A new execution engine for Hadoop
Hive running on top of MR3
MR3 is a new execution engine for Hadoop. Similar in spirit to Tez, it can be thought of as an enhancement of Tez with simpler design, better performance, and more features. MR3 is ready for production use as it supports all major features from Tez such as Kerberos-based security, authentication and authorization, fault-tolerance, and recovery. MR3 is implemented in Scala.
Hive-MR3 is an extension of Hive that runs on top of MR3. In order to exploit new features in MR3, Hive-MR3 is built on a modified backend of Hive. In comparison with Hive-on-Tez, Hive-MR3 generally runs faster for sequential queries by virtue of the simple architectual design of ApplicationMaster in MR3. In particular, it makes a better utilization of computing resources and thus yields a higher throughput for concurrent queries.