Trafodion is an open-source webscale SQL-on-Hadoop DBMS solution that extends and builds on Apache Hadoop. Its name is the Welsh word for "transactions" (pronounced "Tra-vod-eee-on") because the developers wanted to emphasize the fact that one specific way it extended Hadoop was through guaranteed transactional integrity. By doing so, it targets big data transactional and operational workloads rather than analytic workloads. It is ACID-compliant and has fully-functional ANSI SQL support
Multi-version Concurrency Control (MVCC)
Apache Trafodion utilizes the HBase-Trx implementation of Multi-version Concurrency Control (MVCC). This implementation guarantees row-level ACID semantics and only requires row locks for write operations, not read operations.
Decomposition Storage Model (Columnar)
Trafodion uses a single column family to store all columns.
https://github.com/apache/trafodion
https://trafodion.apache.org/documentation.html
Hewlett-Packard Company
2014