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Description of problem:
The IDL scan limit is set to the default value of 4000.
The MemberOf plugin and the Referential Integrity plugin are disabled.
If the substring index is configured for the group membership attribute ( member or uniqueMember ),
the removal of a member from a large static group is pretty slow:
[11/Aug/2020:20:30:13.751180159 +0200] conn=8 op=1 MOD dn="cn=largeGroup,dc=large,dc=group,dc=university,dc=com"
[11/Aug/2020:20:32:45.997562241 +0200] conn=8 op=1 RESULT err=0 tag=103 nentries=0 etime=152.247032023
Version-Release number of selected component (if applicable):
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.8 Beta (Maipo)
#
# rpm -qa | grep 389-ds-base
389-ds-base-debuginfo-1.3.10.1-5.el7.tkt51166.x86_64
389-ds-base-libs-1.3.10.1-5.el7.tkt51166.x86_64
389-ds-base-1.3.10.1-5.el7.tkt51166.x86_64
389-ds-base-snmp-1.3.10.1-5.el7.tkt51166.x86_64
#
How reproducible:
Always.
Steps to Reproduce:
1. Create the substring index for the membership attribute.
2. Add a large static group.
3. Delete a member from the group.
Actual results:
The MOD operation to remove the value is too slow.
Expected results:
Fast MOD operation.
Additional info:
If the substring index is removed, the MOD operation takes less than a second:
[11/Aug/2020:20:19:50.161556531 +0200] conn=2 op=1 MOD dn="cn=largeGroup,dc=large,dc=group,dc=university,dc=com"
[11/Aug/2020:20:19:50.784878515 +0200] conn=2 op=1 RESULT err=0 tag=103 nentries=0 etime=0.623626797
I could reproduce the issue:
I created a group with 150k members, and deleted a member of the group and it took over 8 seconds to complete when a substring index is present for member.
[20/Aug/2020:15:00:38.461356917 -0400] conn=5 op=1 MOD dn="cn=big-1,dc=example,dc=com"
[20/Aug/2020:15:00:47.448968760 -0400] conn=5 op=1 RESULT err=0 tag=103 nentries=0 wtime=0.000302920 optime=8.987646011 etime=8.987945700
Here are the steps to reproduce:
# dsctl slapd-localhost ldifgen groups --number 1 --suffix dc=example,dc=com --num-members 150000 --create-members --member-attr member --ldif-file /var/lib/dirsrv/slapd-localhost/ldif/group.ldif big
# dsconf slapd-localhost backend import userroot group.ldif
# ldapmodify -D "cn=directory manager" -w PASSWORD
dn: cn=big-1,dc=example,dc=com
changetype: modify
delete: member
member: uid=group_entry1-149999,dc=example,dc=com
CPU goes to 100%, and it takes almost 9 seconds to complete.