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What is the use of HCatalog?

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Hadoop provides a table and storage management  layer called HCatalog. With HCatalog users in Hive can use different data processing tools like- Pig, MapReduce, Hive, Streaming etc to read and write data on the grid.

With HCatalog we can read and write files in any format for which SerDe is available.  Default options supported by HCatalog are: RCFile, CSV, JSON and

 

SequenceFile.

In HCatalog we can see the data in a relational view.

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