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Date: Sun, 25 Jan 2009 21:54:35 +0100
From: Emmanuel Lecharny <elecharny@gmail.com>
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To: Apache Directory Developers List <dev@directory.apache.org>
Subject: [DRS] Changelog improvements
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Hi guys,

it's essential that we have a decent Changelog system in order to be 
able to build a reliable server, plus use it for replication eventually.

The currengt changelog system has many advantages :
- it basically works
- it's damn fast
- it can be extended easily

But it also has some drawbacks :
- it currently stores changes info in memory
- it stores forward and revert changes (we don't need revert usually)
- it stores changes in LdifEntry which uses Attributes instead of the 
new Entry API

We need to extend the ChangeLog API to get able to handle :
- on disk storage
- Entry instead of Attrinutes
- only forward operations
- fast lookup for an entry by its DN, or entryCSN/UUID attributes.

We may also add a new interceptor for that purpose, namely a 
JournalInterceptor.

Nothing complicated though. My idea is to use a simple file, being 
rotated when we put some tag, plus some JDBM index around to be able to 
lookup for DN, UUID or entryCSN.

wdyt ?

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