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sqoop import to hbase

HBase is a distributed column-oriented database built on top of the Hadoop file system.

It is an open-source project and is horizontally scalable.

HBase is a data model that is similar to Google’s big table designed to provide quick random access to huge amounts of structured data.

It leverages the fault tolerance provided by the Hadoop File System (HDFS).

It is a part of the Hadoop ecosystem that provides random real-time read/write access to data in the Hadoop File System.

Storage Mechanism in HBase

HBase is a column-oriented database and the tables in it are sorted by row.

The table schema defines only column families, which are the key value pairs.

A table have multiple column families and each column family can have any number of columns.

Subsequent column values are stored contiguously on the disk.

Each cell value of the table has a timestamp. In short, in an HBase:

Table is a collection of rows.
Row is a collection of column families.
Column family is a collection of columns.
Column is a collection of key value pairs.

Column Oriented and Row Oriented :

Column-oriented databases are those that store data tables as sections of columns of data, rather than as rows of data.

HBase and RDBMS :

Sqoop HBase Intro :

Sqoop supports additional import targets beyond HDFS and Hive.

Sqoop can also import records into a table in HBase.

Sqoop will import data to the table specified as the argument to --hbase-table .

Each row of the input table will be transformed into an HBase Put operation to a row of the output table. The key for each row is taken from a column of the input.

By default Sqoop will use the split-by column as the row key column. If that is not specified, it will try to identify the primary key column, if any, of the source table.

You can manually specify the row key column with --hbase-row-key.

Each output column will be placed in the same column family, which must be specified with --column-family.

If the input table has composite key, the --hbase-row-key must be in the form of a comma-separated list of composite key attributes.

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In this case, the row key for HBase row will be generated by combining values of composite key attributes using underscore as a separator.

NOTE: Sqoop import for a table with composite key will work only if parameter --hbase-row-key has been specified. If the target table and column family do not exist, the Sqoop job will exit with an error.

You should create the target table and column family before running an import.

If you specify --hbase-create-table, Sqoop will create the target table and column family if they do not exist, using the default parameters from your HBase configuration.

 sqoop import  \
--connect  <<jdbc-uri>> \
--table <<table-name>> \
--hbase-table <<hbase list name>>\
--hbase-row-key <<table primary key or unique key column>>\
--column-family metadata \
--hbase-create-table \
--username root -P

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sqoop import \
--connect "jdbc:mysql://localhost/retail_db" \
--username root -P \
--table customers \
--columns customer_id,customer_fname,customer_lname,customer_city,customer_state \
--hbase-create-table \
--hbase-table retailtbl \
--column-family customerInfo \
--hbase-row-key customer_id

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sqoop import to hbase

Storage Mechanism in HBase

Column Oriented and Row Oriented :

HBase and RDBMS :

Sqoop HBase Intro :

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Click "Copy code" button to copy into clipboard - By wikitechy - sqoop tutorial - team

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sqoop - sqoop import to hbase - apache sqoop - sqoop tutorial - sqoop hadoop

sqoop import to hbase

Storage Mechanism in HBase

Column Oriented and Row Oriented :

HBase and RDBMS :

Sqoop HBase Intro :

Click "Copy code" button to copy into clipboard - By wikitechy - sqoop tutorial - team

Click "Copy code" button to copy into clipboard - By wikitechy - sqoop tutorial - team

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