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Sun OpenDS Standard Edition 2.2 Architectural Reference |
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6. Directory Server Replication > External Change Log > Porting Applications that Rely on Other Change Logs |
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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
Directory Server Change Processing
Historical Information and Conflict Resolution
What is a Replication Conflict?
Purging Historical Information
Schema Replication Architecture
Replication Status Definitions
Full Update Status and Bad Generation ID Status
Safe Read Mode and Replication Groups
Assured Replication Connection Algorithm
Assured Replication and Replication Status
Assured Replication Monitoring
Fractional Data Set Identification
Fractional Replication Filtering
Fractional Replication and Local Operations
How the External Change Log Works
Porting Applications that Rely on Other Change Logs
Differences Between the ECL and the LDAP Change Log Draft
Additional Differences Between the ECL and the Sun DSEE Retro Change Log
Limitations of the Compability API
Sun OpenDS Standard Edition provides an additional API that is compatible with the LDAP draft change log and supports most of the additional features of the Sun DSEE Retro Change Log. The use of this API has a performance impact in terms of CPU and database (disk) space on the server side, and some computation for the application that fails over from one ECL server to another one.
The use of this compatible API (compatible mode) is configured when the server receives a request on the ECL with no change log cookie. The server returns entries with a changenumber attribute, the value of which is an incremental integer.
The client can search the ECL by providing a filter on the changenumber. The target entry unique ID is stored in an attribute called targetuniqueid with a format compatible with the Sun DSEE Retro Change Log. The first and last changenumber are present as attributes of the root DSE entry.
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