It gives me great pleasure to announce that the Apache Hadoop community has voted to release Apache Hadoop 2.3.0!

hadoop-2.3.0 is the first release for the year 2014, and brings a number of enhancements to the core platform, in particular to HDFS.

With this release, there are two significant enhancements to HDFS:
• Support for Heterogeneous Storage Hierarchy in HDFS (HDFS-2832)
• In-memory Cache for data resident in HDFS via Datanodes (HDFS-4949)

In YARN, we are very excited to see that ResourceManager Automatic Failover (YARN-149) is nearly complete; even it isn’t ready for primetime yet. We expect it to land by the next release i.e. hadoop-2.4. Furthermore, a number of key operational enhancements have been driven into YARN such as better logging, error-handling, diagnostics etc.

On the MapReduce side of the house, a key enhancement is MAPREDUCE-4421; with this we now no longer need to install MapReduce binaries on every machine and can just use a MapReduce tarball via the YARN DistributedCache by copying it into HDFS.

Of course, a number of bug-fixes, enhancements etc. have also made it into hadoop-2.3; there-by continuing to improve the core platform. Please see the release notes for more details.

PS: Here is a CVE for a security fix along with the release.
CVE-2013-6446: Apache Hadoop job history server vulnerability

Severity: Major

Vendor: The Apache Software Foundation

Versions Affected:
Hadoop 0.23.1 to 0.23.9
Hadoop 2.0.0 to 2.2.0

Users affected: Users who have enabled Hadoop's MapReduce security features

Impact: Vulnerability allows an unauthorized user to retrieve job details from the job history server.

0.23.x users should upgrade to 0.23.10.
2.x users should upgrade to 2.3.0.

This issue was discovered by Koji Noguchi of Yahoo.

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