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Not to mention the dudes and dudettes who generate region UUIDs by
hand... (a-hem)<br>
Purely random UUIDs that don't encode higher-order information are too
fragile when there is a chance that people will get their hands on
them. I'm not even talking about malicious manipulation, just simple
human intervention.<br>
<br>
Frisby, Adam wrote:
<blockquote
cite="mid:63FAD4F222230A4EA79DE9E8BE6647352BE843@winxbeus19.exchange.xchg"
type="cite">
<pre wrap="">Yeah, the reason I said 'almost' wasn’t because of a good UUID generator, - it's the bad ones.
IE, people using bad random sources, etc which dramatically increase the chance of a collision - ie if you are only getting 30 bits of randomness, you could run into a collision fairly quickly.
Adam
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:opensim-users-bounces@lists.berlios.de">opensim-users-bounces@lists.berlios.de</a> [<a class="moz-txt-link-freetext" href="mailto:opensim-users">mailto:opensim-users</a>-
<a class="moz-txt-link-abbreviated" href="mailto:bounces@lists.berlios.de">bounces@lists.berlios.de</a>] On Behalf Of Sean Dague
Sent: Friday, 31 October 2008 4:48 PM
To: <a class="moz-txt-link-abbreviated" href="mailto:opensim-users@lists.berlios.de">opensim-users@lists.berlios.de</a>
Subject: Re: [Opensim-users] [Opensim-dev] Grid Numberging
Dr Scofield wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Frisby, Adam wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Shouldn’t UUIDs by definition be unique?
IE – if your generating them randomly a collision is almost
guaranteed to never ever occur.
</pre>
</blockquote>
<pre wrap="">"almost" being a key word here...
</pre>
</blockquote>
<pre wrap="">"...after generating 1 billion UUIDs every second for the next 100
years, the probability of creating just one duplicate would be about
50%. The probability of one duplicate would be about 50% if every
person on earth owns 600 million UUIDs.<a class="moz-txt-link-rfc2396E" href="http://en.wikipedia.org/wiki/UuidJusttokeep">"
http://en.wikipedia.org/wiki/Uuid
Just to keep "</a>almost" in perspective,
-Sean
--
Sean Dague / Neas Bade
<a class="moz-txt-link-abbreviated" href="mailto:sdague@gmail.com">sdague@gmail.com</a>
<a class="moz-txt-link-freetext" href="http://dague.net">http://dague.net</a>
</pre>
</blockquote>
<pre wrap=""><!---->
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</pre>
</blockquote>
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