Listing a Table - Simplified Learning

Listing a Table using HBase Shell

list is the command that is used to list all the tables in HBase. Given below is the syntax of the list command.

hbase> list

When you type this command and execute in HBase prompt, it will display the list of all the tables in HBase as shown below.

hbase> list
TABLE
emp

Listing Tables Using Java API

We have a method called listTables() in the class HBaseAdmin to get the list of all the tables in HBase. This method returns an array of HTableDescriptor objects.

package com.ashok.hbase;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.MasterNotRunningException;
import org.apache.hadoop.hbase.client.HBaseAdmin;

/**
 * 
 * @author ashok.mariyala
 *
 */
public class ListTables {
   public static void main(String args[])throws MasterNotRunningException, IOException{

      // Instantiating a configuration class
      Configuration conf = HBaseConfiguration.create();

      // Instantiating HBaseAdmin class
      HBaseAdmin admin = new HBaseAdmin(conf);

      // Getting all the list of tables using HBaseAdmin object
      HTableDescriptor[] tableDescriptor = admin.listTables();

      // printing all the table names.
      for (int i=0; i<tableDescriptor.length;i++ ){
         System.out.println(tableDescriptor[i].getNameAsString());
      }
   }
}

Listing a Table