Hive not only provides a connection for data querying but also can map its external table to a NoSQL database, such as HBase or MongoDB, with various storage handlers.
To map an existing table in HBase, Hive uses the HBaseStorageHandler class in the table-creation statement. An example of creating a Hive external table mapping to an existing HBase is as follows:
> CREATE TABLE hbase_table_sample(
> id int,
> value1 string,
> value2 string,
> map_value map<string, string>
> )
> STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
> WITH SERDEPROPERTIES ("hbase.columns.mapping" = ":key,cf1:val,cf2:val,cf3")
> TBLPROPERTIES ("hbase.table.name" = "table_name_in_hbase");
In this special CREATE TABLE statement, the HBaseStorageHandler class is delegating interaction with the HBase table...