.

From the MariaDB command line I can make the exact queries that PowerDNS is making, verified by the MariaDB query log. No problems there: no matter how many times I do that, I always get the full results.

I should mention that all my queries are stored procedures, in case that matters. This all has worked perfectly on 3.1.

Any tips on what I should try next?  Thanks!

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