Using getaddrinfo_a on configuration load (1 reply)

Hi!

I've searched the list and not found much on lengthy HAProxy
start/config load times. We tend to run HAProxy with a large number of
backends (100+), and recently noticed that we are seeing lengthy reload
times (20+ seconds). This is most noticeable in locations that are far
away from our DNS server. We've traced this back to HAProxy doing
sequential DNS lookup, one address at a time, and the long RTT to our
DNS servers (~200ms). As such, load times tend to be N*M ms, where N is
the number of backends and M is the RTT to the DNS server.

While searching the mailing list, there was a little discussion about
using getaddrinfo_a for making DNS queries asynchronous. I can not find
any signs of this work in the latest development branch release. Is
anyone currently working on it, and if not, is it something that the
project would be interested in seeing?

Cheers,
Cyrus

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Cyrus Hall | Lead Software Engineer | Twitch | 720-327-0344 |
cyrus@twitch.tv