On Sun, Sep 11, 2016 at 06:23:05PM +0300, Viktor Velchev wrote: > Hello, > > I am running PowerDNS 4.0.1, which is complied from source with ZeroMQ > support in a Debian 8 environment. I am experimenting with Remote and I am > willing to write my own DNS storage (back-end), which connects to PowerDNS > through Remote. Changelogs for the newer PowerDNS versions do not give any > hints regarding the bellow described problem, so I think it is safe to > assume that the case will be the same with all available 4.0.x releases. > > I am launching a single Remote instance and several threads: > launch=remote > distributor-threads=4 > receiver-threads=4 > > Receiver and distributor thread count is just an example, the point is that > I am not running in single threaded mode. > > The main problem is that Remote itself does not give me any options to > create a multi-threaded back-end. I have checked the source and although > ZeroMQ is configured to start two I/O threads, but the implemented REQ/REP > pattern limits the communication to: > > 1. PowerDNS sends a request about a domain. > 2. PowerDNS waits (blocks) until it receives data about the domain. > > Once my back-end receives a request I am limited to either returning false > or replying. > I am pretty sure that the case is the same with the Unix socket connector. > I have NOT checked if the case is the same with the HTTP connector. > > My questions are: > 1. Is there a possibility to modify the communication pattern, so that > PowerDNS either submits multiple requests through Remote OR maybe add a > command which asks for a new query while the previous one is being executed? > 2. In case I have myself misunderstood the way PowerDNS operates, is there > a Remote connector which is suited for use in cases where the recipient > wants to handle multiple requests at a time? > > Best Regards, > Victor
Usually powerdns launches several backend threads, each working in blocking mode. Thus you will have concurrent requests running despite remotebackend only doing one request at a time. Aki _______________________________________________ Pdns-dev mailing list Pdns-dev@mailman.powerdns.com https://mailman.powerdns.com/mailman/listinfo/pdns-dev
