Primary Key Error while importing table Using Sqoop - import

Question

I tried to import all tables using the sqoop into one of the directories.But one of the tables has no primary key.This is the code I executed.
sqoop import-all-tables --connect "jdbc:mysql://quickstart.cloudera/retail_db"
--username=retail_dba
--password=cloudera
--warehouse-dir /user/cloudera/sqoop_import/
I am getting the following error:
Error during import: No primary key could be found for table
departments_export. Please specify one with --split-by or perform a
sequential import with '-m 1'.
By seeing
sqoop import without primary key in RDBMS
I understood that we can just use --split-by for a single table import.Is there a way i can specify --splity-by for Import-all-tables command. Is there a way I can use more than one mapper for the multi-table import with no primary-key.

Answer 1

you need to use --autoreset-to-one-mapper:
Tables without primary key will be imported with one mapper and others with primary key with default mappers (4 - if not specified in sqoop command)
As #JaimeCr said you can't use --split-by with import-all-tables but this just a quote from sqoop guide in context of error you got:
If a table does not have a primary key defined and the --split-by> <col> is not provided, then import will fail unless the number of mappers is explicitly set to one with the --num-mappers 1 or --m 1 option or the --autoreset-to-one-mapper option is used.
The option --autoreset-to-one-mapper is typically used with the import-all-tables tool to automatically handle tables without a primary key in a schema.
sqoop import-all-tables --connect "jdbc:mysql://quickstart.cloudera/retail_db" \
--username=retail_dba \
--password=cloudera \
--autoreset-to-one-mapper \
--warehouse-dir /user/cloudera/sqoop_import/