----- Original Message ----- From: "Dean Anderson" <dean@av8.com> To: "Mark Boolootian" <booloo@ucsc.edu> Cc: <Nanog@merit.edu> Sent: Tuesday, May 03, 2005 6:33 PM Subject: Re: [dnsop] DNS Anycast revisited (fwd)
On Tue, 3 May 2005, Mark Boolootian wrote:
Note the nonsense about anycast being "completely coherent".
If you check, I think you'll see that he actually said "ultradns's anycast for .ORG is completely coherent".
There seems to be no possibility for anycast to be "completely coherent", so ultradns' anycast couldn't be "completely coherent" either. But Vixie mentions it to respond to comments by others about Ultradns' particularly pervasive use of anycast.
it may not be possible to make every service *consistent*, but it is perfectly possible to make it coherent (i'm talking about coherency of copies of a shared resource). i'm curious to see how you can substantiate this claim, since any backend which supports distributed transaction semantics will give you this. i can't comment on the veracity of paul's statement comme applique ultradns, since i'm not familiar with how they do things, but that doesn't change the fact that you've just made a statement which appears blatantly false to anyone with any distributed systems experience. -p --- paul galynin