When you create a mass ingestion specification, the Mass Ingestion Service validates and stores and specification in a Model repository. When you deploy the specification, the Mass Ingestion Service deploys the specification to a Data Integration Service. The Data Integration Service connects to the Hadoop environment. In the Hadoop environment, the Spark engine runs the ingestion jobs configured in the mass ingestion specification and ingests the data to the target. While the specification runs, the Mass Ingestion Service generates ingestion statistics. After the specification run is complete, the Mass Ingestion Service can restart the ingestion jobs.