You can now deploy original applications on your Amazon EMR cluster. Amazon EMR release 4.2.0 now offers Ganglia 3.6,an upgraded version of Apache Spark (1.5.2), and upgraded sandbox releases of Apache Oozie (4.2.0), or Presto (0.125),and Apache Zeppelin (0.5.5). Ganglia provides resource utilization monitoring for Hadoop and Spark. Oozie 4.2.0 includes several original features, such as adding Spark actions and HiveServer2 actions in your Oozie workflows. Spark 1.5.2, and Presto 0.125,and Zeppelin 0.5.5 are maintenance releases, and contain bug fixes and other optimizations.
Source: amazon.com