Question 7
Domain 1: Design and prepare a machine learning solutionYou have been contracted by Wayne Enterprises to help their IT team set up a new cluster in Azure Databricks. They want to understand what happens behind the scenes when a new cluster is created in the Azure Databricks workspace. What is an accurate description of these behind-the-scenes actions?
Correct answer: B
Explanation
Azure Databricks provisions compute as a cluster made up of a driver and worker nodes, matching the selected VM type and size. This follows the definition of a cluster as the set of machines that run the workload, with the driver coordinating tasks and workers executing them.
Why each option is right or wrong
A. Azure Databricks workspace is deployed on dedicated VMs where any given cluster nodes are symbionts of the VM hosts.
B. Azure Databricks creates a cluster of driver and worker nodes, based on your VM type and size selections.
Azure Databricks provisions the compute for a cluster as a set of virtual machines in the selected Azure region, with one driver node coordinating the job and one or more worker nodes executing tasks; the node count and VM SKU are determined by the cluster configuration you choose. In Databricks terminology, a cluster is the collection of these machines, and the workspace creates them automatically when you start the cluster rather than exposing a single standalone VM.
C. Azure Databricks provisions a dedicated VM that processes all jobs, based on your VM type and size selection.
D. When an Azure Databricks workspace is deployed, you are allocated a pool of VMs. Creating a cluster draws from this pool.