machineType property

The Compute Engine [machine type](/compute/docs/machine-types) used for cluster instances, specified as a [relative resource name](/apis/design/resource_names#relative_resource_name).

For example: "projects/{projectId}/zones/{zoneId}/machineTypes/{machineTypeId}". The machineType must belong to the enclosing environment's project and location. If both this field and nodeConfig.location are specified, this machineType must belong to the nodeConfig.location; if both are unspecified, the service will pick a zone in the Compute Engine region corresponding to the Cloud Composer location, and propagate that choice to both fields. If exactly one of this field and nodeConfig.location is specified, the location information from the specified field will be propagated to the unspecified field. The machineTypeId must not be a [shared-core machine type](/compute/docs/machine-types#sharedcore). If this field is unspecified, the machineTypeId defaults to "n1-standard-1". This field is supported for Cloud Composer environments in versions composer-1..-airflow-..*.

Optional.