Those aren't really equivalent, are they? Hadoop is for analytics, spanner is transactional. In terms of popular nosql vs google sql products, it's more Hadoop

Those aren't really equivalent, are they? Hadoop is for analytics, spanner is transactional. In terms of popular nosql vs google sql products, it's more Hadoop : BigQuery :: Mongo? : Spanner You're pretty explicitly not supposed to run OLAP queries on spanner.