This is the next release of Apache Hadoop 3.0 line. It contains 249 bug fixes, improvments and other enhancements since 3.0.2.
Users are encouraged to read the overview of major changes since 3.0.2. For details of 249 bug fixes, improvements, and other enhancements since the previous 3.0.2 release, please check release notes andi changelog detail the changes since 3.0.2.