On 06/16/2015 12:44 PM, Alexander Frolushkin wrote:

It looks like our duplicates have some "internal" source, it source is not a client system, but one of our IPA servers.

to get these kind of conflict two servers have to be involved
if you say internal source, what kind of entries are affected ? do you mean these entries are created internally on server by a plugin ?

Is it possible to get such duplicate records in combination of replication "multipath" and some clock skew (it is not ideally synchronized because of very big distances between sites)?

the clock skew should have no effect, the replication protocol additinally manages it own time used in genratio of CSNs and tries to synchronize time, it could affect the oreder changes are applied during replication, but for these conflicts there have to be two independent ADDs

WBR,

Alexander Frolushkin

Cell +79232508764

Work +79232507764

*From:*freeipa-users-boun...@redhat.com [mailto:freeipa-users-boun...@redhat.com] *On Behalf Of *Ludwig Krispenz
*Sent:* Tuesday, June 16, 2015 3:52 PM
*To:* freeipa-users@redhat.com
*Subject:* Re: [Freeipa-users] replication conflicts

On 06/16/2015 11:42 AM, Alexander Frolushkin wrote:

    Hello.

    Just to remind if somebody still not familiar with our IPA
    installation J

    We currently have 18 IPA servers in domain, on 8 sites in
    different regions across the Russia.

    And now, our new problem.

    Regularly we getting a nsds5ReplConflict records on some of our
    servers, very often on servers from specific site. Usually it is
    simply a doubles and we can remove the renamed change to get
    everything back. But why do we have them at all?

    May be someone could explain, how we can detect the cause of this
    replication conflicts?

if you are talking about having two "duplicate" entries,
one: uid=xxxxx,<suffix>
one: nsuniqueid=nnnnnnnn+uid=xxxxx,<suffix>

these entries appear if the entry uid=xxxxx was added, simultaneously, on two servers. I think this can happen if a client tries to add an entry and if it doesn't get a response in some time retries on another server. to find out which client this is you need to check on which servers the entries were originally added and then see which client was doing it

Sometime it is moderately harmful, because, for example HBAC stops working on specific server while doubles still present.

Thanks in forward...

WBR,

Alexander Frolushkin

Cell +79232508764

Work +79232507764

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