HCatalog is a table management and storage management layer for Apache Hadoop which enables Pig, MapReduce, and Hive users to easily share data on the grid. It also provides a table abstraction for a relational view of data in HDFS.
HCatalog, today, is being utilized for use cases which include the following

• Complex Data processing
• Data Discovery
• Integration

While HCatalog cements its position in the enterprise Hadoop stack, it has also been leveraged by organizations like Teradata in their SQL like offering for Hadoop. At the same time, due to the rapid and consistent progress that the project has made, it is now being voted across to become a sub project for Apache Hive. Future work for HCatalog may include stable integration with HBase, fixing bugs in the API/public interface, and single connection to Hive-HCatalog with more Hive metadata access if adopted as part of Hive project.

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