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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.
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    HBase and RDBMS :

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