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A comment on Dropbox traffic infrastructure: Edge network.

Re:Dropbox traffic infrastructure: Edge network by nodesocket on Wednesday October 10, 2018 @03:05PM (#18187920)
> DNS TTL is a lie. Even though we have TTL of one minute for www.dropbox.com, it still takes 15 minutes to drain 90% of traffic, and it may take a full hour to drain 95% of traffic.

Interesting, awhile back both Google and AWS engineers replied to a HN thread[1] saying TTL of 30 seconds or so works pretty responsibly and can be trusted and used. Seems to be some disagreement on this.

[1] https://news.ycombinator.com/item?id=17553043

[ Parent | on HN ]
Re:Dropbox traffic infrastructure: Edge network by SuspiciousSwan on Wednesday October 10, 2018 @03:09PM (#18187940)
It really depends who your clients are. If they are servers, 30s can work okay. If they are end users, caching happens all over. It's a huge PITA, especially since you'll run into podunk ISPs that have their own custom caching setup, but you have a customer with a shop there. Not that I'm still bitter.
[ Parent | on HN ]
Re:Dropbox traffic infrastructure: Edge network by SaveTheRbtz on Wednesday October 10, 2018 @03:37PM (#18188169)
It really depends on the clients, here is an excerpt from the article:

> Here we also need to mention the myriad embedded devices using Dropbox API that range from video cameras to smart fridges which have a tendency of resolving DNS addresses only during power-on.

[ Parent | on HN ]
Re:Dropbox traffic infrastructure: Edge network by bigiain on Wednesday October 10, 2018 @10:32PM (#18190630)
> which have a tendency of resolving DNS addresses only during power-on.

Facepalm...

[ Parent | on HN ]
Re:Dropbox traffic infrastructure: Edge network by aaronblohowiak on Wednesday October 10, 2018 @11:01PM (#18190712)
DNS TTL is a PITA for us at Netflix as well. We use Zuul to proxy cross-region for TTL "non-responders".
[ Parent | on HN ]
Re:Dropbox traffic infrastructure: Edge network by tyingq on Wednesday October 10, 2018 @07:59PM (#18189993)
It would be funny if part of what they are seeing is because the Dropbox client doesn't try reconnects or re-resolving very often.
[ Parent | on HN ]
Re:Dropbox traffic infrastructure: Edge network by patrickg_zill on Thursday October 11, 2018 @12:53AM (#18191037)
There's a lot of caching done by e.g. Comcast that does not always honor the TTL.
[ Parent | on HN ]