Re: back-meta hangs (ITS#3058)

[aleksander.adamowski@altkom.pl]

>I remember that sentence (I might have written it myself); the point is
>that the  mechanism, AFAIR, is quite gross, in that the failover occurs
>when the connection is first initialized; since back-ldap (I don't recall
>back-meta) pools connections, if the failure occurs and there's no
>connection re-init, you're stuck.
>
I've tested back-ldap, it does failover very well (at least as well as 
back-meta). When I have multiple target servers in the uri, separated by 
spaces, back-ldap always tries to contact the first one. If it doesn't 
respond, back-ldap retries with the next target. If it finds a working 
target server, it returns the results to the client.
All this is completely transparent to the client.

However, since the list of targets for back-ldap is space or 
comma-separated, I have to drop the base DN from uri specification (as 
it contains a comma - it's a DN after all...).

My setup looks approximately like this (back-ldap is a separate slapd 
instance that listens on port 391):

-------BEGIN-------
database        ldap
suffix          "dc=example,dc=com,o=Organization"
rootdn    "cn=Manager,dc=example,dc=com,o=Organization"
rootpw    secret
uri           "ldap://localhost:389/ ldaps://ldapreplica.example.com"

# dla starego base DN "o=altkom.com.pl":
database        ldap
suffix          "o=altkom.com.pl"

uri           "ldap://localhost:389/ ldaps://ldapreplica.example.com"
suffixmassage  "o=example.com" "dc=example,dc=com,o=Organization"

# for empty base DN:
database        ldap
suffix          ""

uri           "ldap://localhost:389/ ldaps://ldapreplica.example.com"

rewriteEngine on
rewriteContext searchBase
rewriteRule   "$" "dc=example,dc=com,o=Organization" ":"
-------END-------

Now I have to see whether back-ldap won't exhibit the deadlock problem 
back-meta did... This will require some weeks of stable operation.

-- 
Best Regards,
    Aleksander Adamowski
        GG#: 274614
        ICQ UIN: 19780575 
	http://olo.ab.altkom.pl