Which nodes should the Specialist launch on Spot Instances?
Master node
Any of the core nodes
Any of the task nodes
Both core and task nodes
Explanations:
The master node is essential for managing the EMR cluster, and if it fails, the entire cluster would be disrupted. It should not be launched as a Spot Instance.
Core nodes store HDFS data and run essential tasks. Losing core nodes would cause data loss or cluster failure, so they should not be launched as Spot Instances.
Task nodes are transient and can be terminated without affecting the overall operation of the cluster. They are ideal candidates for Spot Instances, which are cheaper but can be interrupted.
Core nodes should not be launched as Spot Instances due to their critical role in the cluster. Task nodes, however, are suitable for Spot Instances. Hence, the answer is incorrect.