Maximum number of uniqueMembers

[Rébeli-Szabó Tamás <tamas.rebeli.szabo@webvalto.hu>]

Hi all,

is there a limit for the number of attributes for entries? Specifically, 
I want to have 500,000 uniqueMembers for a group entry, but I cannot add 
more than 359,000. When I try to add 360,000 or more, I get:

"ldapadd: update failed ... ldap_add: Can't contact LDAP server (-1)"

The group entry look like this:

dn: cn=biggroup,ou=groups,dc=test,dc=com
objectClass:top
objectClass: groupOfUniqueNames
cn: Ah, big group
uniqueMember: uid=user1,ou=users,dc=test,dc=com
uniqueMember: uid=user2,ou=users,dc=test,dc=com
...
uniqueMember: uid=user359000,ou=users,dc=test,dc=com

I have 1 million users in ou=users,dc=test,dc=com (so I haven't run into 
a limit here).

I am on 2.4.41, LMDB with 4G maxsize (RHEL 5.10; 2.6.39). I have no 
limits set in slapd.conf.


Another, related issue:

If I add 359k members to a group, and then I try to modify the group to 
add another member, ldapadd hangs. When I trace it, all I can see is 
continual ldap_result calls, that is, the client is waiting for the 
update operation to end on the server, and slapd is using nearly 100% of 
CPU.

If I restart the server, I can add one member, but I cannot add say a 
hundred thousand more.


Any hint is appreciated.

Regards,

tamas


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