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Date: Fri, 09 Jan 2009 22:55:22 +0100
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To: Apache Directory Developers List <dev@directory.apache.org>
Subject: CSN, ADS and OpenLDAP
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From: Emmanuel Lecharny <elecharny@gmail.com>

Hi,

currently, for replication, we are using a CSN built from 
http://tools.ietf.org/html/draft-sermersheim-ldap-csn-02 (more or less). 
In fact, our CSN is a composition of a timestamp 
(System.currentMillis()), an operation operationSequence and a 
replicaId. It is constructed this way :

timestamp:replicaId:operationSequence (no padding)


It's not what OpenLDAP is using. OpenLDAP is based on 
http://tools.ietf.org/html/draft-ietf-ldup-model-09, and a CSN is 
constructed this way :

" ...
 * The format of a CSN string is: yyyymmddhhmmssz#s#r#c
 * where s is a counter of operations within a timeslice, r is
 * the replica id (normally zero), and c is a counter of
 * modifications within this operation.  s, r, and c are
 * represented in hex and zero padded to lengths of 6, 3, and
 * 6, respectively. (In previous implementations r was only 2 digits.)
 ...
"

So far, both CSN are incompatible. We could write translators, but I 
also think that it would be great to avoid having a different structure.

Does it makes sense to you ?

-- 
--
cordialement, regards,
Emmanuel L�charny
www.iktek.com
directory.apache.org