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https://issues.apache.org/jira/browse/MAPREDUCE-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796710#action_12796710
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Hudson commented on MAPREDUCE-1224:
-----------------------------------
Integrated in Hadoop-Mapreduce-trunk #196 (See
[http://hudson.zones.apache.org/hudson/job/Hadoop-Mapreduce-trunk/196/])
> Calling "SELECT t.* from <table> AS t" to get meta information is too
> expensive for big tables
> ----------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1224
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1224
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: contrib/sqoop
> Affects Versions: 0.20.1
> Environment: all platforms, generic jdbc driver
> Reporter: Spencer Ho
> Assignee: Spencer Ho
> Fix For: 0.22.0
>
> Attachments: MAPREDUCE-1224.patch, SqlManager.java
>
>
> 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.
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