[Samba] Re: samba w/ ldap - groups scalability and performance

Igor Belyi sambauser at katehok.ac93.org
Wed Sep 22 23:56:54 GMT 2004

Igor Belyi wrote:
> Marlys Nelson wrote:
>> The PDC appears to request ALL groups from LDAP, using the search 
>> (objectclass=sambaGroupMapping).  In our case, this is nearly 14,000 
>> entries and it can take almost 10 minutes to retrieve those from LDAP 
>> when there are hundreds trying at once.  Indexing doesn't help in this 
>> case because samba is asking for ALL groups.
>> ...
>> Is there any way to make samba do a more targeted lookup of groups, 
>> perhaps only those groups where the user is a member?
> I'll try to see what I can do.

Ok, here's a patch which changes get_domain_user_groups() to use newly 
introduced pdb interface method: enum_user_groups(). Basically, it's 
just cut&paste from enum_group_mapping() functions.

Login in my home network does not trigger get_domain_user_groups() to be 
called but requests to list user groups does and it returns the correct 
result (so at least this patch does not break anything).

Marlys, according to your post get_domain_user_groups() _is_ triggered 
during login at your site therefore you should see the improvements 
introduced by this patch _if_ listing of all groups during login was the 
reason for your performance degradation. Plus, you probably have better 
setup to test this patch.

Let me know if it helps,

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