It gives me great pleasure to announce that the Apache Hadoop community has voted to release Apache Hadoop 2.4.0.

hadoop-2.4.0 is the second release for the year 2014, and brings a number of enhancements to the core platform, both HDFS & YARN:
• Support for Access Control Lists in HDFS
• Support for Rolling Upgrades of HDFS
• Switch to 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

Of course, a number of bug-fixes, enhancements etc. have also made it into hadoop-2.4.0; there-by continuing to improve Apache Hadoop. Please see the release notes for more details.

Thanks to all those who contributed to the release!


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