On Fri, Dec 08, 2017 at 11:10:49AM +0100, Franky Van Liedekerke wrote:
Before opening a bug report, I wanted to discuss a new issue here.
I have ldap users that are in 1500 groups (yeah, I know ... not my choice either), ldap
is using rfc2307 scheme (openldap, redhat EL7).
Now, when connecting sssd to this ldap server, I've already set enumeration=false,
and also ignore_group_members=true (performance ...).
However, with ignore_group_members=true, I'm getting this in the sssd_nss.log when
doing a 'groups <userid>" command:
[sssd[nss]] [sss_mc_find_record] (0x0010): Corrupted fastcache. name_ptr value is 16
(once when the cache is empty, and after that once or twice per groups-request).
I also see this in /var/log/messages (related of course):
sssd[nss]: Stored copy of corrupted mmap cache in file
'/var/lib/sss/mc/group_corrupted#012'
As a result, this prevents the use of the sssd fast cache, so group requests at best take
5.5 seconds.
Now this problem happens 95% of the cases (which leads me to believe it is a timing bug),
but when I set ignore_group_members=false, this is not happening (and when groups are ok
in the fast cache: 0,03 secs response time).
Ideas? Hints? Or should I just go and open a bug report? Is there a real performance
drawback to setting ignore_group_members=false?
There is already a BZ
https://bugzilla.redhat.com/show_bug.cgi?id=1490120.
I think in your setup (plain LDAP with rfc2307) the performance loss
when using ignore_group_members=false (the default) should be
acceptable.
bye,
Sumit
>
> Thanks,
>
> Franky
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