DS 7.4.1

Fractional replication (advanced)

This information applies to advanced deployments.

With fractional replication, you specify the attributes to include and to exclude using fractional-include and fractional-exclude configuration properties. Fractional replicas must respect LDAP schemas. Attributes that are required by the relevant object classes are included whether you specify them or not. Excluded attributes must be optional attributes of the relevant object classes.

Each attribute must remain on at least one replica. When you configure a replica to exclude an attribute, the replica checks that the attribute is never added to the replica as part of any LDAP operation. If you exclude the attribute everywhere, it can never be added anywhere.

When using fractional replication, initialize replication from LDIF. The import process imports only the data allowed by fractional replication. Be aware that you cannot create a replica with a full data set from a replica with only a subset of the data.

Replication servers filter objects for fractional replication. If you must prevent data from being replicated across a national boundary, for example, keep standalone replication servers in locations where you can store full entries and their changes. Outside that location, set up standalone replicas that receive the fractional entries.

The following example configures a fractional replica with a subset of inetOrgPerson attributes:

$ dsconfig \
 set-replication-domain-prop \
 --provider-name "Multimaster Synchronization" \
 --domain-name "dc=example,dc=com" \
 --set fractional-include:inetorgperson:cn,givenname,mail,mobile,sn,telephonenumber \
 --hostname replica.example.com \
 --port 4444 \
 --bindDN uid=admin \
 --bindPassword password \
 --usePkcs12TrustStore /path/to/opendj/config/keystore \
 --trustStorePassword:file /path/to/opendj/config/keystore.pin \
 --no-prompt

The following example excludes a custom attribute, sessionToken, on the replica:

$ dsconfig \
 set-replication-domain-prop \
 --provider-name "Multimaster Synchronization" \
 --domain-name "dc=example,dc=com" \
 --set fractional-exclude:*:sessionToken \
 --hostname replica.example.com \
 --port 4444 \
 --bindDN uid=admin \
 --bindPassword password \
 --usePkcs12TrustStore /path/to/opendj/config/keystore \
 --trustStorePassword:file /path/to/opendj/config/keystore.pin \
 --no-prompt

This example only applies if you have defined a sessionToken attribute in the LDAP schema.

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