The config settings for Compute Engine resources in an instance group, such as a master or worker group.
Output only. The list of instance names. Dataproc derives the
names from cluster_name, num_instances, and the
instance group.
Optional. The Compute Engine machine type used for cluster
instances. A full URL, partial URI, or short name are valid.
Examples: - https://www.googleapis.com/compute/v1/projects
/[project_id]/zones/us-east1-a/machineTypes/n1-standard-2 -
projects/[project_id]/zones/us-
east1-a/machineTypes/n1-standard-2 - n1-standard-2
Auto Zone Exception: If you are using the Dataproc Auto
Zone Placement
<https://cloud.google.com/dataproc/docs/concepts/configuring-
clusters/auto-zone#using_auto_zone_placement>__ feature, you
must use the short name of the machine type resource, for
example, n1-standard-2.
Output only. Specifies that this instance group contains preemptible instances.
Optional. The Compute Engine accelerator configuration for these instances.