Relationship Between Hue and Other Components

Relationship Between Hue and Hadoop Clusters

Figure 1 shows how Hue interacts with Hadoop clusters.

Figure 1 Hue and Hadoop clusters
Click to enlarge

**Table 1** Relationship Between Hue and Other Components
Connection Name	Description
HDFS	HDFS provides REST APIs to interact with Hue to query and operate HDFS files. Hue packages a user request into interface data, sends the request to HDFS through REST APIs, and displays execution results on the web UI.
Hive	Hive provides Thrift interfaces to interact with Hue, execute Hive SQL statements, and query table metadata. If you edit HQL statements on the Hue web UI, then, Hue submits the HQL statements to the Hive server through the Thrift APIs and displays execution results on the web UI.
YARN/MapReduce	MapReduce provides REST APIs to interact with Hue and query YARN job information. If you go to the Hue web UI, enter the filter parameters, the UI sends the parameters to the background, and Hue invokes the REST APIs provided by MapReduce (MR1/MR2-YARN) to obtain information such as the status of the task running, the start/end time, the run log, and more.
Oozie	Oozie provides REST APIs to interact with Hue, create workflows, coordinators, and bundles, and manage and monitor tasks. A graphical workflow, coordinator, and bundle editor are provided on the Hue web UI. Hue invokes the REST APIs of Oozie to create, modify, delete, submit, and monitor workflows, coordinators, and bundles.
ZooKeeper	ZooKeeper provides REST APIs to interact with Hue and query ZooKeeper node information. ZooKeeper node information is displayed in the Hue web UI. Hue invokes the REST APIs of ZooKeeper to obtain the node information.
Impala	Impala provides Hue Beeswax APIs to interact with Hue, execute Hive SQL statements, and query table metadata. If you edit HQL statements on the Hue web UI, then, Hue submits the HQL statements to the Hive server through the Hue Beeswax APIs and displays execution results on the web UI.