Re: [Libevent-users] evdns timeout behaviour

[Catalin Patulea <catalinp@xxxxxxxxxx>]

On Sat, Jul 7, 2012 at 4:54 PM, Adrian Chadd <adrian@xxxxxxxxxxxxxxx> wrote:
> .. what do other operating systems do?
BTW, glibc has a "rotate" option that load-balances across the list of
nameservers - but this option only applies when starting a new lookup
[1]. In the timeout case, a new nameserver is always tried [2].

My understanding is that multiple nameservers in glibc were originally
intended for failover only, and client-side load-balancing (the rotate
option) was added later as a feature.

[1] http://sourceware.org/git/?p=glibc.git;a=blob;f=resolv/res_send.c;h=0a28cd784b99d45eb70150f3ac50b75b14203976;hb=HEAD#l460
[2] http://sourceware.org/git/?p=glibc.git;a=blob;f=resolv/res_send.c;h=0a28cd784b99d45eb70150f3ac50b75b14203976;hb=HEAD#l563
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