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| Hue is a set of web applications that enable you to interact with a CDH cluster. Hue applications let you browse HDFS and work with Hive and Cloudera Impala queries, MapReduce jobs, and Oozie workflows.
The Hue server part is written in python Django framework and different systems, say Hbase or Impala, are configured as separate apps in Django. The users are able to control these components on the cluster through the web interface. And it is also possible to add customized apps to Hue server to provide support for additional system.
Logic view of the system
As shown in the above diagram, the CDAP and SENTRY support are configured as a plugin app installed in the Hue system. Hue's front system is implemented in Django, which provides good isolation and extension for multiple apps running together in a web service. A separate panel section will be created in the Hue's default UI for related operations. This app will communicate with the CDAP system through CDAP's restful api service. All the live entities will be displayed in Hue's UI. Communication with Apache SENTRY is enabled by SENTRY's thrift service. When admin grants/ evokes certain privileges through the Hue UI, it will be propagated to the SENTRY system and take effects on the further request coming from CDAP.
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