Daniel Voros created SQOOP-3311:
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Summary: Importing as ORC file to support full ACID Hive tables
Key: SQOOP-3311
URL: https://issues.apache.org/jira/browse/SQOOP-3311
Project: Sqoop
Issue Type: New Feature
Components: hive-integration
Reporter: Daniel Voros
Assignee: Daniel Voros
Hive 3 will introduce a switch (HIVE-18294) to create eligible tables as ACID
by default. This will probably result in increased usage of ACID tables and the
need to support importing into ACID tables with Sqoop.
Currently the only table format supporting full ACID tables is ORC.
The easiest and most effective way to support importing into these tables would
be to write out files as ORC and keep using LOAD DATA as we do for all other
Hive tables (supported since HIVE-17361).
Workaround could be to create table as textfile (as before) and then CTAS from
that. This would push the responsibility of creating ORC format to Hive.
However it would result in writing every record twice; in text format and in
ORC.
Note that ORC is only necessary for full ACID tables. Insert-only (aka.
micromanaged) ACID tables can use arbitrary file format.
Supporting full ACID tables would also be the first step in making
"lastmodified" incremental imports work with Hive.
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