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From "Hari Sekhon (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SQOOP-1055) Add Sqoop export --query option
Date Tue, 21 May 2013 17:07:16 GMT
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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