MySQL horizontal scaling

ScaleBase is a distributed database built on MySQL and optimized for the cloud. It is a relational database cluster that dynamically optimizes workloads and availability by logically distributing data. ScaleBase automates the data lifecycle, including analysis, data migration and node rebalancing.  ScaleBase provides an easy to manage horizontally scalable database cluster built on MySQL that dynamically optimizes workloads across multiple instances.  is  based in Newton, MA. The AWS Marketplace offering can be found here:  https://aws.amazon.com/marketplace/pp/B00K8B5BOG.  ScaleBase provides the scalability and availability benefits of NoSQL databases while using a relational database.

Mahout and R

Mahout:

•Machine learning library

•Supports recommendation mining, clustering, classification, and frequent itemset mining

R:

•Language and software environment for statistical computing and graphics

•Open source

Mahout is not R and SAS.

SAS article on comparing the three: http://support.sas.com/resources/papers/Benchmark_R_Mahout_SAS.pdf

Horizontal Scaling of Oracle on AWS

Just came across this solution.
Parelastic: http://www.parelastic.com (MySQL only at this time)

I really enjoyed the 'sharding sucks' mantra.  Being an 'old school' Oracle guy, the new world answer to  database scaling is sharding...I think that is very naive.

I know of these two companies in this space as well:

Scalearc (MySQL and SQL Server)

Scalebase : http://www.scalebase.com (MySQL only at this time)

Oracle WebLogic clustering

Active/active high availability with Oracle Weblogic on AWS EC2 can be done with Oracle WebLogic Server clustering.  You must use unicast as multicast is not supported on AWS.