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<div class="moz-cite-prefix">RE: the per session uuid: I've looked
at the code recently, and I already don't recall the exact
details. :-) However, if you have libuuid installed, it (apr
and/or apr-util) defaults to using libuuid's functions and acts as
nothing more than a shim. I think part of the computation is
based upon /dev/urandom and part on the timestamp and possibly a
counter, but I might be merging things in my head incorrectly as
that might be the non-libuuid segment of the code... It's highly
random, but as with any finite set, there is always a remote
possibility of a collision.<br>
<br>
The FS core UUID is instantiated at start-up of FS, so every time
FS is restarted, it gets a new FS core UUID.<br>
<br>
-Yossi<br>
<br>
On 05/20/2013 07:18 AM, Michael Jerris wrote:<br>
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cite="mid:1B994D4B-F3E1-4492-85FB-26610F19BF49@jerris.com"
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The apr uuid stuff already has a portion of the uuid thats
per-instance. I've seen a lot of details in this thread that are
not accurate to my recollection of this code. Has anyone actually
dug in and looked at it? Its been a while by my recollection is
each instance gets a certain number of bits from random at
startup, then its a combination of time + counter. The only
collision possibility would be the random at startup portion which
would be much less likely than getting struck by lightning.
<div><br>
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<div>Mike</div>
<div><br>
<div>
<div>On May 20, 2013, at 2:20 AM, Steven Ayre <<a
moz-do-not-send="true" href="mailto:steveayre@gmail.com">steveayre@gmail.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">Sorry I meant to say with the daemon.
(uuidd). That would be unique between <span></span>multiple
instances too. If the time one is used its already unique
to the server. But as I said, I'm not sure if that's the one
FS uses.<br>
<br>
On Monday, May 20, 2013, Yossi Neiman wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">If
you're running multiple FS instances, you could also use
both the FS<br>
server UUID in addition to the session UUID together.
That'd mean<br>
storing more data but it would probably be on the order of
winning a<br>
$500 million USD Powerball game twice within the same
month...<br>
<br>
-Yossi<br>
<br>
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