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slurpd and back-config

It doesn't seem worthwhile to pull in all the changes needed to bring slurpd up to date here. I'm more inclined to implement slurpd-like functionality in slapd, and delete slurpd.

First we could move the existing replog functionality into an overlay, as I've suggested before. Next the overlay itself could submit update tasks (using the thread pool or the runqueue, as appropriate) to update remote servers. It could use libldap_r directly, or it could operate through back-ldap/back-meta. I'm somewhat favoring the back-ldap/back-meta approach, as it opens the possibility to use the rewrite overlay in the replication process.

The one thing we'd lack is a standalone/one-shot mode, but we could create a slaptool for that purpose. E.g., define a SLAP_BFLAG for "one-shot" mode; whenever the tool runs it will invoke all the backends/whatever that have this flag defined and skip anything that doesn't have it defined.

 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
 Symas: Premier OpenSource Development and Support