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HDP 2.3 eliminates much of the complexity administering Hadoop and improves developer productivity. Hide
For the Hadoop Administrator

Ambari’s new guided configurations makes installation and configuration of HDFS, YARN, Hive and HBase easier and more predictable.
Ambari now supports customizable operations dashboard which allow administrators to focus on the cluster’s key performance indicators.
Automated Host Discovery for fast and predictable cluster formation.
Introduction of Cloudbreak from the recent SequenceIQ acquisition, automating provisioning of HDP clusters in wide choice of cloud environments.
For the Hadoop Developer

Enriched SQL semantics and new Hive User View in Ambari to write, run and debug queries.
Web interface for forms-based creation of Apache Falcon data feeds and pipeline processing.
Enhanced Apache Spark on YARN with the new Data Frame API and machine learning algorithms for feature-rich Spark applications, as well as a technology preview of Spark SQL.
Try the updated HDP Overview Tutorial to get started with this new experience.
Extensive Security and Data Governance Enhancements
HDP 2.3 delivers innovations in core Hadoop to deliver Enterprise security and governance. Hide
Security Administration, Authorization, and Audit:

Apache Ranger now manages authorization and audit policies for Apache Kafka, Apache Solr, and multi-tenant YARN queues..
Authentication:

Apache Knox now has bi-directional SSL support and LDAP data caching for improved performance and enables custom 3rd-party components to protect their APIs through this gateway.
Data Protection:

Now supports data at rest encryption with HDFS TDE and Ranger KMS.
Data Governance:

Now shipping Apache Atlas, a new Apache incubator project providing metadata based HDP governance and compliance.