Documentation Database Servers Beat
Apache HBase is Bigtable like data store, built on top of Hadoop.
Apache Hive is a Hadoop based NoSQL data warehouse.
In Fedora 21, the mariadb packages have been updated to the upstream version 10.0, which provides various bug fixes and enhancements. Among others, the support for parallel and multi-source replication has been added as well as the support for global transaction IDs. In addition, several new storage engines have been implemented.
For the list of all changes, see the MariaDB Knowledge Base.