Apache Hadoop 2.5.0 - New Release

Apache Hadoop 2.5.0 is a minor release in the 2.x release line and includes some major features and improvements, including: Extended file attributes and improved Web UIs in HDFS, Security for ATS, Richer YARN REST APIs and Several bug fixes.

Overview of key features and improvements:


  • Authentication improvements when using an HTTP proxy server. This is useful when accessing WebHDFS via a proxy server.
  • A new Hadoop metrics sink that allows writing directly to Graphite.
  • Specification work related to the Hadoop Compatible Filesystem (HCFS) effort.


  • Support for POSIX-style filesystem extended attributes. 
  • Using the OfflineImageViewer, clients can now browse an fsimage via the WebHDFS API.
  • The NFS gateway received a number of supportability improvements and bug fixes. The Hadoop portmapper is no longer required to run the gateway, and the gateway is now able to reject connections from unprivileged ports.
  • The SecondaryNameNode, JournalNode, and DataNode web UIs have been modernized with HTML5 and Javascript.


  • YARN's REST APIs now support write/modify operations. Users can submit and kill applications through REST APIs.
  • The timeline store in YARN, used for storing generic and application-specific information for applications, supports authentication through Kerberos.
  • The Fair Scheduler supports dynamic hierarchical user queues, user queues are created dynamically at runtime under any specified parent-queue.

See: http://bit.ly/VPAOhf