Create HBase External Tables Using Hive

1 year ago
Ava Mitchell
2 minutes

The following steps are required to create an external table in HBase.

  1. Create a Hive table to define the structure of an external table. You can use the CREATE EXTERNAL TABLE statement to create the external table, specifying the table name and column families for storing HBase data.

For example, create an external table named my_external_table that stores data from an HBase table named hbase_table, with the column family cf1.

CREATE EXTERNAL TABLE my_external_table (
    id INT,
    name STRING,
    age INT
)
STORED BY 'org.apache.hadoop.hive.hbase.HBaseStorageHandler'
WITH SERDEPROPERTIES ('hbase.columns.mapping' = ':key,cf1:name,cf1:age')
TBLPROPERTIES ('hbase.table.name' = 'hbase_table');
  1. Add the HBase storage handler to the classpath of Hive. You can add the following configuration in the Hive configuration file hive-site.xml.
<property>
    <name>hive.aux.jars.path</name>
    <value>/path/to/hbase-handler.jar</value>
</property>

Be sure to replace /path/to/hbase-handler.jar with the actual path to the HBase handler jar file.

  1. Querying an external table in Hive. Once the external table is created, it can be used like any other Hive table for querying. For example, you can use a SELECT statement to query the data in the external table.
SELECT * FROM my_external_table;

注意在创建HBase外部表时，要确保HBase和Hive之间的连接和配置是正确的。

bannerAds