title: Release 2.4.0 available date: 2014-04-07
Apache Hadoop 2.4.0 contains a number of significant enhancements such as:
- Support for Access Control Lists in HDFS
- Native support for Rolling Upgrades in HDFS
- Usage of protocol-buffers for HDFS FSImage for smooth operational upgrades
- Complete HTTPS support in HDFS
- Support for Automatic Failover of the YARN ResourceManager
- Enhanced support for new applications on YARN with Application History Server and Application Timeline Server
- Support for strong SLAs in YARN CapacityScheduler via Preemption
Please see the Hadoop 2.4.0 Release Notes for details.