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Apache HCatalog =============== HCatalog is a table and storage management service for data created using Apache Hadoop. The vision of HCatalog is to provide table management and storage management layers for Apache Hadoop. This includes: * Providing a shared schema and data type mechanism. * Providing a table abstraction so that users need not be concerned with where or how their data is stored. * Providing interoperability across data processing tools such as Pig, Map Reduce, Streaming, and Hive. Data processors using Apache Hadoop have a common need for table management services. The goal of this table management service is to track data that exists in a Hadoop grid and present that data to users in a tabular format. HCatalog provides a single input and output format to users so that individual users need not be concerned with the storage formats that are chosen for particular data sets. Data is described by a schema and shares a datatype system. Users are free to choose the best tools for their use cases. The Hadoop project includes Map Reduce, Streaming, Pig, and Hive, and additional tools exist such as Cascading. Each of these tools has users who prefer it, and there are use cases best addressed by each of these tools. Two users on the same grid who share data are not constrained to use the same tool but with HCatalog are free to choose the best tool for their use case. HCatalog presents data in the same way to all of the tools, providing interfaces to each of them. For the latest information about HCatalog, please visit our website at: http://incubator.apache.org/hcatalog and our wiki, at: https://cwiki.apache.org/confluence/display/HCATALOG