<rdbms-jdbc-url>// RDBMS JDBC URL
<username>// Username of the RDBMS database
<password>// Password of the RDBMS database
<table-name>// RDBMS database table
<hdfs-home-dir>// HDFS home directory
<condition>// Condition that can be expressed in the form of a SQL query with a WHERE clause.
<sql-query>// SQL Query
<target-dir>// HDFS Target Directory
Sqoop is a Hadoop Command Line tool that imports table from an RDBMS data source to HDFS and vice versa. It generates a Java class which allows us to interact with the imported data. Each row from a table is saved as a separate record in HDFS. Records can be stored as text files or in binary representation as Avro or Sequence Files. There are 2 versions of sqoop :
Sqoop1 and Sqoop2
Sqoop1 is the widely accepted tool and is recommended for production environments. Find the comparison between Sqoop1 and Sqoop2 as stated on Cloudera's website.