Schema Replication - Red Hat DIRECTORY SERVER 7.1 - DEPLOYMENT Deployment Manual

Schema Replication

In all replication scenarios, before pushing data to consumer servers, the supplier
server checks whether its own version of the schema is in sync with the version of
the schema held on consumer servers.
If the schema entries on both supplier and consumers are the same, the replication
operation proceeds.
If the version of the schema on the supplier server is more recent than the version
stored on the consumer, the supplier server replicates its schema to the consumer
before proceeding with the data replication.
If the version of the schema on the supplier server is older than the version stored
on the consumer, you will probably witness a lot of errors during replication
because the schema on the consumer cannot support the new data.
A consumer might contain replicated data from two suppliers, each with different
schema. Whichever supplier was updated last will "win," and its schema will be
propagated to the consumer.
NOTE You must never update the schema on a consumer server because
the supplier server is unable to resolve the conflicts that will occur,
and replication will fail.
Schema should be maintained on a supplier server in a replicated
topology. If using the standard
will be replicated to all consumers. When using custom schema
files, ensure that these files are copied to all servers after making
changes on the supplier. After copying files, the server must be
restarted. Refer to "Creating Custom Schema Files," on page 55, for
more information.
The same Directory Server can hold read-write replicas for which it acts as a
supplier and read-only replicas for which it acts as a consumer. Therefore, you
should always identify the server that will act as a supplier for the schema and set
up replication agreements between this supplier and all other servers in your
replication environment which should act as consumers for the schema
information..
NOTE Special replication agreements are not required to replicate the
schema. If replication has been configured between a supplier and a
consumer, schema replication will happen by default.
Using Replication with Other Directory Features
file, these changes
99user.ldif
Chapter 6 Designing the Replication Process 137