Java creates a table in the HBase Database

To create a data table in HBase through Java, you first need to import the hbase-client.jar driver package. You can add dependencies in the project pom. xml configuration file:

To create a data table in HBase through Java, you first need to import the hbase-client.jar driver package. You can add dependencies in the project pom. xml configuration file:

To create a data table in HBase through Java, you first need to import the hbase-client.jar driver package. You can add dependencies in the project pom. xml configuration file:

Org. apache. hbase Hbase-client 1.1.0.1

After adding dependencies, we need to create the Configuration object and specify the core-site.xml and hbase-site.xml as the resource file.

Configuration config = HBaseConfiguration. create (); config. addResource (new Path ("/etc/hbase/conf/hbase-site.xml"); config. addResource (new Path ("/etc/Hadoop/conf/core-site.xml "));

You also need to set the values of the hbase. zookeeper. quorum parameter and the hbase. zookeeper. property. clientPort parameter in the Configuration object, which can also be found in the hbase-site.xml Configuration file:

Configuration config = HBaseConfiguration. create (); config. set ("hbase. zookeeper. quorum "," 127.0.0.1 "); config. set ("hbase. zookeeper. property. clientPort "," 2181 ");

After the Configuration object is created, create a Connection object connected to the HBase database and obtain the Admin object through this object. It is responsible for creating data tables:

Connection connection = ConnectionFactory. createConnection (config); Admin admin Admin = connection. getAdmin ();

Once an Admin object is created, you can use the following code to create a data table:

String tableName = "users"; if (! Admin. isTableAvailable (TableName. valueOf (tableName) {HTableDescriptor hbaseTable = new HTableDescriptor (TableName. valueOf (tableName); hbaseTable. addFamily (new HColumnDescriptor ("name"); hbaseTable. addFamily (new HColumnDescriptor ("contact_info"); hbaseTable. addFamily (new HColumnDescriptor ("personal_info"); admin. createTable (hbaseTable );}

Whether a data table with the "users" name exists. If the table does not exist, a new table is created. The column name includes the family name, contact information, and personal information.

The complete procedure is as follows:

Package com. wordpress. khodeprasad; import org. apache. hadoop. conf. configuration; import org. apache. hadoop. hbase. HBaseConfiguration; import org. apache. hadoop. hbase. HColumnDescriptor; import org. apache. hadoop. hbase. HTableDescriptor; import org. apache. hadoop. hbase. tableName; import org. apache. hadoop. hbase. client. admin; import org. apache. hadoop. hbase. client. connection; import org. apache. hadoop. hbase. client. conn EctionFactory;/*** @ author Prasad Khode ***/public class CreateTable {public static void main (String [] args) {CreateTable object = new CreateTable (); object. createTable ();} public void createTable () {Configuration config = HBaseConfiguration. create (); config. set ("hbase. zookeeper. quorum "," 127.0.0.1 "); config. set ("hbase. zookeeper. property. clientPort "," 2181 "); Connection connection = null; Admin admin = nu Ll; try {connection = ConnectionFactory. createConnection (config); admin = connection. getAdmin (); String tableName = "users"; if (! Admin. isTableAvailable (TableName. valueOf (tableName) {HTableDescriptor hbaseTable = new HTableDescriptor (TableName. valueOf (tableName); hbaseTable. addFamily (new HColumnDescriptor ("name"); hbaseTable. addFamily (new HColumnDescriptor ("contact_info"); hbaseTable. addFamily (new HColumnDescriptor ("personal_info"); admin. createTable (hbaseTable);} catch (Exception e) {e. printStackTrace ();} finally {try {if (Admin! = Null) {admin. close () ;}if (connection! = Null &&! Connection. isClosed () {connection. close () ;}} catch (Exception e2) {e2.printStackTrace ();}}}}

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