Glossaries: H

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HaaS

Hadoop as a Service.


Hadoop

A Java-based, distributed programming framework for processing large data sets. An application can be broken down into numerous small parts, called fragments or blocks, that can be run on any node in the cluster. Hadoop is free and part of the Apache project, sponsored by the Apache Software Foundation.


Hadoop as a Service (Haas)

The running of Hadoop in the Cloud, requiring no local hardware or IT infrastructure. The service is typically elastic, allowing the adding or removal of nodes depending on user needs.


Hadoop Distributed File System (HDFS)

The primary distributed storage used by Hadoop applications. A HDFS cluster has a NameNode that manages the file system metadata and DataNodes to store the actual data.


Haptic Technology or Haptics

Also referred to as Haptics or “touch feedback,” haptic technology applies tactile sensations to human interactions with machines. The simplest example is the actuator that vibrates a cell phone, but more advanced haptics can detect the pressure applied to a sensor, affecting the response.


HDFS

Hadoop Distributed File System.


Heating, Ventilation, and Air Conditioning (HVAC)

Sometimes grouped with refrigeration as HVACR, these systems cover both vehicular and indoor building comfort control.


HEM

Home Energy Management.


HEMS

Home Energy Management System.


Heterogeneous Network (HetNet)

Small cell networks using both macro and small cells. HetNets allow mobile operators to better utilize their data networks’ capacity.