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Re: [grouper-dev] changelog implementation sketch

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  • From: Tom Barton <>
  • To: Tom Zeller <>
  • Cc: "GW Brown, Information Systems and Computing" <>, Grouper Dev <>
  • Subject: Re: [grouper-dev] changelog implementation sketch
  • Date: Tue, 10 Jun 2008 21:50:18 -0500

For audit, the first order of business is to preserve the information, and for that purpose (alone) we don't need to store the info in both a group-centric and a member-centric way.

Actually answering point-in-time questions should be of rather low frequency compared to using the info for incremental change notification, and it's only the latter that has a need for low latency.

So I think we can pick the single representation (group-centric or member-centric) best suited to sensibly representing changes. And since not all changes to group info are membership related, it looks like group-centric is the only single one that meets the need.


Tom Zeller wrote:
On Tue, Jun 10, 2008 at 10:12 AM, GW Brown, wrote:

--On 10 June 2008 09:17 -0500 Tom Zeller


Representing changes from a group-centric point of view via LDIF
straightforward, but what about member-centrically ? e.g. how
group memberships have changed.

What is the context here? Are we back to the subject id changing or
is this to make it easier to query from a member point of view i.e.
show me all the memberships for 'x' on a given date?

The latter, make it easier/possible to query changes from a member point of view.

If the actual change definitions - the LDIF or whatever format
we use - for a group can be queried using 'like' we could have
an inefficient means of finding relevant changes which would
allow us to compute a subject's memberships at a given point in

I agree: querying LDIF via SQL seems inefficient, perhaps even improper.

fn:Tom Barton
org:University of Chicago;Networking Services & Information Technology
adr;dom:1155 E. 60th St.;;Rm 309, 1155 Bldg;Chicago;IL;60637
title:Sr. Director - Integration
tel;work:+1 773 834 1700

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