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----- Original Message ----- From: "Dean Anderson" <[email protected]> To: "Mark Boolootian" <[email protected]> Cc: <[email protected]> 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
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