DNS problem

ywsample ywsample at gmail.com
Sun Aug 17 06:37:46 UTC 2014

I know nginx 1.7.4 fixes a bug about DNS resolver, but i do not quite
understand why this would lead to a request hang, Because there is a
timeout handling, at a specified time if there is no response the timeout
callback will be called,so why here can lead to request hang,

Could someone show me a example about how lead to request hang?

I ask this,because i recently encountered a problem online product(it use
nginx-1.7.2), may be caused by this problem

ywsample :)
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