Metastore is used to store the metadata information; it’s also possible to use RDBMS and the open-source ORM layer, converting object Representation into a relational schema. It’s the central repository of Apache Hive metadata. It stores metadata for Hive tables (similar to their schema and location) and partitions in a relational database. It gives the client access to this information by using metastore service API. Disk storage for the Hive metadata is separate from HDFS storage.
