This chapter describes how to create and maintain the Sqoop jobs. Sqoop job creates and saves the import and export commands. It specifies parameters to identify and recall the saved job. This re-calling or re-executing is used in the incremental import, which can import the updated rows from RDBMS table to HDFS.
The following is the syntax for creating a Sqoop job.
$ sqoop job (generic-args) (job-args) [-- [subtool-name] (subtool-args)] $ sqoop-job (generic-args) (job-args) [-- [subtool-name] (subtool-args)]
Here we are creating a job with the name myjob, which can import the table data from RDBMS table to HDFS. The following command is used to create a job that is importing data from the employee table in the db database to the HDFS file.
$ sqoop job --create myjob \ -- import \ --connect jdbc:mysql://localhost/db \ --username root \ --table employee --m 1
‘--list’ argument is used to verify the saved jobs. The following command is used to verify the list of saved Sqoop jobs.
$ sqoop job --list
It shows the list of saved jobs.
Available jobs: myjob
‘--show’ argument is used to inspect or verify particular jobs and their details. The following command and sample output is used to verify a job called myjob.
$ sqoop job --show myjob
It shows the tools and their options, which are used in myjob.
Job: myjob Tool: import Options: ---------------------------- direct.import = true codegen.input.delimiters.record = 0 hdfs.append.dir = false db.table = employee ... incremental.last.value = 1206 ...
‘--exec’ option is used to execute a saved job. The following command is used to execute a saved job called myjob.
$ sqoop job --exec myjob
It shows you the following output.
10/08/19 13:08:45 INFO tool.CodeGenTool: Beginning code generation ...