In the Vertica data migration workflow, Apache Kafka is required to sync data with Vertica, after the bulk data migration process. When Vertica is enabled, the ZENworks server will continue to send data to the existing RDBMS. After bulk data migration, if any data is added or modified in the RDBMS, Kafka syncs these changes with Vertica at an interval of every 10 to 15 minutes.
For more information on Kafka, see Kafka Reference Guide.