HDP-2.3.4 Release Notes
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Hortonworks strongly recommends that all users running HDP 2.3.4 upgrade to HDP

In HDP-2.3.0, instead of shipping a specific Apache release of Mahout, we synchronized to a particular revision point on Apache Mahout trunk. This revision point is after the 0.9.0 release, but before the 0.10.0 release. This provides a large number of bug fixes and functional enhancements over the 0.9.0 release, but provides a stable release of the Mahout functionality before the complete conversion to new Spark-based Mahout in 0.10.0. In the future, after the Spark-based Mahout functionality has stabilized, HDP plans to ship with it.

The revision point chosen for Mahout in HDP 2.3.x is from the "mahout-0.10.x" branch of Apache Mahout, as of 19 December 2014, revision 0f037cb03e77c096 in GitHub.

In addition, we have provided the following patches: