[jira] Commented: (MAPREDUCE-1224) Calling "SELECT t.* from AS t" to get meta information is too expensive for big tables

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1224?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12796710#action_12796710 ] 

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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