You can delete data from an HBase table using the delete() method of the HTable class. Follow the steps given below to delete data from a table.

Step 1: Instantiate the Configuration Class

Configuration class adds HBase configuration files to its object. You can create a configuration object using the create() method of the the HbaseConfiguration class as shown below.

Configuration conf = HbaseConfiguration.create();

Step 2: Instantiate the HTable Class

You have a class called HTable, an implementation of Table in HBase. This class is employed to communicate with a single HBase table. While instantiating this class, it accepts the configuration object and the table name as parameters. You can instantiate the HTable class as shown below.

HTable hTable = new HTable(conf, tableName);

Step 3: Instantiate the Delete Class

Instantiate the Delete class by passing the rowid of the row that is to be deleted, in byte array format. You can also pass timestamp and Rowlock to this constructor.

Delete delete = new Delete(toBytes(“row1”));

Step 4: Select the Data to be Deleted

You can delete the data using the delete methods of the Delete class. This class has various delete methods. Choose the columns or column families to be deleted using those methods. Take a look at the subsequent examples that show the usage of Delete class methods.

delete.deleteColumn(Bytes.toBytes(“personal”), Bytes.toBytes(“name”));

delete.deleteFamily(Bytes.toBytes(“professional”));

Step 5: Delete the Data

Delete the selected data by passing the delete instance to the delete() method of the HTable class as shown below.

table.delete(delete);

Step 6: Close the HTableInstance

After deleting the data, close the HTable Instance.

table.close();

Given below is the complete program to delete data from the HBase table.

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;

import org.apache.hadoop.hbase.HBaseConfiguration;

import org.apache.hadoop.hbase.client.Delete;

import org.apache.hadoop.hbase.client.HTable;

import org.apache.hadoop.hbase.util.Bytes;

public class DeleteData {

public static void main(String[] args) throws IOException {

// Instantiating Configuration class

Configuration conf = HBaseConfiguration.create();

// Instantiating HTable class

HTable table = new HTable(conf, “employee”);

// Instantiating Delete class

Delete delete = new Delete(Bytes.toBytes(“row1”));

delete.deleteColumn(Bytes.toBytes(“personal”), Bytes.toBytes(“name”));

delete.deleteFamily(Bytes.toBytes(“professional”));

// deleting the data

table.delete(delete);

// closing the HTable object

table.close();

System.out.println(“data deleted…..”);

}

Compile and execute the above program as shown below.

$javac Deletedata.java

$java DeleteData

The subsequent should be the output:

data deleted

So, this brings us to the end of blog. This Tecklearn ‘How to delete data in Table in HBase’ helps you with commonly asked questions if you are looking out for a job in HBase and No-SQL Database Domain.

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