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<div class="moz-cite-prefix">You might want to look at the v1 UUID
as created by <a class="moz-txt-link-freetext" href="https://github.com/okeuday/uuid">https://github.com/okeuday/uuid</a> since the node id
part of the v1 UUID is specific to both the Erlang node (including
the MAC address) and the Erlang pid that created the UUID state.
For time synchronization among nodes ntpd is normally used to
minimize time differences, which then influences the time reported
by erlang:now/0 and erlang:system_time/1.<br>
<br>
On 04/19/2015 11:44 PM, Sergej Jurečko wrote:<br>
</div>
<blockquote
cite="mid:CAAbM2=Zw7fUOM9HfujxNejpKAaAUCC5WK7VOEZx3V72H2_bUNw@mail.gmail.com"
type="cite">
<p dir="ltr">It does not guarantee unique values in cluster.<br>
</p>
<p dir="ltr">Sergej</p>
<div class="gmail_quote">On Apr 20, 2015 8:42 AM, "Daniel" <<a
moz-do-not-send="true" href="mailto:liudanking@gmail.com">liudanking@gmail.com</a>>
wrote:<br type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, dear
list,<br>
<br>
I am looking for a global sequence generator in erlang
cluster.<br>
<br>
I think erlang:now() is promising, because it is fast enough
and “also guarantees that subsequent calls to this BIF returns
continuously increasing values”. But I am not quite sure
whether this guarantee also works for erlang cluster which
have several nodes running on different servers?<br>
<br>
I have read Time and time correction in Erlang (<a
moz-do-not-send="true"
href="http://www.erlang.org/doc/apps/erts/time_correction.html"
target="_blank">http://www.erlang.org/doc/apps/erts/time_correction.html</a>),
but still have no conclusion.<br>
<br>
Daniel Liu<br>
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