[dns-operations] prefetching and thundering herds

Tony Finch dot at dotat.at
Wed Jul 15 13:12:27 UTC 2020


Mark Delany <b9w at charlie.emu.st> wrote:
>
> I'm not sure how a stub cache could make things worse.

I'm wondering if the stub caches catch the queries that would otherwise
cause a prefetch, so instead of a newly hot cache in the recursive server,
the stubs encounter a high latency refill. But as you say, the unlucky
slow queries are probably not any more likely than they are without stub
caches.

Tony.
-- 
f.anthony.n.finch  <dot at dotat.at>  http://dotat.at/
Berwick upon Tweed to Whitby: Variable 3 or less, becoming west 3 or 4 for a
time. Smooth or slight. Occasional rain at first. Moderate becoming good.


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