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The synchronization component will periodically query the IDM system and change the user and group database. There are two synchronization modes: full and differential.

Full synchronization queries all data from the IDM and checks every user, group, and membership to be valid. The resource usage is heavier than the differential synchronization in this type of synchronization and therefore, it is usually only triggered on the very first sync when Alfresco Process Services starts up and is configured to use an external IDM. This is so that all users and groups are available in the database.

To enable full synchronization:

The frequency in which it runs is set using a cron expression:

ldap.synchronization.full.cronExpression=0 0 0 * * ?

Differential synchronization is lighter, in terms of performance, as it only queries the users and groups that have changed since the last synchronization. One downside is that it cannot detect deletions of users and groups. Consequently, a full synchronization needs to run periodically (but less than a differential synchronization typically) to account for these deletions.

ldap.synchronization.differential.cronExpression=0 0 */4 * * ?

Do note that all synchronization results are logged, both in the regular logging and in a database table named IDM_SYNC_LOG

The synchronization logic builds on two elements:

  • Queries that return the correct user/group/membership data

  • A mapping of LDAP attributes to attributes used within the Alfresco Process Services system

There are a lot of properties to configure, so do base your configuration on one of the two files in the META-INF folder, as these contain default values. You only need to add the specific properties to your custom configuration file if the default values are not appropriate.

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