DNS problem

[Ruslan Ermilov]

On Sun, Aug 17, 2014 at 02:37:46PM +0800, ywsample wrote:
> 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?

The requests would hang for 30 seconds instead of retrying a
DNS query periodically.

See http://mailman.nginx.org/pipermail/nginx/2014-July/044438.html
for details.

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