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Alluxio Structured Data Management is part of the framework for the open-source toolkit. The framework is designed to work with existing Hive Metastore databases. The tool is called Under Database (UDB) and manages connections to external metadata services. In the 2.2 release, there is an implementation of the UDB for the Hive Metastore. In future versions, support for the AWS Glue UDB will be added to the Alluxi catalog. The Alluxie catalog can manage and serve table metadata for structured data.