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In the case of cascading replication, the hub supplier holds a read-only replica
that it supplies to consumers. For more information, refer to "Cascading
Replication," on page 283.
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In the case of multi-master replication, both masters are suppliers and
consumers for the same read-write replica. For more information, refer to
"Multi-Master Replication," on page 281.
In Directory Server, replication is always initiated by the supplier server, never by
the consumer. This operation is called supplier-initiated replication. It allows you
to configure a supplier server to push data to one or more consumer servers.
Earlier versions of the Directory Server allowed consumer-initiated replication
where you could configure consumer servers to pull data from a supplier server.
Change Log
Every supplier server maintains a change log. A change log is a record that
describes the modifications that have occurred on a replica. The supplier server
then replays these modifications to the replicas stored on consumer servers, or to
other suppliers in the case of multi-master replication.
When an entry is modified, a change record describing the LDAP operation that
was performed is recorded in the change log.
In Directory Server, the format of the change log has changed. It is now only
intended for internal use by the server. If you have applications that need to read
the change log, you need to use the Retro Change Log Plug-in for backward
compatibility. For more information, refer to "Using the Retro Change Log
Plug-In," on page 320.
Unit of Replication
In Directory Server, the smallest unit of replication is a database. This means that
you can replicate an entire database, but not a subtree within a database. Therefore,
when you create your directory tree, you must take your replication plans into
consideration. For more information on how to set up your directory tree, refer to
Netscape Directory Server Deployment Guide.
Replication Overview
Chapter 8
Managing Replication
277
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