If you want to avoid the type 1 opaque type uuid's, PlayOrm also does a simple key generator if you do
@NoSqlId Private String id; It uses the simple hostname(not mac) like a1, a2, a3 which is the names in our cluster plus a unique timestamp within the node. We do not expose the subdomain that is used so in general we though it not to be as much of a security risk. In this fashion, we sometimes have web pages with the hidden id field that has those strings in it. Both of these are guaranteed to be unique. Other types are guaranteed to be unique 9.99999% of the time(some really high threshold) Dean From: Marcelo Elias Del Valle <mvall...@gmail.com<mailto:mvall...@gmail.com>> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> Date: Monday, October 29, 2012 3:31 PM To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org>> Subject: Re: ColumnFamilyInputFormat - error when column name is UUID Dean, Are type 1 UUIDs the best ones to use if I want to avoid conflict? I saw this page: http://en.wikipedia.org/wiki/Universally_unique_identifier The only problem with type 1 UUIDs is they are "not opaque"? I know there is one kind of UUID that can generate two equal values if you generate them at the same milisecond, but I guess I was confusing them... Best regards, Marcelo Valle. 2012/10/29 Hiller, Dean <dean.hil...@nrel.gov<mailto:dean.hil...@nrel.gov>> Hmm, this brings the question of what uuid libraries are others using? I know this one generates type 1 UUIDs with two longs so it is 16 bytes. http://johannburkard.de/software/uuid/ Thanks, Dean From: Marcelo Elias Del Valle <mvall...@gmail.com<mailto:mvall...@gmail.com><mailto:mvall...@gmail.com<mailto:mvall...@gmail.com>>> Reply-To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>> Date: Monday, October 29, 2012 1:17 PM To: "user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>" <user@cassandra.apache.org<mailto:user@cassandra.apache.org><mailto:user@cassandra.apache.org<mailto:user@cassandra.apache.org>>> Subject: Re: ColumnFamilyInputFormat - error when column name is UUID Answering myself: it seems we can't have any non type 1 UUIDs in column names. I used the UTF8 comparator and saved my UUIDs as strings, it worked. -- Marcelo Elias Del Valle http://mvalle.com - @mvallebr
