Full AND fractional replications of the same base DN

This topic has 4 replies, 2 voices, and was last updated 6 years ago by Bruno Masquillier.

  • Author
  • #12492
     Bruno Masquillier


    I want to set up two replications for the same base DN from a given directory server A:
    – one full replication with server B
    – one fractional replication with server C

    As I cannot have the same base DN twice as two domains under the same synchronization provider, I’ve tried setting up a new synchronization provider, containing a new replication server on a new port, and a new domain with the same base DN as the first.

    But then I don’t see how dsreplication enable can allow me to set up the replication for this new fractional domain: it ignores the new port number and adds the new server port as part of the first replication in the original Multimaster Synchronization.

    Should I change the configuration manually? Is there another way?

    Thank you,


    Fractional Replication is a specific configuration of a Replica within a topology.
    So it’s possible to enable replication between server A, B and C, and then set server C as a Fractional replica. In all cases, all Replication services are fully connected, so any change in B or A will be replicated to C (if it matches the fractional part of C).
    I hope this helps.

     Bruno Masquillier

    Thanks Ludo.

    I realise now that my example was incomplete and unclear. May I try to complete it?

    I want a replication of only some attributes between the server A and a server D: for instance they replicate the uids created on each respective server, but nothing else. If I configure a fractional replication on A and D including only the uid, then no client can update these servers with any other attribute but uid.

    So I was thinking a setting a fractional replication on an additional server C between server A and server D, and because A has already a full replication to B on the same base DN, it looks like I need a new synchronization provider containing a new replication domain and server (so that there is no full replication between A and D)

    So my question is: how do I set up a second synchronization provider and replication domain and server? Is it possible? I can create them with the dsconfig create*, but dsreplication enable does not allow me to enable this replication and seems to default to the delivered Multimaster Synchronization provider.


    I think I’m confuse by your example, but regardless, OpenDJ has a single synchronization provider: the MultiMaster Replication one.
    It should be possible to have a server D that only receives uid from server A or B, but it cannot any other common attributes with A and B. This means that A and B should be fractional replicas excluding all attributes from D but the uid.
    Note that I’ve never tried such configuration.
    Now if you want D to have uid synchronized but nothing else, it might be easier with an external synchronization tool such as OpenIDM.

     Bruno Masquillier

    I guess another way to say it was that I was trying to have two topologies (sharing the same schema and DIT) replicating to each other only through a fractional replication, and not connecting otherwise. I was wondering if for this I could add a second synchronization provider: thanks for making clear this is not possible.

    I think the alternative now is between moving each “topology” in its own subtree on separate backends by adding a node to the DIT, or indeed using something like OpenIDM.

    Again, thank you very much for your input.

Viewing 5 posts - 1 through 5 (of 5 total)

You must be logged in to reply to this topic.

©2022 ForgeRock - we provide an identity and access platform to secure every online relationship for the enterprise market, educational sector and even entire countries. Click to view our privacy policy and terms of use.

Log in with your credentials

Forgot your details?