Re: syncrepl with hardware content switch

[Pierangelo Masarati <ando@sys-net.it>]

Aaron Richton wrote:

> availability -- taking down a slave and having everything else converge 
> onto the remaining slaves in well under a second. A load balancer 
> handles this much faster than the vast majority of clients configured 
> with multiple servers, and there's no client delays as they vainly 
> attempt down servers.

In OpenLDAP 2.4, the client library allows clients to register a call 
that "shuffles" URIs configured via ldap_initialize().  This is used in 
the proxy backends to take note of a failing server, moving it to the 
end of the URI list.  A "smart" client that repeatedly needs to 
establish connections to a list of URIs could do the same in order to 
avoid having to run thru the URI list until one responds.  Dumb clients 
could exploit this by actually contacting a back-ldap/meta configured 
this way.  Of course, this would move the single point of failure to the 
proxy...

p.


Ing. Pierangelo Masarati
OpenLDAP Core Team

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