1 What is Hive?

Hive is a data warehouse software which is used for facilitates querying and managing large data sets residing in distributed storage.

Hive language almost look like SQL language called HiveQL. Hive also allows traditional map reduce programs to customize mappers and reducers when it is inconvenient or inefficient to execute the logic in HiveQL (User Defined Functions UDFS)

2 What is Hive Metastore?

Hive metastore is a database that stores metadata about your Hive tables (eg. Table name, column names and types,table location, storage handler being used, number of buckets in the table, sorting columns if any, partition columns if any, etc.).

When you create a table,this metastore gets updated with the information related to the new table which gets queried when you issue queries on that table.

Hive is a central repository of hive metadata. it has 2 parts services and data. by default it uses derby db in local disk. it is referred as embedded metastore configuration. It tends to the limitation that only one session can be served at any given point of time.

3 Which classes are used by the Hive to Read and Write HDFS Files?

Following classes are used by Hive to read and write HDFS files

•TextInputFormat/HiveIgnoreKeyTextOutputFormat: These 2 classes read/write data in plain text file format.
•SequenceFileInputFormat/SequenceFileOutputFormat: These 2 classes read/write data in hadoop SequenceFile format.

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