This Blog describes the java client API for HBase that’s employed to perform CRUD operations on HBase tables. HBase is written in Java and has a Java Native API. Therefore it provides programmatic access to Info Manipulation Language (DML).

Class HBase Configuration

Adds HBase configuration files to a Configuration. This class belongs to the org.apache.hadoop.hbase package.

Methods and outline

S.No.

Methods and Outline

static org.apache.hadoop.conf.Configuration create()

This method creates a Configuration with HBase resources.

Class HTable

HTable is an HBase internal class that represents an HBase table. It is an implementation of table that’s employed to communicate with a single HBase table. This class belongs to the org.apache.hadoop.hbase.client class.

Constructors

S.No.

Constructors and Outline

HTable()

HTable(TableName tableName, ClusterConnection connection, ExecutorService pool)

Using this constructor, you can create an object to access an HBase table.

Methods and outline

S.No.	Methods and Outline
1	void close() Releases all the resources of the HTable.
2	void delete(Delete delete) Deletes the required cells/row.
3	boolean exists(Get get) Using this method, you can test the existence of columns in the table, as required by Get.
4	Result get(Get get) Retrieves certain cells from a given row.
5	org.apache.hadoop.conf.Configuration getConfiguration() Returns the Configuration object employed by this instance.
6	TableName getName() Returns the table name instance of this table.
7	HTableDescriptor getTableDescriptor() Returns the table descriptor for this table.
8	byte[] getTableName() Returns the name of this table.
9	void put(Put put) Using this method, you can insert info into the table.

Class Put

This class is employed to perform Put operations for a single row. It belongs to the org.apache.hadoop.hbase.client package.

Constructors

S.No.	Constructors and Outline
1	Put(byte[] row) Using this constructor, you can create a Put operation for the required row.
2	Put(byte[] rowArray, int rowOffset, int rowLength) Using this constructor, you can make a copy of the passed-in row key to keep local.
3	Put(byte[] rowArray, int rowOffset, int rowLength, long ts) Using this constructor, you can make a copy of the passed-in row key to keep local.
4	Put(byte[] row, long ts) Using this constructor, we can create a Put operation for the required row, using a given timestamp.

Methods

S.No.	Methods and Outline
1	Put add(byte[] family, byte[] qualifier, byte[] value) Adds the required column and value to this Put operation.
2	Put add(byte[] family, byte[] qualifier, long ts, byte[] value) Adds the required column and value, with the required timestamp as its version to this Put operation.
3	Put add(byte[] family, ByteBuffer qualifier, long ts, ByteBuffer value) Adds the required column and value, with the required timestamp as its version to this Put operation.
4	Put add(byte[] family, ByteBuffer qualifier, long ts, ByteBuffer value) Adds the required column and value, with the required timestamp as its version to this Put operation.

Class Get

This class is employed to perform Get operations on a single row. This class belongs to the org.apache.hadoop.hbase.client package.

Constructor

S.No.

Constructor and Outline

Get(byte[] row)

Using this constructor, you can create a Get operation for the required row.

Get(Get get)

Methods

S.No.

Methods and Outline

Get addColumn(byte[] family, byte[] qualifier)

Retrieves the column from the specific family with the required qualifier.

Get addFamily(byte[] family)

Retrieves all columns from the required family.

Class Delete

This class is employed to perform Delete operations on a single row. To delete an entire row, instantiate a Delete object with the row to delete. This class belongs to the org.apache.hadoop.hbase.client package.

Constructor

S.No.	Constructor and Outline
1	Delete(byte[] row) Creates a Delete operation for the required row.
2	Delete(byte[] rowArray, int rowOffset, int rowLength) Creates a Delete operation for the required row and timestamp.
3	Delete(byte[] rowArray, int rowOffset, int rowLength, long ts) Creates a Delete operation for the required row and timestamp.
4	Delete(byte[] row, long timestamp) Creates a Delete operation for the required row and timestamp.

Methods

S.No.	Methods and Outline
1	Delete addColumn(byte[] family, byte[] qualifier) Deletes the latest version of the required column.
2	Delete addColumns(byte[] family, byte[] qualifier, long timestamp) Deletes all versions of the required column with a timestamp less than or equal to the required timestamp.
3	Delete addFamily(byte[] family) Deletes all versions of all columns of the required family.
4	Delete addFamily(byte[] family, long timestamp) Deletes all columns of the required family with a timestamp less than or equal to the required timestamp.

Class Result

This class is employed to get a one row result of a Get or a Scan query.

Constructors

S.No.

Constructors

Result()

Using this constructor, you’ll create an empty Result with no KeyValue payload; returns null if you call raw Cells().

Methods

S.No.

Methods and Outline

byte[] getValue(byte[] family, byte[] qualifier)

This method is employed to get the latest version of the required column.

byte[] getRow()

This method is employed to urge the row key that corresponds to the row from which this Result was created.

So, this brings us to the end of blog. This Tecklearn ‘Deep dive into Java Client API for HBase and its associated classes’ 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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Components of HBase Cluster

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Create an Eclipse Project for HBase
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