Mailing-List: contact commits-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@cassandra.apache.org
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: quoted-printable
From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Sun, 30 Oct 2011 16:13:41 -0000
Message-ID: <20111030161341.44872.14419@eos.apache.org>
Subject: =?utf-8?q?=5BCassandra_Wiki=5D_Update_of_=22FAQ=22_by_RalphGoers?=
Auto-Submitted: auto-generated

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=3D138&rev2=3D139

  =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/. 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).
+ Use the UUID generator from: http://johannburkard.de/software/uuid/. See =
[[TimeBaseUUIDNotes | Time based UUID Notes]]
  =

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