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Posted to dev@sqoop.apache.org by "Hari Sekhon (JIRA)" <ji...@apache.org> on 2013/05/21 19:07:16 UTC
[jira] [Created] (SQOOP-1055) Add Sqoop export --query option
Hari Sekhon created SQOOP-1055:
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Summary: Add Sqoop export --query option
Key: SQOOP-1055
URL: https://issues.apache.org/jira/browse/SQOOP-1055
Project: Sqoop
Issue Type: Improvement
Reporter: Hari Sekhon
Sqoop currently has a --query option for import but not for export.
It would be nice if the export --query option supporting HiveQL could be added as users currently have to create a temporary table and then export that as a two step process with a full disk re-write of all the to-be-exported data to a new table before the sqoop export command is started.
Since Sqoop executes a distributed map-only job, I believe certain queries such as joins that have to be done via a reduce phase will yield little performance improvement due to the map->reduce intermediate writes needing to be written anyway. However we could save on the final reduce phase writes and also turn this in to a more convenient one step instead two step process.
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