Initially taken from here:
As Cloudera site is no longer used:
Sqoop currently supports bulk export from PostgreSQL but not bulk import. PostgreSQL support COPY <table> FROM <filename> syntax and readily accepts CSV data. We should support this so there is --direct support in both directions.
A note from myself:
the pg_bulkupload feature is already implemented:
pg_builupload is a third-party tool, I guess supporting COPY would be a better case.