Which three Hadoop distributions are supported on Oracle Cloud Infrastructure (OCI)?

You are building a file system that needs to handle large files with a lot of nodes reading at the same time.
What minimum size of block volume maximizes throughput for large files?

When an instance pool scales in, what is the correct order that the instances are terminated?

What minimum size of block volume with Balanced performance tier maximizes throughput for large files?

On Oracle Cloud Infrastructure (OCI), a customer wants to build a 3TB filesystem for high IOPS workloads (like relational databases, small files, etc).
Which action provides the highest IOPS using OCI block volumes for storage?