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This document describes the HCatalog REST API, WebHCat, which was previously called Templeton. If you are looking for a Hive GUI instead of an API, see Hive Web Interface (removed in release 2.2.0).

As shown in the figure below, developers make HTTP requests to access Hadoop MapReduce (or YARN), Pig, Hive, and HCatalog DDL from within applications. Data and code used by this API are maintained in HDFS. HCatalog DDL commands are executed directly when requested. MapReduce, Pig, and Hive jobs are placed in queue by WebHCat (Templeton) servers and can be monitored for progress or stopped as required. Developers specify a location in HDFS into which Pig, Hive, and MapReduce results should be placed.

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