Details
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Improvement
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Status: Resolved
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Major
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Resolution: Fixed
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0.20.1
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None
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None
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None
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all platforms, generic jdbc driver
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Reviewed
Description
The SqlManager uses the query, "SELECT t.* from <table> AS t" to get table spec is too expensive for big tables, and it was called twice to generate column names and types. For tables that are big enough to be map-reduced, this is too expensive to make sqoop useful.