Hi, I'm interested in what happens when a freshly created evdns with more than one nameserver encounters a timeout on the first request.
It seems evdns distinguishes between retransmits and reissues. Retransmits are triggered by timeouts and always point to the same ns, chosen at first-transmit time. Reissues, on the other hand, are triggered by bad responses from nameservers, like NOTIMPL or REFUSED, and do cause a new ns to be picked in a round-robin fashion. The net effect is that on a fresh evdns with 2 nameservers, a single evdns_resolve is tried only against one nameserver. A second evdns_resolve is needed to talk to the second ns. This is different from glibc (2.7), where a new nameserver appears to be chosen before each retransmit. I'm not sure whether glibc makes any distinction between retransmit and reissue. Can anyone comment on these semantics? What was the rationale? Is there any way to get evdns to behave like glibc without significant code changes? (I don't see anything obvious in evdns_set_option.) Catalin
