[dns-operations] Akamai's missing SOA bug fixed
dns at fl1ger.de
Thu Oct 5 05:36:30 UTC 2017
On 4 Oct 2017, at 19:56, David C Lawrence wrote:
> On Saturday at the DNS-OARC meeting, Ralf Weber of Nominum gave a very
> interesting presentation on cache performance. His slides are here:
> One of his observations was that he was getting a surprisingly high
> number of cache misses for Akamai names. He eventually tracked this
> down to uncacheable negative answers where our authorities had not
> included an SOA in the response. This was certainly a surprising
> finding to me, and so I got up to the mic and acknowledged it was
> unintentional and that we would endeavour to fix it quickly.
> The fix was deployed on Monday afternoon.
Thanks a lot for doing that and doing it so quick. It has a huge impact.
> It turns out that this was a bug introduced with a software release
> that completed on 30 August. It had not been present in previous
> releases. One of the nameservers team members noticed the problem and
> had already fixed it for the next software release, due imminently,
> but hadn't made the leap as to the implications for resolver caches.
The attached graph I grabbed from one server shows the authoritative
request over the last 90 days and shows a nearly 50% increase at peak
in September because of this. The last two days it has been back to
so thanks again for fixing this.
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