C. Map existing HBase tables to Hive
This is the third step to integrate HCL® Campaign with Hive-based Apache Hadoop data sources. If you do not have existing tables that were created in Apache HBase, you can skip this step.
Before you begin
About this task
This step is required only if you have existing tables that were created in Apache HBase. In this case, you must make the existing HBase tables available to Apache Hive by running the CREATE EXTERNAL TABLE query. After you expose the HBase tables to Hive, the tables are then available to IBM Campaign for table mapping within Campaign.
The EXTERNAL keyword lets you create a table and provide a LOCATION so that Hive does not use a default location for the table. This is useful if you already have data generated. An EXTERNAL table points to any HDFS location for its storage, rather than being stored in a folder specified by the configuration property. When dropping an EXTERNAL table, data in the table is NOT deleted from the file system.
For information about Hive HBase integration: https://cwiki.apache.org/confluence/display/Hive/HBaseIntegration