Is bind support conditionally resolution?

[Matus UHLAR - fantomas]

On 10.01.12 15:04, Drunkard Zhang wrote:
>I am designing a big deploy system, which will implement via DNS. The
>demond is misc, one of them is conditionally resolve, which means that
>if one CDN node near unavailable, or latency increased significantly,
>no matter why, I want bind to give another second best result, which
>located in distant places.
>
>Is bind support this natively? Or I have to write external program?

>If bind doesn't support, is there any other DNS impletions I can try?

DNS is bad place to do this. DNS is designed to provide consistent data 
and to provide them no matter if the sites are up or down.

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