Oracle Big Data Cloud Service - Compute Edition (BDCS-CE) has been released and is generally available in 4 different Oracle Cloud Data-centers (Chicago, Ashburn, Slough and Amsterdam).
BDCS-CE is fully elastic Big Data Cloud Service build on Oracle's Hadoop Distribution.
Elasticiy means you can start small, as the minimum configuration for the metered service is just 2 OCPUs at $0.3226 per OCPU hour, but of course you can scale up to meet your needs.
Key features of BDCS-CE
Getting started with BDCS-CE
Free trials will be available shortly at cloud.oracle.com/tryit