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Sun OpenDS Standard Edition 2.2 Architectural Reference |
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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
API for Compatibility With the LDAP Change Log Draft and the Sun DSEE Retro Change Log
Limitations of the Compability API
If a directory server crashes, its connection to the replication server is lost. Recent changes that the directory server has processed and committed to its database might not yet have been transmitted to any replication server.
When a directory server restarts, therefore, it must compare its state with the server state of the replication servers to which the directory server connects. If the directory server detects that changes are missing and not yet sent to a replication server, the directory server constructs fake operations from historical information. The directory server sends these fake operations to its replication server.
Because the local server state is not saved after each operation, the directory server cannot trust its saved server state after a crash. Instead, it recalculates its server update state, based on historical information.
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