The Apache Hadoop community is happy to announce the release of Apache Hadoop 2.7.0! We want to express our gratitude to every contributor, reviewer and committer.
The Hadoop community fixed 923 JIRAs in total as part of the 2.7.0 release. Of the 923 fixes:
Hadoop 2.7.0 is the first Hadoop release in 2015, following late last year’s 2.6.0. While Hadoop 2.7.0 is not yet ready for production, it enables the community to execute extensive testing and downstream adoption in order to find and address potential incompatibilities and critical issues. A more stable and production ready release of Hadoop 2.7.x will follow soon.
Starting with Hadoop 2.7.0, Apache Hadoop drops support for the JDK6 runtime and supports only JDK 7+ versions.
The release contains a number of significant enhancements. A few notable ones are:
Additional enhancements include “nntop,” a top-like tool for NameNode (HDFS-6982) and a fast leveldb-based implementation (YARN-2765) for ResourceManager StateStore. Please see the Hadoop 2.7.0 Release Notes for the full list of features, improvements and bug-fixes.
Many thanks to everyone who contributed to the release, and everyone in the Apache Hadoop community!