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Sun OpenDS Standard Edition 2.2 Architectural Reference

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Document Information

1.  Introduction

2.  The Directory Server Access Control Model

3.  Understanding the Directory Server Schema

4.  Directory Server Index Databases

5.  Understanding Directory Server Plug-Ins

6.  Directory Server Replication

Overview of the Directory Server Replication Architecture

Basic Replication Architecture

Replication Servers

Replication Change Numbers

Replication Server State

Operation Dependencies

How Replication Works

Directory Server Change Processing

Change Replay

Auto Repair

Directory Server Crashes

Replication Server Crashes

Historical Information and Conflict Resolution

What is a Replication Conflict?

Resolving Modify Conflicts

Resolving Naming Conflicts

Purging Historical Information

Schema Replication

Schema Replication Architecture

Replication Status

Replication Status Definitions

Degraded Status

Full Update Status and Bad Generation ID Status

Replication Groups

Replication Server Selection

Assured Replication

Assured Replication Modes

Safe Data Mode

Safe Read Mode

Safe Read Mode and Replication Groups

Assured Replication Connection Algorithm

Assured Replication and Replication Status

Assured Replication Monitoring

Fractional Replication

Fractional Data Set Identification

Fractional Replication Filtering

Fractional Replication and Local Operations

External Change Log

How the External Change Log Works

Porting Applications that Rely on Other Change Logs

Differences Between the ECL and the LDAP Change Log Draft

Index Differences

DIT and Schema Differences

Additional Differences Between the ECL and the Sun DSEE Retro Change Log

API for Compatibility With the LDAP Change Log Draft and the Sun DSEE Retro Change Log

Limitations of the Compability API

7.  Directory Server Root Users and the Privilege Subsystem

8.  Supported Controls and Operations

Replication Status Definitions

The following list provides a description of each possible replication status that can be held by a replicated domain.


The local replicated domain is not connected to any replication server. Replication cannot occur until a connection to a replication server is established. This is the only possible status if there is no connection to a replication server.


The local replicated domain is almost in sync with its peers (that is, with the updates received on the replication server). The client LDAP requests have been processed normally.


The local replicated domain is too late regarding updates that have been queued by the replication server. What constitutes too late is defined by the degraded status threshold, that is, the number of changes that the replication server has in its queue for the directory server. With this status, the local directory server might be slow in replaying changes. This can have an impact on assured replication.


An online full update is currently being performed on the local replicated domain (in other words, the domain is receiving entries from a remote directory server). The full update must be completed before the status can be changed and before the replicated domain can participate in replication again.


The local replicated domain does not have the same generation ID as the replication server to which it is connected. Replication cannot run until the local domain is initialized with a data set that has the same generation ID as its replication server. To initialize the local domain, perform an online full update, an LDIF import, or a binary copy of the database, retaining the domain entries.