从 9万 QPS 到 6千：一次压测暴露的 15 倍性能黑洞，我们如何用 OpenResty XRay 定位根因
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Lua Resty DNS Library
Yichun Zhang , 12 Nov 2012 (created 12 Nov 2012)Nonblocking DNS (Domain Name System) resolver for Lua Nginx Module based on the cosocket API.
Project homepage: https://github.com/agentzh/lua-resty-dns
This library is enabled by default. You can specify the --without-lua_resty_dns option
to OpenResty's ./configure script to explicitly disable it.
