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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Sun, 30 Oct 2011 08:00:31 -0000
Message-ID: <20111030080031.89689.4880@eos.apache.org>
Subject: =?utf-8?q?=5BCassandra_Wiki=5D_Update_of_=22FAQ=22_by_RalphGoers?=
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Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Cassandra Wiki" for=
 change notification.

The "FAQ" page has been changed by RalphGoers:
http://wiki.apache.org/cassandra/FAQ?action=3Ddiff&rev1=3D137&rev2=3D138

  =3D=3D Why is it so hard to work with TimeUUIDType in Java? =3D=3D
  TimeUUID's are difficult to use from java clients because java.util.UUID =
does not support generating version 1 (time-based) UUIDs.  Here is one way =
to work with them and Cassandra:
  =

- Use the UUID generator from: http://johannburkard.de/software/uuid/
+ Use the UUID generator from: http://johannburkard.de/software/uuid/. Note=
 that while a Type 1 UUID uses a granularity of 100 ns this UUID generator =
only uses milliseconds. Even with 100 ns granularity, with a Type 1 UUID it=
 is still possible to get a duplicate UUID in a multi-threaded application =
running on a processor with muliple CPUs unless the clock sequence is prope=
rly incremented, which this UUID does not do (in this implementation the cl=
ock sequence is a random number generated when the class is loaded).
  =

  Below are three methods that are quite useful in working with the uuids a=
s they come in and out of Cassandra.
 =20